期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到217篇文章
< 1 2 … 11 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Living characteristics of rare and endangered species Davidia involucrata 认领 引用 被引量：12
1
作者 吴钢 韩单恒 +3 位作者 王宏昌 罗跃初 邓红兵 赵景柱 《Journal of Forestry Research》 CAS 2004年第1期39-44,J002,共6页
Dovetree (Davidia involucrate), one of the first-class protective plants in China, is a relic species of paleotropical kingdom in Tertiary period, belonging toDavidiaceae with a single genus. In recent years, the incr... Dovetree (Davidia involucrate), one of the first-class protective plants in China, is a relic species of paleotropical kingdom in Tertiary period, belonging toDavidiaceae with a single genus. In recent years, the increase of regional developing projects has led to a sharp decrease of this ancient and rare plant in naturally distributed habitats and natural population. In this paper, the biological and ecological characteristics of Dovetree were described, and the geographically distributed condition of this species in different geologic periods as well as the major reasons for dynamic changes of its population were systematically analyzed in accordance with field researches and references. The investigations conducted in different years by setting up standard sample plots showed that the population number of Dovetree increased yearly in the areas without human interference but decreased yearly in the areas with human interference. With the increase of population density and human activities decreased as the logarithmic curve:Y=?100.7ln(x)+178.09, and it has turned from a dominant population into an endangered population. Based on the former and present studies on Dovetree, some protection strategies were put foreword for protecting this ancient and rare species. Keywords Davidia involucrate - Dovetree - Geographical Distribution - Biological Characteristics - Protection Policy CLC number S718.4 Document code A Article ID 1007-662X(2004)01-0039-06 Foundation Item: This research was coordinated by the National Natural Science Foundation of China (No. 39970591)Biography: Wu Gang (1965-), Male, Professor in Key Laboratory of Systems Ecology, Research Center for Eco Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.Responsible editor: Chai Ruihai 展开更多
关键词 Davidia involucrate Dovetree Geographical Distribution Biological Characteristics Protection Policy
暂未订购 下载PDF
Cryptic divergences and repeated hybridizations within the endangered “living fossil” dove tree(Davidia involucrata) revealed by whole genome resequencing 认领 引用 被引量：9
2
作者 Yumeng Ren Lushui Zhang +5 位作者 Xuchen Yang Hao Lin Yupeng Sang Landi Feng Jianquan Liu Minghui Kang 《Plant Diversity》 SCIE CAS CSCD 2024年第2期169-180,共12页
