热带喀斯特季节性雨林12个树种木质部栓塞抗性与其解剖结构及相关性状间的关系

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中文摘要：在全球气候变化背景下，干旱诱导木质部栓塞被认为是驱动树木死亡的主要因素。因此，分析木质部栓塞抗性(用导水率损失50％的水势(P50)表示)的内在解剖决定因素对于理解其结构与功能间的机制具有重要意义，为气候变化背景下植被恢复树种选择提供理论依据。该研究测定广西弄岗喀斯特森林内12个主要常绿树种的木质部导管直径、导管组指数、组分占比、纹孔形态和纹孔膜超微结构，同时结合木质部储水特征(如木材密度和饱和含水量)，综合分析干旱诱导木质部栓塞抗性与其解剖结构以及储水特征之间的关系。结果显示:(1)Ps0与导管直径、密度、导管组指数以及组分占比间的相关性均不显著;(2)P50与纹孔形态特征以及纹孔膜厚度和纹孔腔深度等特征间的相关性均不显著;(3)P50与木材密度显著负相关，与饱和含水量边缘显著正相关，即木材密度较大、饱和含水量较低的树种表现出较强的栓塞抗性。研究结果表明，运用单一的解剖结构来评估栓塞抗性是不全面的;此外，木质部水分存储能力与栓塞抗性之间的权衡关系对于深入理解喀斯特植物耐旱性的内在结构机制以及多元化的水分利用策略具有重要的生态学意义。

外文标题：Relationship of embolism resistance with xylem anatomical structure and related traits of 12 tree species in tropical karst seasonal rainforests

外文摘要：Aims In the context of global climate change,drought-induced xylem embolism is considered as the main factor driving tree death.Therefore,analyzing the intrinsic anatomical determinants of xylem embolism resistance(water potential at 50％loss of xylem conductivity,P50)is of great significance for understanding the mechanism between its structure and function,and provides a theoretical basis for the selection of tree species for vegetation restoration in the context of climate change.Methods We measured the xylem vessel diameter,vessel grouping index,fractions of xylem tissues,pit morphology,pit membrane ultrastructure and water storage capacity(such as wood density and saturated water content),and explored the relationships between xylem embolism resistance and their anatomical structure and structural characteristics of 12 main evergreen tree species in Nonggang karst forest of Guangxi.Important findings We found that:(1)P50 had no significant correlation with vessel diameter,density,vessel grouping index and fraction of xylem tissues;(2)The correlations between P50 and pit morphology,thickness of pit membrane and depth of pit chamber were not significant;(3)P50 was negatively correlated with wood density and marginally positively correlated with saturated water content.Tree species with high wood density and low saturated water content had strong embolism resistance.The results indicated that using a single anatomical structure trait could not give out comprehensive evaluation on drought-induced embolic resistance.In addition,there was a trade-off between xylem water capacity and embolism resistance.This result was of great ecological significance for deeply understanding the internal structural mechanism of drought tolerance and diversified water use strategies of karst plants.

外文关键词：

wood densitysaturated water contentxylem vesselpitpit membrane

作者：

马琳、巢林、何雨莎、李忠国、王爱华、刘晟源、胡宝清、刘艳艳

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作者单位：

南宁师范大学地理与海洋研究院,北部湾环境演变与资源利用教育部重点实验室,广西地表过程与智能模拟重点实验室,南宁 530001

中国林业科学研究院热带林业实验中心,广西友谊关森林生态系统国家定位观测研究站,广西凭祥 532600

广西弄岗国家级自然保护区管理中心,广西龙州 532400

关键词：

木材密度饱和含水量木质部导管纹孔纹孔膜

基金：

国家自然科学基金国家自然科学基金中央引导地方科技发展专项中央引导地方科技发展专项中国博士后科学基金广西自然科学基金广西自然科学基金南宁师范大学科研启动基金北部湾环境演变与资源利用教育部重点实验室(南宁师范大学)开发或系统基金

项目编号：

3180033332160252桂科AD19245133桂科AD202380782019M663870XB2018GXNSFBA1380092018GXNSFAA281277602021239137GTEU-KLOP-X1709

出版年：

2024

DOI：

10.17521/cjpe.2024.0016

植物生态学报

中国科学院植物研究所　中国植物学会

植物生态学报

CSTPCD北大核心

影响因子：2.162

ISSN：1005-264X

年,卷(期)：2024.48(7)