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Micromorphological Analysis of Soil Structure under No Tillage Management in the Black Soil Zone of Northeast China 认领 引用 被引量：8
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作者 ZHOU Hu LI Baoguo LU Yizhong 《Journal of Mountain Science》 SCIE 2009年第2期173-180,共8页
The structure of the"black soil"in Northeast China has been greatly deteriorated by long-term intensive conventional mouldboard plow tillage(CT)practices.In this study,micro-morphological observation and ima... The structure of the"black soil"in Northeast China has been greatly deteriorated by long-term intensive conventional mouldboard plow tillage(CT)practices.In this study,micro-morphological observation and image analysis of soil thin sections were conducted to evaluate the impacts of 21 years(1986-2007)of no tillage(NT)on soil structure as compared to CT in an experiment near Gongzhuling City,Jilin Province.Soil organic matter(SOM),wet aggregate stability and saturated hydraulic conductivity(Ks)were also analyzed.Total SOM was not significantly affected by tillage systems,but fresher SOM was observed in the surface layer under NT.The aggregates under NT showed different hierarchies in the form of crumbs,and the mean weight diameter(MWD)of NT was significant higher than that of CT in the surface layer.Platy and blocky aggregates were frequently observed in the lower layers under CT practice.The compound pore structure with intertwined intra-and inter-aggregates pores under NT was well developed in a layer from 0-5 cm to 20-25 era.While under CT system,more inter-aggregate pores and fewer intra-aggregate pores were observed,and planes and channels were frequently found in the 20-25 cm layer,where maeroporosity decreased significantly and a plow pan was evident.The Ks values of NT weresignificantly lower at o-5 cm but significantly higher at 20-95 cm compared with CT,which showed the same trend with macroporosity.These results confirmed that long-term CT practice fragmented the tillage layer soil and compacted the lower layer soil and formed a plow pan.While long-term NT practice in the black soil region favored soil aggregation and a stable porous soil structure was formed,which are important to the water infiltration and prevent soil erosion. 展开更多
关键词 No tillage soil structure soilmicromorphology image analysis black soil
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Synergistic combination of arbuscular mycorrhizal fungi and plant growth-promoting rhizobacteria modulates morpho-physiological characteristics and soil structure in Nitraria tangutorum bobr.Under saline soil conditions 认领 引用 被引量：6
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作者 Jing Pan CuiHua Huang +5 位作者 Fei Peng Tao Wang Jie Liao ShaoXiu Ma QuanGang You Xian Xue 《Research in Cold and Arid Regions》 CSCD 2022年第6期393-402,共10页
Nitraria tangutorum Bobr.,a typical xero-halophyte,can be used for vegetation restoration and reconstruction in arid and semiarid regions affected by salinity.However,global climate change and unreasonable human activ... Nitraria tangutorum Bobr.,a typical xero-halophyte,can be used for vegetation restoration and reconstruction in arid and semiarid regions affected by salinity.However,global climate change and unreasonable human activity have exacerbated salinization in arid and semi-arid regions,which in turn has led to the growth inhibition of halophytes,including N.tangutorum.Arbuscular mycorrhizal fungi(AMF)and plant growth-promoting rhizobacteria(PGPR)have the potential to improve the salt tolerance of plants and their adaptation to saline soil environments.In this study,the effects of single and combined inoculations of AMF(Glomus mosseae)and PGPR(Bacillus amyloliquefaciens FZB42)on N.tangutorum were evaluated in severe saline soil conditions.The results indicate that AMF and PGPR alone may not adapt well to the real soil environment,and cannot ensure the effect of either growth promotion or salt-tolerance induction on N.tangutorum seedlings.However,the combination of AMF and PGPR significantly promoted mycorrhizal colonization,increased biomass accumulation,improved morphological development,enhanced photosynthetic performance,stomatal adjustment ability,and the exchange of water and gas.Co-inoculation also significantly counteracted the adverse effect of salinity on the soil structure of N.tangutorum seedlings.It is concluded that the effectiveness of microbial inoculation on the salt tolerance of N.tangutorum seedlings depends on the functional compatibility between plants and microorganisms as well as the specific combinations of AMF and PGPR. 展开更多
关键词 Nitraria tangutorum Bobr. Arbuscular mycorrhizal fungi Plant growth-promoting rhizobacteria Morphological development Photosynthesis physiology Soil structure
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Quantitatively characterizing sandy soil structure altered by MICP using multi-level thresholding segmentation algorithm 认领 引用 被引量：3
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作者 Jianjun Zi Tao Liu +3 位作者 Wei Zhang Xiaohua Pan Hu Ji Honghu Zhu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第10期4285-4299,共15页