The identification and understanding of cryptic intraspecific evolutionary units(lineages) are crucial for planning effective conservation strategies aimed at preserving genetic diversity in endangered species.However... The identification and understanding of cryptic intraspecific evolutionary units(lineages) are crucial for planning effective conservation strategies aimed at preserving genetic diversity in endangered species.However, the factors driving the evolution and maintenance of these intraspecific lineages in most endangered species remain poorly understood. In this study, we conducted resequencing of 77 individuals from 22 natural populations of Davidia involucrata, a “living fossil” dove tree endemic to central and southwest China. Our analysis revealed the presence of three distinct local lineages within this endangered species, which emerged approximately 3.09 and 0.32 million years ago. These divergence events align well with the geographic and climatic oscillations that occurred across the distributional range.Additionally, we observed frequent hybridization events between the three lineages, resulting in the formation of hybrid populations in their adjacent as well as disjunct regions. These hybridizations likely arose from climate-driven population expansion and/or long-distance gene flow. Furthermore, we identified numerous environment-correlated gene variants across the total and many other genes that exhibited signals of positive evolution during the maintenance of two major local lineages. Our findings shed light on the highly dynamic evolution underlying the remarkably similar phenotype of this endangered species. Importantly, these results not only provide guidance for the development of conservation plans but also enhance our understanding of evolutionary past for this and other endangered species with similar histories. 展开更多
关键词 Davidia involucrata Cryptic lineage Hybridization Population genomics Positive evolution
暂未订购 下载PDF
珙桐(Davidia involucrata Baill.)苞片功能性状及性状间关系对海拔的响应 认领 引用 被引量：6
3
作者 刘婷婷 刘沁松 +4 位作者 徐文娟 徐治兵 李中阳 杨宝臻 胥晓 《生态学杂志》 CAS CSCD 北大核心 2020年第3期794-802,共9页
珙桐(Davidia involucrata Baill.)的苞片被认为是对传粉者和非生物因素等驱动力的适应,往往受到环境因子的影响。为揭示其功能性状及其性状间关系对海拔的响应,本研究采用独立样本t检验和标准化主轴分析方法对比了四川龙苍沟1400和180... 珙桐(Davidia involucrata Baill.)的苞片被认为是对传粉者和非生物因素等驱动力的适应,往往受到环境因子的影响。为揭示其功能性状及其性状间关系对海拔的响应,本研究采用独立样本t检验和标准化主轴分析方法对比了四川龙苍沟1400和1800 m不同海拔珙桐种群中花苞片的功能性状和性状间关系。结果显示:1)低海拔(1400 m)珙桐种群大、小苞片的长、宽和面积,以及单花苞片总面积均显著大于高海拔(1800 m)种群(P<0.05),且高、低海拔种群的大、小苞片面积及重量呈等比例生长;2)低海拔珙桐种群大、小苞片干重及单花苞片总干重均显著高于高海拔种群(P<0.05);3)高、低海拔种群的花序轴长与干重均无显著差异(P=0.446;P=0.791),高海拔花序轴干重与长间呈异速生长关系,而低海拔呈等速生长关系;4)珙桐大、小苞片的长宽间、面积间以及重量间关系在高、低海拔上均表现出等速生长,单花苞片的总面积和总干重分别与花序轴干重在高、低海拔上均表现出等速生长关系,而与花序轴长表现出异速生长关系。上述结果表明,珙桐苞片的功能性状及其性状间关系在不同海拔存在显著差异,这种现象可能是其在长期进化过程中抵抗环境干扰、保护繁育器官和提高授粉几率而形成的一种适应策略。 展开更多
关键词 珙桐 花序轴 性状 异速生长 繁殖器官
暂未订购 下载PDF
珙桐(Davidia involucrata Baill)研究综述 认领 引用 被引量：16
4
作者 司继跃 雷妮娅 +1 位作者 司培燕 李俊清 《科学技术与工程》 2009年第13期3713-3719,3725,共7页
珙桐(Davidia involucrata Baill)作为第三纪古热带孑遗树种,国家一级保护植物,具有特殊的科学研究价值和极高的观赏价值。20世纪80年代以来受到了有关方面及科研工作者的广泛重视。从以下4个方面对珙桐研究现状进行了综述:(1)解剖学与... 珙桐(Davidia involucrata Baill)作为第三纪古热带孑遗树种,国家一级保护植物,具有特殊的科学研究价值和极高的观赏价值。20世纪80年代以来受到了有关方面及科研工作者的广泛重视。从以下4个方面对珙桐研究现状进行了综述:(1)解剖学与生物学特征及珙桐在系统发育中的归属问题研究;(2)生态学特性与珙桐自然分布区生态条件的研究;(3)珙桐的种群生态学与群落生态学研究;(4)珙桐的繁殖与人工引种研究。 展开更多
