Leaf habit differentiation explains trait tradeoffs across savanna woody plants  

作　　者：Yangsiding Wang Da Yang German Vargas G. Guangyou Hao Jennifer S.Powers Yan Ke Qin Wang Yunbing Zhang Jiaolin Zhang 

机构地区：[1]CAS Key Laboratory of Tropical Forest Ecology,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Mengla,Yunnan 666303,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Biological Sciences,University of Utah,Salt Lake City,UT 84112,USA [4]CAS Key Laboratory of Forest Ecology and Management,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China [5]Department of Ecology,Evolution and Behavior,University of Minnesota,St Paul,MN 55108,USA

出　　处：《Forest Ecosystems》2024年第3期287-295,共9页森林生态系统（英文版）

基　　金：funded by the National Natural Science Foundation of China (31901285, 32171507, 31870385, 32301308);the CAS“Light of West China”programs to DY and JLZ;the Yunnan Fundamental Research Projects (202001AU070128, 202401AT070230);the 14th Five-Year Plan of the Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences (XTBG-1450101);German Vargas G. was supported by the NOAA Climate and Global Change Postdoctoral Fellowship Program;administered by UCAR's Cooperative Programs for the Advancement of Earth System Science (CPAESS) under the NOAA Science Collaboration Program award#NA21OAR4310383。

摘　　要：Identifying how leaf habit subdivisions link to the fast–slow and avoidance–tolerance trait tradeoffs can provide new insight into divergence in ecophysiological strategies among plant functional groups. Here, we tested a hypothesis that the differentiation across deciduous, semi-deciduous and evergreen woody species contributes to physiological trait tradeoffs in a dry-hot valley savanna. We investigated 11 photosynthetic, morphological and hydraulic traits of 24 species including 8 deciduous, 10 semi-deciduous and 6 evergreen species. Deciduous species were grouped in the fast and avoidance side associated with high values of maximum photosynthetic rates,stomatal conductance and leaf size, while evergreen species were grouped in the slow and tolerance side associated with high photosynthetic water use efficiency, leaf mass per area, sapwood density, Huber value, leaf water potential at turgor loss point and water potential causing 50% loss of stem hydraulic conductance. Semideciduous species generally had intermediate trait values and represented different physiological characteristics when compared to deciduous and evergreen species. The physiological trait tradeoffs showed a close linkage to the differentiation of these three leaf habits. Our findings clearly reveal trait tradeoffs related to fast–slow and avoidance–tolerance strategies among diverse savanna plants, suggesting a syndrome in multiple ecophysiology strategies across different leaf habits.

关 键 词：Dry-hot habitat Gas exchange Hydraulics PHENOLOGY Tolerance Valley savanna 

分 类 号：S718.5[农业科学—林学]