The influences of biological,chemical,and flow processes on soil structure through microbially induced carbonate precipitation(MICP)are not yet fully understood.In this study,we use a multi-level thresholding segmenta... The influences of biological,chemical,and flow processes on soil structure through microbially induced carbonate precipitation(MICP)are not yet fully understood.In this study,we use a multi-level thresholding segmentation algorithm,genetic algorithm(GA)enhanced Kapur entropy(KE)(GAE-KE),to accomplish quantitative characterization of sandy soil structure altered by MICP cementation.A sandy soil sample was treated using MICP method and scanned by the synchrotron radiation(SR)micro-CT with a resolution of 6.5 mm.After validation,tri-level thresholding segmentation using GAE-KE successfully separated the precipitated calcium carbonate crystals from sand particles and pores.The spatial distributions of porosity,pore structure parameters,and flow characteristics were calculated for quantitative characterization.The results offer pore-scale insights into the MICP treatment effect,and the quantitative understanding confirms the feasibility of the GAE-KE multi-level thresholding segmentation algorithm. 展开更多
关键词 Soil structure Micro-CT Multi-level thresholding MICP Genetic algorithm(GA)
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Effects of different concentrations of super-absorbent polymers on soil structure and hydro-physical properties following continuous wetting and drying cycles 认领 引用 被引量：1
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作者 JI Bing-yi ZHAO Chi-peng +3 位作者 WU Yue HAN Wei SONG Ji-qing BAI Wen-bo 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2022年第11期3368-3381,共14页
Super-absorbent polymers(SAPs)are widely used chemical water-saving materials,which play an active role in the accumulation of soil water and the improvement of soil structure.Little is known about their performance w... Super-absorbent polymers(SAPs)are widely used chemical water-saving materials,which play an active role in the accumulation of soil water and the improvement of soil structure.Little is known about their performance with repeated usage or about factors influencing their efficiency under alternate wetting and drying cycles.In this study,various concentrations of SAP(0,0.1,0.2 and 0.3%)in soil following three continuous wetting and drying cycles(T1,T2 and T3),were studied to determine effects on soil structure stability and hydro-physical properties.The results indicated that the SAP improved soil water supply capacity under conditions of mild drought(T2)and sufficient irrigation(T3)at concentrations of 0.2 and 0.3%,but a reduction was observed under severe drought conditions(T1),which was negatively correlated with the SAP concentration.The physical adsorption of the SAP by soil and the chemical connection between the SAP and soil mineral colloids as Si-O-Si bonds,-OH bonds and different crystalline silica were the important factors that directly lead to the reduction of water retention capacities of the SAP with alternating wet and dry conditions.Compared with the control,the soil liquid phase ratios of the SAP treatments were increased by8.8-202.7%in the T1 and T2 cycles,which would have led to a decrease in the soil air phase ratios.After repeated wetting and drying cycles,the SAP treatments increased the amount of>0.25 mm soil aggregates and the contents of water-stable macro-aggregate(R0.25),and decreased the amount of<0.053 mm soil aggregates,especially with higher concentrations of the SAP.Increases in mean weight diameter(MWD)and geometric mean diameter(GMD),and declines in fractal dimension(D)and unstable aggregates index(ELT)were all observed with the SAP treatments,which indicated an improvement in soil stability and structure.It was concluded that the distribution and stability of soil aggregates and soil water supply capacity was closely related to SAP concentration,soil moisture condition and the interaction between the SAP and soil particles. 展开更多
关键词 super-absorbent polymer(SAP) soil water soil structure soil aggregate soil colloid
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Dynamic Study on Water Stability of Soil Structure and Soil Characteristics of Several Types of Soils in Southwest China 认领 引用 被引量：2
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作者 SHEN Nan HE Yurong XU Xiangming 《Wuhan University Journal of Natural Sciences》 CAS 2008年第3期336-342,共7页
Three suborder soils in southwest China were adopted, namely Ustic Vertisol, Stagnic Anthrosol and Ustic Ferrosol, so as to carry out the basic physical and chemical analysis respectively, to design a dynamic measurin... Three suborder soils in southwest China were adopted, namely Ustic Vertisol, Stagnic Anthrosol and Ustic Ferrosol, so as to carry out the basic physical and chemical analysis respectively, to design a dynamic measuring method for water stability of soil structure and conduct the comparative study on the quality of the soil structure. The results indicated that （1） The water stability dynamic characteristic of the soil structure could well reflect the maintaining capability of the soil structure as time goes on. （2） The quality of several soil structures in southwest China was sequenced as follows： Stagnic Anthrosols 〉 Ustic Vertisols 〉 Ustic Ferrosols. （3） The water stability of soil structure is very positively correlated with the capillary porosity and the clay particle （D 〈 0.002 mm） content （Co）, but is very negatively correlated with the silt （D is 0.05-0.002 ram） content （Csc）, and （4） The dynamic functional equation of the water stability of soil structure in southwest China was established, so that the water stability characteristics of various soil structures could be quantitatively expressed and the quality of different soil structures can be quantitatively compared from each other. 展开更多