关键词 珙桐 濒危机制 研究综述
暂未订购 下载PDF
A Preliminary Vegetation-Ecological Study of Davidia involucrataForest 认领 引用 被引量：1
5
作者 Haimei You Kazue Fujiwara Yanhong Liu 《Natural Science》 2014年第12期1012-1029,共18页
Davidia involucrata is a rare endangered species belonging to the paleo-tropical flora of the Tertiary period, endemic to China, and has an important protection and ornamental value. However, the natural populations a... Davidia involucrata is a rare endangered species belonging to the paleo-tropical flora of the Tertiary period, endemic to China, and has an important protection and ornamental value. However, the natural populations and distribution areas of this ancient plant have been decreased sharply, because it suffers much disturbance from human activity in many regions. In this paper, data on Davidia involucrata forest in its most natural distribution areas were collected;the percentages of geographical areal types of seed-plant genera (Sensu Wu 1991) were summed;the community types were summarized using Braun-Blanquet methodology;and the geographical differentiation among communities was analyzed by detrended canonical correspondence analysis. The analysis of geographical types shows that temperate species are dominant and that tropical species also make up a high percentage. This indicates that Davidia involucrata forest is mainly temperate vegetation. In total, 16 communities were recognized by classification, and these communities were usually dominated by deciduous broad-leaved species, sometimes mixed with some evergreen species. The shrub layer of Davidia involucrata forest is generally occupied by bamboos. The geographical patterns among the communities are influenced mainly by temperature and moisture availability, and the forest is most likely to grow in warm, humid habitats. 展开更多
关键词 China Community Classification Phytogeographical Areal Type Davidia involucrata
暂未订购 下载PDF
Effects of life-history components on population dynamics of the rare endangered plant Davidia involucrata 认领 引用 被引量：1
6
作者 Haimei You Yanhong Liu Kazue Fujiwara 《Natural Science》 2013年第1期62-70,共9页
In order to estimate the most effect stage and process on population growth and effective conserve the rare endangered plant Davidia involucrata, we analyzed the dynamics and the contributions of life-history componen... In order to estimate the most effect stage and process on population growth and effective conserve the rare endangered plant Davidia involucrata, we analyzed the dynamics and the contributions of life-history components on population dynamics based on Lefkovitch matrix model and sensitivity analysis. The life cycle of Davidia involucrata was divided into six stages (seed, seedling, juvenile, immature, early adult and late adult) based on the species characteristics and published literature data, the survival rates in each life-history stage were