几种评价植物水分调节策略的方法对比——以毛白杨为例  

Comparison of Several Methods for Evaluating Plant Water Regulation Strategies——A Case Study of Populus tomentosa

作　　者：王傲宇 郭有正 邓坦 刘洋[1] 邸楠 段劼[1] 李熙萌[4] 席本野[1] Wang Aoyu;Guo Youzheng;Deng Tan;Liu Yang;Di Nan;Duan Jie;Li Ximeng;Xi Benye(Ministry of Education Key Laboratory of Silviculture and Conservation,Beijing Forestry University,Beijing 100083;Henan Forestry Resources Monitoring Institute,Zhengzhou 450045;School of Ecology and Environment,Inner Mongolia University,Hohhot 010070;College of Life and Environmental Science,Minzu University of China,Beijing 100081)

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室,北京100083 [2]河南省林业资源监测院,郑州450045 [3]内蒙古大学生态与环境学院,呼和浩特010070 [4]中央民族大学生命与环境科学学院,北京100081

出　　处：《林业科学》2024年第8期109-119,共11页Scientia Silvae Sinicae

基　　金：国家自然科学基金项目(32171763,31971640,31872702);国家重点研发计划项目(2021YFD2201203);北京林业大学“5·5工程”科研创新团队项目(BLRC2023C05)。

摘　　要：【目的】探究不同植物水分调节策略评价结果的差异,明确最佳的植物水分调节策略评价方法,为精准评价植物水分调节策略提供方法学参考,也为深入了解速生树种在水分亏缺立地下生长的生理机制提供理论依据。【方法】以毛白杨为试验材料,在不同土壤水分条件下(充分滴灌、不灌溉)和不同季节间(旱季、雨季)比较4种不同定量评价植物水分调节策略的方法并分析其适用性。【结果】1)不同土壤水分不同季节条件下,水力学面积与日最大叶片水势差法对毛白杨水分调节策略的评价结果相同,均为不灌溉处理相较于灌溉处理更偏等水调节,旱季相较于雨季更偏等水调节策略,符合本研究所提出的“一致性”与“相同性”水分调节策略评价原则。2)利用叶片正午水势与水汽压亏缺间关系斜率法(K_(ΨMD-VPD))来评价植物水分调节策略时,不同季节与不同灌溉处理间所得出的水分调节策略结果不一致。3)用黎明前-正午叶水势间关系斜率法(K_(ΨPD-ΨMD))评价毛白杨水分调节策略时,不灌溉处理下不同季节间评价结果与其他方法一致,灌溉处理下季节间评价结果与其他方法相反。因此,K_(ΨMD-VPD)与K_(ΨPD-ΨMD)法均不满足上述提出的两点性原则。【结论】水力学面积法与叶片水势差法对毛白杨水分调节策略的评价结果较为准确,是理想的毛白杨水分调节策略的评价方法,K_(ΨPD-ΨMD)法K_(ΨMD-VPD)法不适用于评价毛白杨水分调节策略。【Objective】Plant water regulation strategy,defined as the response of plants under environmental water deficit,plays a crucial role in plant adaptation to stressed environment.Accurately evaluating plant water regulation strategies is instrumental to elaborate the water use characteristics of plants and comprehensively understand the water relations of plants,thereby revealing the adaptive strategies of plants to drought.However,current methods for accurately quantifying and evaluating plant water regulation strategies remains controversial.The objective of this study is to explore and assess the methods for accurately evaluating plant water regulation strategies,so as to provide theoretical basis for a deeper understanding of the physiological mechanisms of fast-growing tree species growing under water deficit sites.【Method】Populus tomentosa(B301)was used as the experimental material.Trees were subjected to two different soil water gradients(full irrigation and no irrigation)in different seasons(dry season and wet season),and suitability of different methods quantifying plant water regulation strategy was contrasted and analyzed.【Result】1)The evaluation results of the plant water regulation strategy of P.tomentosa with hydroscape area(HSA)and daily maximum difference between predawn and midday leaf water potential under well-watered conditions(ΔΨ)were the same across different soil moisture conditions and different seasons.The results of both methods showed that the water regulation strategy of non-irrigated treatment was more isohydric than that of the irrigation treatment,and the water regulation strategy of dry season was more isohydric than that of the wet season.The results were in line with the evaluation principles of"consistency"and"homogeneity"water regulation strategies proposed in this study.2)When the slope method of the relationship between leaf noon water potential and water vapor pressure deficit(K_(ΨMD-VPD))was used to evaluate plant water regulation strategies,the results of water

关 键 词：水分关系 水力学面积 等水/非等水行为 水分管理 杨树 

分 类 号：S718.43[农业科学—林学]