关键词 soil structure dynamic water stability soil erosion
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Influence of spiral anchor composite foundation on seismic vulnerability of raw soil structure 认领 引用 被引量：1
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作者 Shiwei Hou Guangliang Gao +2 位作者 Hao Zhang Zhanwen Lai Junyan Han 《Earthquake Research Advances》 CSCD 2022年第4期79-85,共7页
A typical single-layer raw soil structure in villages and towns in China is taken as the research object.In the probabilistic seismic demand analysis,the seismic demand model is obtained by the incremental dynamic tim... A typical single-layer raw soil structure in villages and towns in China is taken as the research object.In the probabilistic seismic demand analysis,the seismic demand model is obtained by the incremental dynamic time history analysis method.The seismic vulnerability analysis is carried out for the raw soil structure of nonfoundation,strip foundation,and spiral anchor composite foundation,respectively.The spiral anchor composite foundation can reduce the seismic response and failure state of raw soil structure,and the performance level of the structure is significantly improved.Structural requirements sample data with the same ground motion intensity are analyzed by linear regression statistics.Compared with the probabilistic seismic demand model under various working conditions,the seismic demand increases gradually with the increase of intensity.The seismic vulnerability curve is summarized for comparative analysis.With the gradual deepening of the limit state,the reduction effect of spiral anchor composite foundation on the exceedance probability becomes more and more obvious,which can reduce the probability of structural failure to a certain extent. 展开更多
关键词 Spiral anchor Raw soil structure Probabilistic seismic demand analysis Incremental dynamic time history analysis Seismic vulnerability analysis
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Material Properties and Tensile Behaviors of Polypropylene Geogrid and Geonet for Reinforcement of Soil Structures 认领 引用 被引量：3
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作者 张季如 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2002年第3期83-86,共4页
The properties and tensile behaviors of polypropylene (PP) geogrids and geonets for reinforcement of soil structures are investigated.Mass per unit area of the geogrids and geonets was weighed using an electronic bala... The properties and tensile behaviors of polypropylene (PP) geogrids and geonets for reinforcement of soil structures are investigated.Mass per unit area of the geogrids and geonets was weighed using an electronic balance and aperture sizes of the geonets were exactly measured using a computer.Laboratory tests were performed using a small tensile machine capable of monitoring tensile force and displacement.Tensile failure behaviors were described,and tensile index properties such as tensile strength,maximum tensile strain,tensile forces corresponding to different strains in the geogrids and gronets were obtained.The characterization of these indexes is discussed. 展开更多
关键词 material property tensile behavior polypropylene geogrid geonet reinforcement of soil structure
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A Note on Soil Structure Resistance of Natural Marine Deposits 认领 引用 被引量：5
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作者 洪振舜 刘松玉 刘志方 《海洋工程：英文版》 2004年第2期321-326,共6页
It has been well documented that natural normally-consolidated marine soils are generally subjected to the effects of soil structure. The interpretation of the resistance of soil structure is an important issue in the... It has been well documented that natural normally-consolidated marine soils are generally subjected to the effects of soil structure. The interpretation of the resistance of soil structure is an important issue in the theory study and engineering practice of ocean engineering and geotechnical engineering. It is traditionally considered that the resistance of soil structure gradually disappears with increasing stress level when the applied stress is beyond the consolidation yield stress. In this study, however, it is found that this traditional interpretation of the resistance of soil structure can not explain the strength behavior of natural marine deposits with a normally-consolidated stress history. A new interpretation of the resistance of soil structure is proposed based on the strength behavior. In the preyield state, the undrained strength of natural marine deposits is composed of two components: one developed by the applied stress and the other developed by the resistance of soil structure. When the applied stress is beyond the consolidation yield stress, the strength behavior is independent of the resistance of soil structure. 展开更多
关键词 consolidation yield stress marine clays normally-consolidated stress history postyield state resistance of soil structure strength behavior structured soils
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Identifying soil structure along headwater hillslopes using ground penetrating radar based technique 认领 引用 被引量：9
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作者 HAN Xiao-le LIU Jin-tao +1 位作者 ZHANG Jun ZHANG Zhi-cai 《Journal of Mountain Science》 SCIE CSCD 2016年第3期405-415,共11页