simulated using a static life table, and the fecundity of each stage was determined according to sample information. The results showed that the structure of the observed population was not ideal, and the numbers of seedlings and coppice shoots was similar. The population growth rate was influenced largely by individual growth process, and asexual reproduction made a larger contribution to population growth than sexual reproduction. However, sexual reproduction was more important than asexual reproduction, because most asexual reproducing individuals (the coppice shoots) were derived mainly from human destruction (e.g. felling trees). The most important stage was stage V (late adult), associated with seed production and germination. Therefore, conservation of Davidia involucrata populations should focus on stage V and sexual reproduction, in order to improve the seed production and germination rate, and to promote population stability and development. 展开更多
关键词 Davidia involucrata Lefkovitch Matrix model Life-History Stage Population Ecology Sensitivity Analysis
暂未订购 下载PDF
Isolation and Identification of an Endophytic Strain with Antibiosis Ability from Davidia involucrate Brail. 认领 引用
7
作者 NI Guo-rong PAN Xiao-hua +2 位作者 TU Guo-quan KUANG Fu-yuan WEI Sai-jin 《Agricultural Science & Technology》 CAS 2011年第8期1107-1110,共4页
[Objective]The aim was to isolate and identify an endophytic bacteria strain with antimicrobial activity from Davidia involucrate Brail.[Method]Endophytic strain with antibiosis ability was isolated from D.involucrate... [Objective]The aim was to isolate and identify an endophytic bacteria strain with antimicrobial activity from Davidia involucrate Brail.[Method]Endophytic strain with antibiosis ability was isolated from D.involucrate Brail by using cylinder-plate method.Then,it was identified through physiological and biochemical tests,16S rDNA homology analysis as well as some gene-specific sequence analysis.[Result]B221 stain had antimicrobial activity against a variety of rice plant pathogens,and it was identified as Bacillus subtilis.[Conclusion]This study enriches the research on endophyte within D.involucrate Brail,application of Bacillus bio-control,and therefore has laid a good foundation for the development of fungus used in biological control of crop pathogens. 展开更多
关键词 Davidia involucrate Brail Endophytic bacteria Identification Antimicrobial activity
暂未订购 下载PDF
珙桐Davidia involucrata Bail. 认领 引用
8
作者 刘仁林 《江西林业科技》 2009年第1期
落叶乔木,高15～20m;树皮灰褐色,不规则片状剥落。芽鳞覆瓦状排列。叶宽卵形,长9～15cm,宽2.5～4.5cm,基部心形,先端渐尖,叶边缘具明显锯齿;叶面近无毛。
关键词 珙桐 水梨子 Davidia involucrata Bail 播种繁殖
暂未订购 下载PDF
不同树龄珙桐根际和根内微生物的群落特征及构建机制 认领 引用 被引量：1
9
作者 王宇 王毅敏 +5 位作者 高晗 陈邦清 彭刚志 谭艳 郑思怡 高本旺 《生物技术通报》 EI CAS CSCD 北大核心 2026年第5期158-173,共16页
