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Hydraulic strategies of Cunninghamia lanceolata under drought are shaped by native drought conditions 认领 引用
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作者 Jian Feng Yuan Yao +3 位作者 Yue He Pei Wang Hanying Hu Sheng Zhang 《Forestry Research》 2025年第1期1-13,共13页
Cunninghamia lanceolata is integral to soil conservation,climate regulation,and biodiversity maintenance,yet its ecological functions are threatened by drought.Functional trait trade-offs underpin hydraulic safety,but... Cunninghamia lanceolata is integral to soil conservation,climate regulation,and biodiversity maintenance,yet its ecological functions are threatened by drought.Functional trait trade-offs underpin hydraulic safety,but the plasticity of hydraulic strategies in C.lanceolata remains poorly understood.Here,the historical intensity of drought across different C.lanceolata regions were quantified using the Temperature Vegetation Dryness Index(TVDI)derived from satellite remote sensing.Seedlings sourced from these regions were subjected to drought under greenhouse conditions,and then water status,physiological traits,and metabolic responses were assessed to elucidate hydraulic strategies.The results revealed that TVDI effectively captured regional drought patterns,with the Dechang region experiencing the highest drought intensity,followed by the Hongya and Shiyan regions.The seedlings exhibited distinct hydraulic responses under drought stress.The highest drought-originated seedlings maintained a stable leaf water status,imposed stricter regulation of stomatal and biomass,and accumulated higher levels of antioxidants and defense compounds,indicative of a conservative strategy.In contrast,the low drought-originated seedlings showed greater fluctuations in leaf water content and potential,retained more aboveground biomass,and accumulated fewer defense compounds,reflecting an acquisitive strategy.The moderate drought-originated seedlings adopted an intermediate strategy,balancing growth and antioxidant accumulation.Overall,as the intensity of the drought increased across the provenances,C.lanceolata shifted from an acquisitive to a conservative hydraulic strategy.By linking provenance-specific drought regimes with physiological and metabolic responses,this study provides new insights into drought resistance mechanisms and informs species selection and forest management under climate change. 展开更多
关键词 plasticity hydraulic strategies temperature vegetation dryness index historical intensity drought cunninghamia lanceolata temperature vegetation dryness satellite remote sensingseedlings drought resistance hydraulic strategies
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孔源性视网膜脱离术后黄斑区微循环和微结构改变与视功能的相关性 认领 引用 被引量：4
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作者 苏晓涵 柴宛璇 +1 位作者 胡寒英 游志鹏 《中华眼视光学与视觉科学杂志（中英文）》 CAS CSCD 北大核心 2024年第8期604-611,共8页
目的:探讨累及黄斑区的孔源性视网膜脱离(RRD)患者视网膜复位术后黄斑区微循环和微结构改变与视功能变化的相关性。方法:回顾性系列病例研究。随机选取2022年6—12月在南昌大学附属眼科医院接受经睫状体平坦部玻璃体切割手术(PPV)并成... 目的:探讨累及黄斑区的孔源性视网膜脱离(RRD)患者视网膜复位术后黄斑区微循环和微结构改变与视功能变化的相关性。方法:回顾性系列病例研究。随机选取2022年6—12月在南昌大学附属眼科医院接受经睫状体平坦部玻璃体切割手术(PPV)并成功复位的累及黄斑区的RRD患者30例(60眼),均为单眼发病。手术后随访半年,于术前、硅油注入后3个月及硅油取出后3个月进行最佳矫正视力(BCVA)检查,并于硅油注入后3个月及硅油取出后3个月使用MP-3微视野对黄斑区平均视敏度(MS)和固视稳定度进行检查。采用光学相干断层扫描血管成像技术(OCTA)检查视网膜浅层毛细血管黄斑中心凹无血管区(FAZ)面积、形态指数,黄斑区视网膜浅层毛细血管长度密度(VSCP)和视网膜浅层毛细血管灌注密度(PSCP)等黄斑区微循环情况;采用光学相干断层扫描技术(OCT)检查是否存在黄斑下积液(SMF)、黄斑前膜(ERM)、黄斑囊样水肿(CME)以及椭圆体带(EZ)和外界膜(ELM)连续性中断等黄斑区微结构改变。采用秩和检验、卡方检验、t检验等对数据进行分析,术后视功能与黄斑区微循环和微结构改变之间的相关性采用Spearman相关分析。结果:所有患者术后视网膜一次性复位。患眼硅油取出术后BCVA(LogMAR)较术前提高(Z=-4.78,P<0.001);患眼MS在硅油注入术后较对侧眼明显下降(Z=-5.59,P<0.001),在硅油取出术后逐渐上升(Z=-3.55,P<0.001)。患眼FAZ面积在硅油注入术后和硅油取出术后较对侧眼均扩大(Z=-2.63,P=0.010;Z=-2.03,P=0.040);PSCP和VSCP在硅油注入术后均明显小于对侧眼(Z=-3.11,P=0.002;Z=-3.80,P<0.001),在硅油取出术后均明显上升(Z=-3.37,P=0.001;Z=-4.14,P=0.003)。EZ和ELM连续性中断发生率在硅油取出术后较硅油注入术后明显下降(χ2=6.70,P=0.010;χ2=4.80,P=0.030)。硅油取出后视功能与FAZ面积、PSCP、VSCP、EZ和ELM的连续性均有相关性(均P<0.05);黄斑区PSCP、VSCP与FAZ面积均呈负相关(r=-0.56,P=0.001;r=-0.58,P=0.001)。结论:RRD患者PPV术后FAZ面积明显降低,PSCP、VSCP在硅油注入后明显降低,硅油取出后恢复正常,PPV术后视功能与FAZ面积、黄斑区PSCP、VSCP以及EZ和ELM的连续性具有相关关系。 展开更多
关键词 视网膜脱离 光学相干断层扫描血管成像 光学相干断层扫描 黄斑区微结构 视功能 微视野
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