Soil structure plays an important role in understanding soil attributes as well as hydrological processes. Effective method to obtain high quality soil map is therefore important for both soil science research and soi... Soil structure plays an important role in understanding soil attributes as well as hydrological processes. Effective method to obtain high quality soil map is therefore important for both soil science research and soil work ability improvement. However,traditional method such as digging soil pits is destructive and time-consuming. In this study, the structure of headwater hillslopes from Hemuqiao catchment(Taihu Basin, China) have been analyzed both by indirect(ground penetrating radar, GPR) and direct(excavation or soil auger) methods. Four transects at different locations of hillslopes in the catchment were selected for GPR survey. Three of them(#1, #2, and #3) were excavated to obtain fullscale soil information for interpreting radar images.We found that the most distinct boundary that can be detected by GPR is the boundary between soil and underlain bedrock. In some cases(e.g., 8-17 m in transect #2), in which the in situ soil was scarcely affected by colluvial process, different soil layers can be identified. This identification process utilized the sensitive of GPR to capture abrupt changes of soil characteristics in layer boundaries, e.g., surface organic layer(layer #1) and bamboo roots layer(layer#2, contain stone fragments), illuvial deposits layer(layer #3) and regolith layer(layer #4). However, in areas where stone fragments were irregularly distributed in the soil profile(highly affected bycolluvial and/or fluvial process), it was possible to distinguish which part contains more stone fragments in soil profile on the basis of reflection density(transect #3). Transect #4(unexcavated) was used to justify the GPR method for soil survey based on experiences from former transects. After that, O horizon thickness was compared by a hand auger.This work has demonstrated that GPR images can be of a potential data source for hydrological predictions. 展开更多
关键词 Ground Penetrating Radar（GPR） Hillslope Soil structure
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A novel simple procedure to consider seismic soil structure interaction effects in 2D models 认领 引用
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作者 Juan Diego Jaramillo Juan David Gómez +1 位作者 Doriam Restrepo Santiago Rivera 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2014年第3期535-543,共9页
A method is proposed to estimate the seismic soil-structure-interaction （SSI） effects for use in engineering practice. It is applicable to 2D structures subjected to vertically incident shear waves supported by homo... A method is proposed to estimate the seismic soil-structure-interaction （SSI） effects for use in engineering practice. It is applicable to 2D structures subjected to vertically incident shear waves supported by homogenous half-spaces. The method is attractive since it keeps the simplicity of the spectral approach, overcomes some of the difficulties and inaccuracies of existing classical techniques and yet it considers a physically consistent excitation. This level of simplicity is achieved through a response spectra modification factor that can be applied to the free-field 5%-damped response spectra to yield design spectral ordinates that take into account the scattered motions introduced by the interaction effects. The modification factor is representative of the Transfer Function （TF） between the structural relative displacements and the free- field motion, which is described in terms of its maximum amplitude and associated frequency. Expressions to compute the modification factor by practicing engineers are proposed based upon a parametric study using 576 cases representative of actual structures. The method is tested in 10 cases spanning a wide range of common fundamental vibration periods. 展开更多
关键词 seismic soil structure interaction simplified procedures modified response spectra
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Enhancing soil structure and water dynamics through long-term mulched drip irrigation in arid reclaimed saline soils 认领 引用 被引量：1
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作者 Pengcheng Luo Rui Chen +7 位作者 Juanjuan Yang Tehseen Javed Jinzhu Zhang Pengpeng Chen Haiqiang Li Qinggang Liu Yu Chen Zhenhua Wang 《International Soil and Water Conservation Research》 SCIE CAS CSCD 2026年第1期171-184,共14页
Soil salinization is a global environmental issue,and in the arid regions of Xinjiang,China,mulched drip irrigation(MDI)has been extensively implemented to combat drought and improve agricultural productivity on recla... Soil salinization is a global environmental issue,and in the arid regions of Xinjiang,China,mulched drip irrigation(MDI)has been extensively implemented to combat drought and improve agricultural productivity on reclaimed saline wastelands.Despite its extensive use,the long-term impacts of MDI on soil physical properties and hydraulic characteristics remain underexplored.This study examines these long-term effects in cotton fields over 11,16,19,21,and 26 years.Initial results showed significant improvements,including increases in soil moisture content(7.7%–12.11%to 8.1%–14.58%),a decrease in soil bulk density(1.66–1.79 g cm−3 to 1.34–1.49 g cm−3),and an increase in total soil porosity(34.80%–38.49%to 44.50%–50.47%).However,after 19 years of continuous MDI application,improvements in soil properties plateaued.The geometric mean diameter(GMD),macro-aggregate content,and mean weight diameter(MWD)initially