【目的】揭示不同树龄珙桐(Davidia involucrata)根际与根内微生物群落组成、代谢功能及组装机制的动态变化规律。【方法】基于16S rRNA基因和ITS序列扩增子测序技术,分析了不同树龄珙桐(树龄小于50年、50-100年及100年以上)根际和根内... 【目的】揭示不同树龄珙桐(Davidia involucrata)根际与根内微生物群落组成、代谢功能及组装机制的动态变化规律。【方法】基于16S rRNA基因和ITS序列扩增子测序技术,分析了不同树龄珙桐(树龄小于50年、50-100年及100年以上)根际和根内微生物群落组成、多样性、与土壤理化因子的相关性、代谢功能特点及群落组成机制。【结果】不同树龄珙桐根际和根内微生物群落α多样性均不存在显著性差异,但根际和根内细菌群落β多样性存在显著性差异。通过LEfSe分析,确定了芽单胞菌门(Gemmatimonadota)、疣微菌门(Verrucomicrobiota)、拟锁瑚菌属(Clavulinopsis)、湿伞属(Gliophorus)、纺锤孢属(Atractospora)等标志性分类单元。不同树龄珙桐根际和根内微生物群落存在一定差异,但优势细菌类群主要为变形菌门(Proteobacteria)、放线菌门(Actinobacteriota),真菌则以子囊菌门(Ascomycota)和担子菌门(Basidiomycota)为主。功能预测表明,细菌核心功能集中于新陈代谢和遗传信息处理,真菌群落则以腐生营养型为主。在二级功能中,根际细菌在异源物质代谢、脂代谢存在显著性差异,根内细菌仅糖链的生物合成与代谢存在显著性差异;根际真菌在植物病原菌和叶腐生菌功能类群差异显著,根内真菌无显著性差异。Mantel test显示,土壤理化因子与微生物群落整体无显著相关性,但酸杆菌门(Acidobacteriota)、绿弯菌门(Chloroflexi)等优势类群与理化因子显著相关。PLS-PM揭示树龄对根内微生物群落的多样性影响更强。群落组装分析证实,根际细菌群落由随机性过程主导,根内细菌群落以确定性过程为主,根际与根内真菌群落均受确定性过程支配。【结论】树龄会对珙桐根际和根内微生物群落及功能产生一定影响,且群落的组装机制会随着树龄的增加呈现动态变化。 展开更多
关键词 珙桐 根际 内生菌 群落结构 功能预测 群落组装
暂未订购 下载PDF
濒危植物珙桐根际微生物和根内生菌群落特点及功能分析 认领 引用
10
作者 王宇 陈邦清 +4 位作者 高晗 王毅敏 谭艳 姚溢 高本旺 《广西植物》 CAS CSCD 北大核心 2026年第1期173-185,共13页
为研究不同种源珙桐(Davidia involucrata)根际和根内微生物群落特征及功能规律,该研究以珙桐根际土壤和根部组织为研究材料,通过16S rRNA基因和ITS序列扩增子测序技术,对其群落组成、多样性、与理化因子的相关性及共现网络进行了分析... 为研究不同种源珙桐(Davidia involucrata)根际和根内微生物群落特征及功能规律,该研究以珙桐根际土壤和根部组织为研究材料,通过16S rRNA基因和ITS序列扩增子测序技术,对其群落组成、多样性、与理化因子的相关性及共现网络进行了分析且对其功能进行了预测。结果表明:(1)两个种源根际和根内微生物群落之间α多样性差异不显著,但β多样性存在显著性差异。(2)两个种源珙桐根际和根内优势细菌为变形菌门、酸杆菌门和放线菌门,而真菌则以子囊菌门与担子菌门为主;属分类水平则表现出特异性富集。(3)共现网络分析揭示了珙桐根际与根内细菌互作复杂度更高,其网络平均度及模块化等网络拓扑指数均高于真菌,揭示了真菌群落更高的保守性。(4) LEfSe分析表明,存在39个细菌分类单元和30个真菌分类单元且种源间具有显著性差异。(5)理化因子与微生物群落相关性显示,仅土壤有机碳与根际土壤细菌优势群落呈显著正相关,土壤速效钾与根内真菌群落呈显著正相关,其他理化因子与微生物群落无显著相关性。(6)功能预测表明,根际和根内优势细菌主要参与新陈代谢等功能,真菌则以腐生营养型为主。两个种源根际细菌群落在次生代谢物的合成、转录,以及折叠、分选和降解等11种功能均存在显著性差异,根际真菌仅地衣共生真菌功能存在显著性差异。综上认为,种源可影响微生物的组成与互作,并塑造功能差异化,这些差异可能影响珙桐的生态适应性,因此该研究结果可为濒危植物珙桐的迁地保护提供微生物组层面的理论支撑。 展开更多
关键词 珙桐 根际 内生菌 群落结构 共现网络 功能预测
暂未订购 下载PDF
光叶珙桐幼苗对PEG模拟干旱胁迫的生理响应 认领 引用
11
作者 高兴国 王磊 杨顺强 《吉林林业科技》 2026年第4期7-13,36,共7页
为了解光叶珙桐幼苗对干旱胁迫的生理响应,本研究以3年生光叶珙桐幼苗为对象,以PEG模拟干旱胁迫,对光叶珙桐叶片中的叶绿素(Chl)、游离脯氨酸(Pro)、可溶性总糖、可溶性蛋白、丙二醛(MDA)含量以及抗氧化酶(SOD、POD、CAT)活性的变化进... 为了解光叶珙桐幼苗对干旱胁迫的生理响应,本研究以3年生光叶珙桐幼苗为对象,以PEG模拟干旱胁迫,对光叶珙桐叶片中的叶绿素(Chl)、游离脯氨酸(Pro)、可溶性总糖、可溶性蛋白、丙二醛(MDA)含量以及抗氧化酶(SOD、POD、CAT)活性的变化进行分析。光叶珙桐叶片中的叶绿素具有较强的干旱敏感性,Chla含量与Chlb含量的比值较高,其对直射光适应性强。可溶性总糖含量在轻度胁迫时显著增加,在重度干旱条件下适应性响应减弱。Pro含量在干旱胁迫初期显著增加,但随胁迫时间延长而下降,表明其对短期干旱胁迫敏感,但长期胁迫下调节能力有限。随胁迫强度提高可溶性蛋白含量先升后降,在短期胁迫下起到保护作用,但在长期与严重胁迫下含量降低。抗氧化酶对干旱胁迫反应灵敏,但保护作用较弱。轻度胁迫保护酶活性较强使MDA产量下降,随胁迫强度提高细胞膜受到破坏,保护酶活性受到抑制而MDA增多。研究结果表明,3年生光叶珙桐通过增加光合色素、渗透调节物质和抗氧化酶活性等途径适应干旱胁迫,但对干旱环境的适应能力较弱,难以适应更严重的干旱条件。 展开更多
关键词 光叶珙桐 干旱胁迫 生理响应
暂未订购 下载PDF
美姑县珙桐古树群病虫害监测与绿色防控技术 认领 引用
12
作者 曲比石主 《林业科技通讯》 2026年第8期53-56,共4页
针对美姑县珙桐(Davidia involucrata)古树群病虫害监测精度不足与防控措施协同优化程度低的问题,构建“多源监测-智能识别-预测预警-优化调控”一体化技术体系.基于无人机多光谱遥感、物联网传感及深度学习图像识别,实现病虫害多尺度... 针对美姑县珙桐(Davidia involucrata)古树群病虫害监测精度不足与防控措施协同优化程度低的问题,构建“多源监测-智能识别-预测预警-优化调控”一体化技术体系.基于无人机多光谱遥感、物联网传感及深度学习图像识别,实现病虫害多尺度动态监测;采用LSTM模型进行时序预测,MAPE控制在5%以内;进一步构建NSGAGII多目标优化模型,实现防控效果、成本与生态扰动的协同优化.结果表明:融合监测精度提升至95.8%,虫口密度降低55%~65%,农药使用量下降60%,生态扰动显著降低.研究表明,该技术体系可实现古树群病虫害精准监测与绿色防控的工程化应用,为生态脆弱区珍稀树种保护提供技术支撑. 展开更多
关键词 珙桐古树群 Davidia involucrata 病虫害监测 多源数据融合 绿色防控 多目标优化
暂未订购 下载PDF
