文献类型：期刊文献

英文题名：Leaf trait expression varies with tree size and ecological strategy in a subtropical forest

作者：Bin, Yue[1,2] Li, Yanpeng[3] Russo, Sabrina E.[4,5] Cao, Honglin[1,2] Ni, Yunlong[1,2] Ye, Wanhui[1,2] Lian, Juyu[1,2]

第一作者：Bin, Yue

通信作者：Lian, JY[1];Lian, JY[2]

机构：[1]Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Ec, Guangdong Prov Key Lab Appl Bot, South China Bot Garden, Guangzhou, Peoples R China;[2]Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou, Peoples R China;[3]Chinese Acad Forestry, Forest Ecol Res Ctr, Res Inst Trop Forestry, Guangzhou, Peoples R China;[4]Univ Nebraska, Sch Biol Sci, Lincoln, NE USA;[5]Univ Nebraska, Ctr Plant Sci Innovat, Lincoln, NE USA

年份：2022

卷号：36

期号：4

起止页码：1010-1022

外文期刊名：FUNCTIONAL ECOLOGY

收录：;Scopus(收录号：2-s2.0-85123117941);WOS:【SCI-EXPANDED(收录号:WOS:000744680400001)】；

基金：Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Grant/Award Number: GML2019ZD0408; Strategic Priority Research Program of the Chinese Academy of Sciences, Grant/Award Number: XDB31030000; National Natural Science Foundation of China, Grant/Award Number: 31300455; National Key R&D Program of China, Grant/Award Number: 2017YFC0505802; Chinese Forest Biodiversity Monitoring Network

语种：英文

外文关键词：body size; leaf functional traits; ontogeny; phenotypic plasticity; vertical environmental variation

摘要：1. How the dramatic vertical environmental gradients in closed canopy forests shape intraspecific variation in the functional traits of tree species and their ecological strategies is not well understood. In an Asian subtropical forest, we tested the hypothesis that, because species' maximum height and shade tolerance determine the lifetime environmental variation of a tree, they should be correlated with the magnitude of intraspecific variation in leaf traits and how strongly it depends on tree size. 2. We collected data on three vertical environmental variables, tree size and four leaf traits of 3,880 trees of 24 species in a subtropical forest. Air temperature and relative humidity displayed linear, and insolation displayed nonlinear, variation with height above-ground. Intraspecific trait variation (ITV) varied significantly among species, for all but one understorey tree species, and also varied with tree size for at least one trait. Many trait-size relationships were nonlinear with inflection points near the height where insolation dramatically increased. While ITV did not correlate with species' maximum height nor shade tolerance, the amount of ITV explained by size (SDTV) and the rate of change in trait expression with size did. 3. Greater ITV is thought to be associated with greater environmental heterogeneity, and yet strong evidence supporting this has not always been found. Our findings shed new light on how trait plasticity is phenotypically integrated with tree species' ecological strategy by pointing to the importance of accounting for tree size, since SDTV, rather than ITV, was associated with strategy variation in maximum height and shade tolerance. 4. Our study improves understanding of tree size's effect on leaf trait expression, and implies that SDTV is not only a key mechanism promoting interspecific variation in tree stature, contributing to species coexistence via vertical niche partitioning, but is also likely to influence the effects of climate change on forests by constraining tree responses to vertical environmental gradients.