decreased during the first 11 years but improved thereafter.The Soil Structural Stability Index(SI)significantly increased with ongoing MDI application.MDI also enhanced soil water retention and hydraulic conductivity,with saturated hydraulic conductivity(Ks)and saturated water content(θs)peaking during the initial and middle phases(11,16,and 19 years),before diminishing in the later stages(21 and 26 years).Furthermore,MDI elevated soil organic carbon(SOC)levels and aggregate stability,bolstering soil resistance against degradation.Pearson correlation and principal component analyses underscored a positive relationship between SI,Ks,θs,SOC,and aggregate stability.This study confirms that MDI can effectively improve soil structure and dynamics,though its long-term sustainability requires periodic reassessment.These findings offer valuable insights into soil management strategies for achieving the UN's SDGs under similar environmental conditions. 展开更多
关键词 Soil structure Mulched drip irrigation Saline wastelands Sustainable agriculture Soil health
Structure-controlled piping and flow-like erosion in granite residual soil:critical gradients and conceptual model 认领 引用
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作者 CHEN Yicheng ZHOU Xiaowen +1 位作者 WAN Tian ZHANG Guochun 《Journal of Mountain Science》 SCIE CSCD 2026年第4期1581-1593,共13页
Granite residual soil(GRS)is highly disturbance-sensitive and prone to aggressive seepage,often triggering geohazards and engineering failures.However,previous studies have largely relied on simplified permeability te... Granite residual soil(GRS)is highly disturbance-sensitive and prone to aggressive seepage,often triggering geohazards and engineering failures.However,previous studies have largely relied on simplified permeability tests that decouple hydraulic measurements from deformation processes,leaving seepage-induced failure modes,critical hydraulic thresholds,and structure-controlled mechanisms poorly understood.To address these gaps,we conducted laboratory infiltration–deformation tests on undisturbed(UD)and remoulded(RM)GRS using a modified permeameter that couples hydraulic monitoring with real-time surface observation.UD specimens exhibited piping failure,whereas RM specimens underwent flow-like erosion,revealing fundamentally different failure modes governed by soil structure.The lower critical hydraulic gradient(onset of sustained particle mobilisation,iL)and upper critical hydraulic gradient(bulk failure threshold,iU)were determined as iL≈45,iU≈60 for UD,and iL≈95,iU≈105 for RM,indicating that natural structure reduces critical gradients by approximately half.The hydraulic conductivity-hydraulic gradient(k−i)trajectory provides a robust,less subjective basis for identifying these thresholds,revealing a pre-failure dip(transient clogging),a rebound at iL(sustained mobilisation),and a plateau beyond iU(stable conduit formation).Integrating mineral–chemical evolution,particle-size distribution,seepage behaviour,and eroded-particle spectra,we propose a fabric-controlled conceptual model:key support grains(0.075–0.02 mm)pin critical throats,while kaolinite-rich fines(<0.02 mm)and Fe-oxide cements bridge contacts.Under upward seepage,cement dispersion and key-grain mobilisation promote channelisation and piping in UD,whereas the homogenised fabric in RM delays channelisation and favours flow-like erosion.These findings advance the mechanistic understanding of structure-dependent seepage failures and offer practical guidance for GRS-bearing excavations and embankments,including limiting the hydraulic head difference relative to seepage path length(Δh/L)below iLand employing continuous hydraulic conductivity monitoring as an early-warning indicator for imminent piping. 展开更多
关键词 Granite residual soil Piping erosion Critical hydraulic gradient Soil structure Seepageinduced failure Conceptual model
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Phosphorus leaching in alkaline soils:the role of soil texture and pore structure 认领 引用
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作者 WANG Jie YANG Bangge +3 位作者 WEI Yujie ZHENG Hao XIONG Yi CAI Chongfa 《Journal of Mountain Science》 SCIE CSCD 2026年第2期583-596,共14页
Phosphorus(P)leaching in alkaline soils,exacerbated by excessive fertilizer application,represents a significant pathway for P loss.While soil pore structure and texture critically regulate P transport,mechanisms gove... Phosphorus(P)leaching in alkaline soils,exacerbated by excessive fertilizer application,represents a significant pathway for P loss.While soil pore structure and texture critically regulate P transport,mechanisms governing P loss in texturally diverse alkaline soils remain unclear.This study investigated P leaching dynamics and transport parameters across four alkaline soil textures(silty clay,clay loam,loam,sandy loam)using a one-dimensional convective-diffusion equation(CDE)based on column experiments.Results indicated that phosphorus leaching kinetics were predominantly governed by diffusion transport,evidenced by low Peclet numbers(Pe)(ranged from 0.02 to 0.31)across varying textures and initial P concentrations(C0).Comparative analysis of transport parameters revealed significant textural effects on dispersion coefficient(D),retardation factor(R),pore water velocity(V),Pe,and diffusion coefficient(λ)(F>523.42,p89.47,p<0.001).Saturated hydraulic conductivity(Ks)(R2=62.9%,p<0.01)and total pore area(A)(R2=12.4%,p<0.01)emerged as primary regulators of P leaching.Enhanced clay content increased total pore area while reducing average pore diameter,concurrently decreasing pore water velocity and saturated infiltration rates.These textural modifications amplified diffusive P transport within soil matrices.The findings provide mechanistic insights into texturedependent P mobility in alkaline environments,informing targeted strategies for agricultural phosphorus management. 展开更多