Cloning and Expression of a Cold-induced Gene(DiRCI)from Davidia involucrata(Davidiaceae) 认领 引用 被引量：6
13
作者 JI Hong-Chun SU Zhi-Xian +3 位作者 YANG Jun BIAN Chun-Xian HU Jin-Yao QI Gang 《云南植物研究》 北大核心 2010年第2期150-157,共8页
A cold-induced plasma membrane protein which plays a protective role in avoiding freezing injury for some plants is one of hydrophobic proteins.A gene,named as DiRCI,was isolated from the cDNA library of Davidia invol... A cold-induced plasma membrane protein which plays a protective role in avoiding freezing injury for some plants is one of hydrophobic proteins.A gene,named as DiRCI,was isolated from the cDNA library of Davidia involucrata,containing an open reading frame of 174 bp flanked by a 92 bp 5′-untranslated sequence and a long 273 bp 3′-non-coding region.Alignment analysis indicated that the deduced amino acid sequence of 57 amino acids was high conserved with the MpRCI from Plantago asiatica,and the identity was 89.5%.Semi-quantitative reverse transcription-polymerase chain reaction(RT-PCR)analysis showed that DiRCI wasn′t detected in various organs of D.involucrata above 25℃.When the plant grew under 8℃,the gene expressed in leaves,leafstalk and seeds,but not the roots.The expression level gradually increased after 4 h of the cold treatment and reached a maximum during 24-48 h,and then decreased.The results indicated the gene did have a relation with cold stress in plant and was predicted to be one DiRCI gene.The present data not only enrich gene resources of D.involucrata,but also laid a foundation for the research on molecular mechanism of plant acclimation to cold stress. 展开更多
关键词 Davidia involucrata Gene Cloning Cold-induced Semi-quantitative RT-PCR
暂未订购 下载PDF
配方施肥对珙桐幼苗生长及其生态化学计量特征的影响 认领 引用
14
作者 张尧尧 任启飞 +1 位作者 符行琴 陈云飞 《广西植物》 CAS CSCD 北大核心 2026年第6期1003-1015,共13页
为探究珙桐(Davidia involucrata)幼苗生长所需氮(N)、磷(P)、钾(K)的最佳施肥量,该研究以1年生珙桐幼苗为对象,通过盆栽控制试验,以黄棕壤为基质,测定其基本理化指标,采用“3414”测土配方施肥法设置N、P、K三个因素,0、1、2、3四个水... 为探究珙桐(Davidia involucrata)幼苗生长所需氮(N)、磷(P)、钾(K)的最佳施肥量,该研究以1年生珙桐幼苗为对象,通过盆栽控制试验,以黄棕壤为基质,测定其基本理化指标,采用“3414”测土配方施肥法设置N、P、K三个因素,0、1、2、3四个水平共14个处理(T1-T14),测定各处理生长条件下幼苗与叶、根生态化学计量特征指标,统计分析各指标的处理间差异及其相关关系。结果表明:(1)各处理珙桐幼苗叶和根的C含量差异较小;N、P含量表现出显著性差异(P<0.05),分别与N、P施肥水平呈正相关。(2)T2(N0P2K2)下叶和根的C∶N、N∶P失衡,限制了珙桐幼苗生长;各处理下叶和根的N∶P处于4.86至13.65之间,均低于14,受到N的限制。(3)比叶重、总生物量、株高增长量、地径增长量均表现为T11(N3P2K2)最低,分别比T1(N0P0K0)低6.78%、32.88%、18.91%、6.82%,T13(N1P2K1)促生长效果最显著,分别比T1高12.39%、82.37%、201.75%、120.45%。(4)相关分析显示,比叶重与根的N含量、叶和根的N∶P呈显著正相关(P<0.05),总生物量与根的C含量呈显著正相关(P<0.05),生长特征与化学计量特征之间存在一定关联性。(5)多重比较结果显示,N对各生长特征及根的C、N含量和叶的N、P含量有显著影响(P<0.05),P对比叶重、株高增长量和地径增长量,以及叶和根的P含量有显著影响(P<0.05),K对比叶重、株高增长量、地径增长量有显著影响(P<0.05)。综上认为,盆栽珙桐幼苗应注重N、P、K的均衡施用,避免因N施加过量(7.95 g·plant-1)而造成抑制作用,T13(2.65 g N、1.00 g P2O5、1.50 g K2O)是珙桐幼苗生长的最佳施肥方案。该研究构建的珙桐幼苗精准施肥模式,为珙桐种群扩繁及自然回归提供了核心技术支撑,助力濒危物种资源保育。 展开更多
关键词 珙桐幼苗 配方施肥 化学计量特征 养分积累 植物保护
暂未订购 下载PDF
四川大相岭珙桐生境温度的海拔变化特征 认领 引用
15
作者 李欣蕾 肖蔺娟 +4 位作者 黄丹 付明霞 宋心强 刘景怡 李艳 《绵阳师范学院学报》 2026年第2期100-109,共10页
