文献类型：期刊文献

英文题名：The sequence of physiological stress thresholds responses to drought in a temperate mixed forest

作者：Zhang, Rui[1,2] Wang, Chuankuan[1,2] Duan, Ruibing[1,2,3] Wang, Lele[1,2] Jin, Ying[1,2]

第一作者：Zhang, Rui

通信作者：Jin, Y[1]

机构：[1]Northeast Forestry Univ, Sch Ecol, 26 Hexing Rd, Harbin 150040, Peoples R China;[2]Northeast Forestry Univ, Key Lab Sustainable Forest Ecosyst Management, Minist Educ, 26 Hexing Rd, Harbin 150040, Peoples R China;[3]Chinese Acad Forestry, Expt Ctr Desert Forestry, Dengkou 015200, Peoples R China

年份：2025

卷号：371

外文期刊名：AGRICULTURAL AND FOREST METEOROLOGY

收录：;Scopus(收录号：2-s2.0-105005266727);WOS:【SCI-EXPANDED(收录号:WOS:001498343700002)】；

基金：This work was supported by the National Key R & D Program of China (2022YFE0127900; 2021YFD220040108) and the National Natural Science Foundation of China (31901278) . We thank the Maoershan Forest Ecosystem Research Station provided field logistic support.

语种：英文

外文关键词：Stomatal regulation; Plant hydraulics; Stomatal closure; Embolism resistance

摘要：Predicting the influence of worldwide drought on forests remains constrained by lacking of mechanistic understanding of trait interactions in defining physiological dysfunction under water stress, particularly with respect to the interaction between plant stomatal regulation and hydraulics. In this study, we investigated key stomatal and hydraulic traits of leaves and stems for 17 temperate woody species in northeastern China. We found that the stomatal closure point (the water potential at 88 % loss of maximum stomatal conductance) was positively correlated with the water potentials at leaf turgor loss, stem hydraulic conductivity, and 50 % loss of stem hydraulic conductivity. The 50 % loss of leaf hydraulic conductance of all studied species occurred before 50 % stem embolism, in agreement with the vulnerability segmentation hypothesis. Almost all studied tree species reached complete stomatal closure before 50 % stem embolism, but after the 50 % loss of leaf hydraulic conductance. Collectively, the observed sequence of water potential for key physiological dysfunctions not only facilitates carbon assimilation for as long as possible, but also helps to avoid substantial loss of the hydraulic function in woody stems with high construction costs. The interactions between stomatal regulation and multiple hydraulic traits may scale up to influence the water use of whole plants.