关键词 Soil phosphorus leaching Alkaline soil Soil texture Soil pore structure Convective dispersive equation
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Impact of short-term organic amendments incorporation on soil structure and hydrology in semiarid agricultural lands 认领 引用 被引量：6
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作者 Li Dong Wentong Zhang +5 位作者 Yunwu Xiong Jiaye Zou Quanzhong Huang Xu Xu Ping Ren Guanhua Huang 《International Soil and Water Conservation Research》 SCIE CSCD 2022年第3期457-469,共13页
Soil structure plays an important role in edaphic conditions and the environment. In this study, we investigated the effects of organic amendment on soil structure and hydraulic properties. A corn field in a semiarid ... Soil structure plays an important role in edaphic conditions and the environment. In this study, we investigated the effects of organic amendment on soil structure and hydraulic properties. A corn field in a semiarid land was separately amended with sheep manure compost at five different rates (2, 4, 6, 8 and 10 t/ha) and corn stover (6 t/ha) in combination with two decomposing agents. The soil structure of different amended soils was analyzed from the aggregate and pore domain perspectives. The internal pore structure of the soil was visualized through X-ray computed tomography and quantified using a pore-network model. Soil aggregate-size distribution and stability, saturated hydraulic conductivity, and water-retention curves were measured by sampling or in situ. The gas permeability and diffusivity of different amended soils were simulated based on the extracted pore networks. The aggregate stability of the amended soils was improved compared with the control, that is, the mean weight diameter increased and the percentage of aggregate destruction decreased. The stability of soil aggregates varied non-monotonically with the application rate of compost and decreased after treatment with corn stover and decomposing agents. The pore-network parameters including air-filled porosity, pore radius, throat length, and coordinate number increased for the amended soils compared with the control. The mean pore size increased with increasing compost incorporation rate. The saturated hydraulic conductivity of the compost-amended soils was higher than that of the control but varied quadratically with the application rate. The saturated hydraulic conductivity of soil treated with corn stover and decomposing agents was clearly higher than that without the agent and the control. The greater gas diffusivity and air permeability indicate that soil aeration improved following the incorporation of organic amendments. The air permeability versus air-filled porosity relationship followed a power law, and the gas diffusivity versus air-filled porosity relationship was characterized by a generalized density-corrected model regardless of amendment. The findings of this study can help improve the understanding of soil structure and hydrological function to organic fertilizer incorporation and further monitor the quality of soil structure through the pore space perspective. 展开更多
关键词 Soil structure Soil aggregate Organic amendment Hydraulic conductivity Pore-network
Grassland management intensity determines root development,soil structure,and their interrelationship:Results of a regional study of Leptosols in the Swabian Alps 认领 引用 被引量：2
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作者 Katrin Kuka Monika Joschko 《Grassland Research》 2024年第2期171-186,共16页
Background:Soil structure is a key indicator of the functioning of soil processes in grasslands,which is influenced by site conditions and management.Methods:In this study,we investigated soil structure and its relati... Background:Soil structure is a key indicator of the functioning of soil processes in grasslands,which is influenced by site conditions and management.Methods:In this study,we investigated soil structure and its relationship with root growth in 31 Leptosols under different grassland management intensities using X-ray microcomputed tomography.A close relationship between land use intensity,soil structure,and root growth was observed.Results:Our results show that land use type affects root development and soil structure.Pastures had more developed roots and more structured soils than meadows and mown pastures.However,all pastures were unfertilized,while meadows and mown pastures had both fertilized and unfertilized plots.Although no significant differences were found in the unfertilized plots,sample size was limited.In particular,fertilization negatively affected root growth and soil structure,resulting in significant differences between fertilized and unfertilized grasslands.Mowing frequency also had an effect on soil physics,but to a much lesser extent than fertilization.Conclusions:Increased land use intensity,characterized by increased fertilization and more frequent mowing,reduces root growth and adversely affects soil structure.Therefore,X-ray microcomputed tomography is a suitable method to investigate the relationship between soil structure and roots in the soil. 展开更多