土壤温度和近地表气温是影响珙桐(Davidia involucrata)种子萌发和幼苗更新的重要因素,目前有关其时空变化的研究尚较缺乏.本研究对2021—2023年四川大相岭自然保护区珙桐垂直分布范围内,海拔1400~2400 m的土壤温度和近地表气温进行了监... 土壤温度和近地表气温是影响珙桐(Davidia involucrata)种子萌发和幼苗更新的重要因素,目前有关其时空变化的研究尚较缺乏.本研究对2021—2023年四川大相岭自然保护区珙桐垂直分布范围内,海拔1400~2400 m的土壤温度和近地表气温进行了监测,研究其沿海拔梯度变化特征及时间变化特征,以期揭示珙桐分布海拔的气候特征.结果显示:(1)珙桐生境近地表气温和土壤温度的平均最高温、最低温及均温随海拔升高线性降低,与土壤温度相比,近地表气温的极端高温普遍更高,而极端低温则相反.(2)近地表气温和土壤温度的最低温直减率相差较大,平均温度直减率和最高温直减率的峰值均出现在秋季,而最低温直减率则在春夏季较大、秋冬季较小.(3)珙桐生境近地表气温和土壤温度≥0℃、≥5℃和≥10℃的积温均随海拔升高而降低,≥5℃积温持续天数存在显著差异.(4)近地表气温年较差和土壤温度年较差均在海拔2400 m处最小,最大值则分别出现在海拔1600 m和2200 m处.因此,近地表气温与土壤温度随着海拔升高呈现出不同的变化趋势,且季节变化显著,近地表气温较土壤温度变化幅度更大. 展开更多
关键词 珙桐 生境 土壤温度 近地表气温 海拔变异 月际变异 大相岭
暂未订购 下载PDF
基于邻体竞争模型的天然珙桐群落竞争关系研究 认领 引用
16
作者 余景蕾 徐云飞 +1 位作者 任宇航 胥晓 《生态科学》 CSCD 北大核心 2026年第3期158-165,共8页
研究植物邻体竞争关系是解析物种濒危机制的重要途径。为揭示珍稀濒危植物珙桐(Davidia involucrata Baill.)的种群衰退原因,本研究聚焦其与邻近植物的竞争互作机制,选取四川省平武县天然珙桐林为研究区,运用Hegyi竞争指数改进模型系统... 研究植物邻体竞争关系是解析物种濒危机制的重要途径。为揭示珍稀濒危植物珙桐(Davidia involucrata Baill.)的种群衰退原因,本研究聚焦其与邻近植物的竞争互作机制,选取四川省平武县天然珙桐林为研究区,运用Hegyi竞争指数改进模型系统分析了珙桐种内与种间竞争强度及其变化特点。研究结果表明,(1)该地珙桐林中常见其他树种14种,其中水青冈(Fagus longipetiolata Seemen)、华中樱桃(Prunus conradinae Koehne)、灯台树(Cornus controversa Hemsl.)是珙桐的主要竞争树种。(2)珙桐的竞争压力主要来自种内,其竞争指数(CIC=12.12)大于种间竞争指数(CIH=10.03)。(3)邻体植物中落叶树种的平均株高、胸径与其土壤氮含量成显著正相关(p0.05)。(4)无论同种还是异种邻体,邻体影响半径与竞争指数间服从幂函数关系,同种植物竞争系数CIC=17.35 R-2.45,R-2=0.92(p<0.01),异种植物竞争系数CIH=8324.46 R-7.35,R-2=0.97(p<0.05)。随着影响半径的增大,竞争指数不断降低,当半径达到6 m后,竞争强度趋于稳定。上述研究结果表明平武地区珙桐的生长主要受种内竞争的限制,种内及种间竞争强度均随影响半径的增加而降低,并在6 m后趋于稳定。 展开更多
关键词 珙桐 种内竞争 种间竞争 邻体影响半径 邻体竞争模型
暂未订购 下载PDF
珍稀濒危植物珙桐扦插繁殖技术 认领 引用 被引量：1
17
作者 佘生斌 李小华 +4 位作者 李海俊 王峥嵘 叶霖晓 郭敏 郑晓琴 《林业科技》 2026年第1期1-4,共4页
为了探明珙桐繁殖主要影响因素及最佳常规繁殖技术,突破珙桐扦插繁殖瓶颈,本研究采用河沙和腐殖质两种基质、根际萌蘖和主干截断后萌发1 a生枝条两种插穗,通过ABT生根粉6号不同浓度设3次重复随机区组排列进行了试验。结果表明,基质和插... 为了探明珙桐繁殖主要影响因素及最佳常规繁殖技术,突破珙桐扦插繁殖瓶颈,本研究采用河沙和腐殖质两种基质、根际萌蘖和主干截断后萌发1 a生枝条两种插穗,通过ABT生根粉6号不同浓度设3次重复随机区组排列进行了试验。结果表明,基质和插穗不同处理方法对愈伤组织和根系形成有一定影响,不同浓度的ABT生根粉处理可以促进珙桐扦插快速愈合并生根,其中200PPM的ABT处理效果最好,其次是300PPM、100PPM的最差。不同扦插基质河沙苗床好于穴盘腐殖质。经方差分析检验对比,200PPM的ABT处理的根萌蘖条扦插于河沙苗床基质上的效果最好,成活率最高可达70%。 展开更多
关键词 珙桐 基质 插穗 扦插繁殖 方差分析
暂未订购 下载PDF
湖南小溪保护区珙桐群落优势种生态位·种间关系及群落稳定性 认领 引用
18
作者 宿林祺 周清 田永祥 《安徽农业科学》 CAS 2026年第3期121-128,共8页
为探究湖南省小溪国家级自然保护区珙桐群落物种生态位、种间关系以及群落稳定性特征,基于样方调查数据,采用生态位分析、总体关联性分析(VR)、Spearman秩相关检验、Pearson相关性检验、M.Godron群落稳定性分析等方法对珙桐群落优势种... 为探究湖南省小溪国家级自然保护区珙桐群落物种生态位、种间关系以及群落稳定性特征,基于样方调查数据,采用生态位分析、总体关联性分析(VR)、Spearman秩相关检验、Pearson相关性检验、M.Godron群落稳定性分析等方法对珙桐群落优势种进行研究。结果表明:珙桐生态位宽度在调查群落各林层中均为最大,重要值较高,占有显著优势,但实生苗更新不足;珙桐与各林层优势种均构成生态位重叠,但重叠程度中等偏高(乔木0.51,灌木0.50);乔木层总体联结性呈不显著负联结,种间联结较为松散,趋于独立,灌木层呈显著正联结,种间联结紧密;Spearman秩、Pearson相关性检验中乔木层显著率均为8.8%,灌木层分别为9.04%和7.62%,检验结果与生态位重叠值呈显著线性相关;珙桐在乔木层与灯台树、西南红山茶,在灌木层与朱砂根呈显著正相关,各林层均无与珙桐呈显著负相关物种;乔(灌)木层欧式距离分别为20.19(18.13),距群落稳定点尚有一定距离,推测群落处于结构尚未稳定的演替中期阶段。 展开更多
关键词 珙桐 生态位 种间联结性 种间相关性 群落稳定性
暂未订购 下载PDF
Genomic vulnerability assessment reveals the potential benefits of adaptive introgression by mitigating the maladaptive risk of admixed populations 认领 引用
19
作者 Wen-Hao Li Han-Yang Lin +3 位作者 Chen Chen Chen-Feng Lin Xing-Xing Shen Yun-Peng Zhao 《Forestry Research》 2025年第1期59-68,共10页