关键词 land use intensity meadow-mown pasture-pasture soil structure root-soil interaction X-ray microcomputed tomography
Snow removal promotes microbial-mediated organic carbon stabilization within soil aggregates in a peatland of Northeast China 认领 引用 被引量：1
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作者 Jiawen YAN Lianxi SHENG +3 位作者 Siyuan LU Xiaofei YU Yahya KOOCH Yuanchun ZOU 《Pedosphere》 SCIE CAS CSCD 2025年第4期751-762,共12页
Global climate change exerts profound effects on snow cover,with consequential impacts on microbial activities and the stability of soil organic carbon(SOC)within aggregates.Northern peatlands are significant carbon r... Global climate change exerts profound effects on snow cover,with consequential impacts on microbial activities and the stability of soil organic carbon(SOC)within aggregates.Northern peatlands are significant carbon reservoirs,playing a critical role in mitigating climate change.However,the effects of snow variations on microbial-mediated SOC stability within aggregates in peatlands remain inadequately understood.Here,an in-situ field experiment manipulating snow conditions(i.e.,snow removal and snow cover)was conducted to investigate how snow variations affect soil microbial community and the associated SOC stability within soil aggregates(>2,0.25-2,and<0.25 mm)in a peatland of Northeast China.The results showed that snow removal significantly increased the SOC content and stability within aggregates.Compared to the soils with snow cover,snow removal resulted in decreased soil average temperatures in the topsoil(0-30 cm depth)and subsoil(30-60 cm depth)(by 1.48 and 1.34°C,respectively)and increased freeze-thaw cycles(by 11 cycles),consequently decreasing the stability of aggregates in the topsoil and subsoil(by 23.68%and 6.85%,respectively).Furthermore,more recalcitrant carbon and enhanced SOC stability were present in microaggregates(<0.25 mm)at two soil depths.Moreover,reductions in bacterial diversity and network stability were observed in response to snow removal.Structural equation modeling analysis demonstrated that snow removal indirectly promoted(P<0.01)SOC stability by regulating carbon to nitrogen(C:N)ratio within aggregates.Overall,our study suggested that microaggregate protection and an appropriate C:N ratio enhanced carbon sequestration in response to climate change. 展开更多
关键词 aggregate stability carbon sequestration climate change microbial community structure snow cover soil structure
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Soil aggregate stability assessment based on ultrasonic agitation:Limitations and recommendations after sixty years(1964–2023) 认领 引用
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作者 Fakher ABBAS Jianjun DU +2 位作者 Haibin CHEN Muhammad AZEEM Ruqin FAN 《Pedosphere》 SCIE CAS CSCD 2025年第1期67-83,共17页
Soil aggregate stability is a fundamental measure for evaluating soil structure.While numerous tests exist for assessing soil aggregate stability,ultrasonic agitation(UA)is widely recognized for its effectiveness.None... Soil aggregate stability is a fundamental measure for evaluating soil structure.While numerous tests exist for assessing soil aggregate stability,ultrasonic agitation(UA)is widely recognized for its effectiveness.Nonetheless,a significant limitation of UA is the lack of standardized methodologies and stability assessment criteria,resulting in inconsistency and incomparability across studies.Several critical factors influence the assessment of soil aggregate stability,including sample preparation(e.g.,drying,sieving,and settling duration),initial and final aggregate size classes,the definition of final energy form and its calculation,variations in instrumentation and laboratory procedures,and the absence of standardized criteria.Unlike some stability methods,UA produces a broad range of results,with dispersion energy varying significantly(0.5–13440 J g-1)across different soil and aggregate types due to divergent procedural settings.These settings encompass factors such as initial power and amplitude,temperature fluctuation,soil/water ratio,probe specification(diameter and insertion depth),and the choice of liquid used during the process.Furthermore,UA faces challenges related to limited reproducibility,raising doubts about its status as a standard stability assessment method.To address these issues,standardization through predefined procedures and stability criteria has the potential to transform UA into a precise and widely accepted method for both qualitative and quantitative assessments of soil stability.In this comprehensive review,we outline the challenges in standardizing UA,elucidate the factors contributing to dispersion energy variation,and offer practical recommendations to establish standardized protocols for UA in soil aggregate stability assessments. 展开更多
关键词 aggregate cavitation dispersion energy particle size distribution soil structure stability method ultrasonication
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Influence of Soil-Structure Interaction Models on the Dynamic Responses of An Offshore Wind Turbine Under Environmental Loads 认领 引用 被引量：2
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作者 TANG Hong-ming YUE Min-nan +3 位作者 YAN Yang-tian LI Zhi-hao LI Chun NIU Kai-lun 《China Ocean Engineering》 SCIE EI CSCD 2023年第2期218-231,共14页
Offshore wind turbines(OWTs) suffer wind, wave and earthquake loads. The investigation of OWTs' dynamic response under environmental loads is essential for structural safety assessment. The soil-structure interact... Offshore wind turbines(OWTs) suffer wind, wave and earthquake loads. The investigation of OWTs' dynamic response under environmental loads is essential for structural safety assessment. The soil-structure interaction(SSI)significantly affects the responses of OWT under environmental loads. However, there is few systematic research about the difference in the dynamic response of different SSI models under environmental loads. In order to solve the problem, the OWT is modeled by shell element, and several SSI models are built. The wind, wave and earthquake loads are taken into account. Moreover, the dynamic response, fatigue and buckling analysis are performed by ANSYS. The results indicate that SSI cannot be ignored in the dynamic response of the OWT under wind and wave loads. The SSI can decrease the displacement response of the OWT by 19% under wind and wave loads and reduce the fatigue damage of the pile. Multi-layer SSI can strongly influence the OWT's dynamic response under wind and wave loads or earthquake-only load. The vertical earthquake load increases the dynamic response in three directions.Besides, in order to simulate real environment, multi-layer SSI, soil damping and vertical SSI must be considered to evaluate the displacement response of the OWT under wind, wave and earthquake loads. The earthquake and gravity loads can cause more obvious response of the OWT than that of only wind and wave loads. The top and bottom of the tower are prone to occur buckling. 展开更多
关键词 OWT soil structure interaction earthquake dynamic analysis structural damage
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Analysis of the Microstructure and Macroscopic Fluid-Dynamics Behavior of Soft Soil after Seepage Consolidation 认领 引用 被引量：1
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作者 Fang Jin Dong Zhou Liying Zhu 《Fluid Dynamics & Materials Processing》 EI 2022年第2期285-302,共18页
The purpose is to study the microstructure and macroscopic fluid-dynamic behavior of soft soil after it has been subjected to a seepage consolidation procedure.First,the microscopic pore structure of soft clay is quan... The purpose is to study the microstructure and macroscopic fluid-dynamic behavior of soft soil after it has been subjected to a seepage consolidation procedure.First,the microscopic pore structure of soft clay is quantitatively studied by a scanning electron microscope technique.Second,the average contact area rate of soil particles is obtained employing statistical analysis applied to microscopic images of soft soil,and the macroscopic porosity of soft clay is determined through an indoor geotechnical test.Finally,mathematical relationships are introduced by fitting the results of the test.The results show that the unmodified empirical equation for the permeability coefficient of coarse-grained soil produces large errors in calculations related to cohesive soils.By contrast,the permeability coefficient calculated by the empirical equation modified by the average contact area ratio theory is in good agreement with the measured average value of the indoor test. 展开更多
关键词 Seepage consolidation soil structure microstructure macro-mechanics
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Effects of seasonal water-level fluctuation on soil pore structure in the Three Gorges Reservoir,China 认领 引用 被引量：12
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作者 ZHANG Shu-juan TANG Qiang +5 位作者 BAO Yu-hai HE Xiu-bin TIAN Feng-xia LüFa-you WANG Ming-feng Raheel ANJUM 《Journal of Mountain Science》 SCIE CSCD 2018年第10期2192-2206,共15页
Inundation of the Three Gorges Reservoir has created a 30-m water-level fluctuation zone with seasonal hydrological alternations of submergence and exposure, which may greatly affect soil properties and bank stability... Inundation of the Three Gorges Reservoir has created a 30-m water-level fluctuation zone with seasonal hydrological alternations of submergence and exposure, which may greatly affect soil properties and bank stability. The aim of this study was to investigate the response of soil pore structure to seasonal water-level fluctuation in the reservoir, and particularly, the hydrological change of wetting and drying cycles. Soil pore structure was visualized with industrial X-ray computed tomography and digital image analysis techniques. The results showed that soil total porosity(? 100 ?m), total pore number, total throat number, and mean throat surface area increased significantly under wetting and drying cycles. Soil porosity, pore number and throat numberwithin each size class increased in the course of wetting and drying cycles. The coordination number, degree of anisotropy and fractal dimension were indicating an increase. In contrast, the mean shape factor, pore-throat ratio, and Euler-Poincaré number decreased due to wetting and drying cycles. These illustrated that the wetting and drying cycles made soil pore structure become more porous, continuous, heterogeneous and complex. It can thus be deduced that the water-level fluctuation would modify soil porosity, pore size distribution, and pore morphology in the Three Gorges Reservoir, which may have profound implications for soil processes, soil functions, and bank stability. 展开更多
关键词 Soil pore structure X-ray computed tomography Image analysis Wetting and drying cycles Water-level fluctuation Three Gorges
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