As climate change accelerates,plant species largely rely on genetic variation to adapt and survive when they fail to track their ecological niches through range shifts.Predicted genomic vulnerability is able to identi... As climate change accelerates,plant species largely rely on genetic variation to adapt and survive when they fail to track their ecological niches through range shifts.Predicted genomic vulnerability is able to identify populations lacking the necessary genetic variation for climate change adaptation.However,the role of introgression in genomic vulnerability remains poorly explored.Here,we used the dove tree(Davidia involucrata),a relict species native to southwestern China,to test whether introgression may reduce genomic vulnerability.By integrating population genomics and environmental data collected from 196 individuals of 18 populations,we identified 747 strictly climate-associated loci across the distribution range of D.involucrata,138 of which were recovered from the genetically admixed populations.We estimated the genomic vulnerability for three genetic lineages and two admixed groups using the gradient forest approach,and found that eastern populations are likely to be at higher risk.The eastern admixed populations exhibited a significant reduction,with introgression from the southern lineage.Cumulative importance analysis showed moderate importance for introgressive loci along environmental gradients.This indicates that the introduction of novel alleles through introgression provides only a partial and insufficient counterbalance to the maladaptation observed in D.involucrata under climate change.Our study highlights the role of intraspecific introgression in response to climate change and emphasizes the importance of genomic vulnerability studies in informing conservation practices for relict and endangered species. 展开更多
关键词 adaptive introgression plant species genomic vulnerability genetic variation dove tree davidia involucrata climate change
暂未订购 下载PDF
马边大风顶保护区珙桐种群分布及其影响因素 认领 引用 被引量：1
20
作者 刘婷婷 罗欢 +5 位作者 黄耀华 付励强 蒲冠桦 尹华康 毛泽恩 张晋东 《生态学杂志》 CAS CSCD 北大核心 2025年第8期2598-2607,共10页
以四川马边大风顶国家级自然保护区珙桐(Davidia involucrata)为研究对象,分析了该区珙桐的种群数量、年龄结构、空间分布特征,探讨其主要影响因子,并利用最大熵模型(MaxEnt)对珙桐种群生境适宜分布及其影响因素进行模拟分析。结果表明:... 以四川马边大风顶国家级自然保护区珙桐(Davidia involucrata)为研究对象,分析了该区珙桐的种群数量、年龄结构、空间分布特征,探讨其主要影响因子,并利用最大熵模型(MaxEnt)对珙桐种群生境适宜分布及其影响因素进行模拟分析。结果表明:(1)珙桐资源较丰富,适宜生境面积11666.73 hm2,接近保护区面积1/3,估算约27510株,大多数个体处于生理成熟年龄,幼苗和幼树数量明显偏少,年龄结构呈现典型的倒金字塔型,种群属于衰退型种群;(2)主要沿河流沟谷两侧分布,在海拔1000~2200 m内均有分布,主要分布于海拔1200~2200 m;(3)距河流的距离、海拔、年温差是主要影响因子,适宜生境条件为:距河流0~250 m,海拔1200~1900 m,年温差26.2~27.2℃;(4)采笋和放牧作为主要人为干扰,极大破坏了珙桐种群的生存环境,阻碍了珙桐种子萌发及植株的生长,影响了种群自然更新。建议在马边大风顶保护区开展试点,加强珙桐种质资源保护,进一步开展珙桐繁育试验、种群更新及创新开发与利用等相关研究,对自然更新困难的幼苗实行人工抚育,促进种群延续。规划采笋和放牧区域,规范保护区周边居民的采笋、放牧行为,减少林下人为干扰。条件成熟后可扩展到整个凉山山系,这是珙桐种群保护的重要环节。 展开更多
关键词 珙桐 最大熵模型 凉山山系 人为干扰
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 11 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