Quantifying foliar trait variation and covariation in sun and shade leaves using leaf spectroscopy in eastern North America  

作　　者：Zhihui Wang Philip A.Townsend Eric L.Kruger Anna K.Schweiger 

机构地区：[1]Guangdong Provincial Key Laboratory of Remote Sensing and Geographical Information System,Guangdong Open Laboratory of Geospatial Information Technology and Application,Guangzhou Institute of Geography,Guangdong Academy of Sciences,Guangzhou,510070,China [2]Department of Forest and Wildlife Ecology,University of Wisconsin-Madison,1630 Linden Drive,Madison,WI,53706,USA [3]Department of Land Resources and Environmental Sciences,Montana State University,334 Leon Johnson Hall,Bozeman,MT,59717,USA

出　　处：《Forest Ecosystems》2024年第5期728-742,共15页森林生态系统（英文版）

基　　金：supported by National Natural Science Foundation of China (42001305);Guangdong Basic and Applied Basic Research Foundation (2022A1515011459);GDAS'Special Project of Science and Technology Development (2020GDASYL-20200102001);Guangzhou Basic and Applied Basic Research Foundation (2023A04J1534) to Z.W.;the US National Science Foundation (NSF) Macrosystems Biology and NEON-Enabled Science grant 1638720 to P.A.T.,and E.L.K.;NSF Biology Integration Institute award ASCEND,DBI-2021898 to P.A.T.

摘　　要：Characterizing foliar trait variation in sun and shade leaves can provide insights into inter-and intra-species resource use strategies and plant response to environmental change.However,datasets with records of multiple foliar traits from the same individual and including shade leaves are sparse,which limits our ability to investigate trait-trait,trait-environment relationships and trait coordination in both sun and shade leaves.We presented a comprehensive dataset of 15 foliar traits from sun and shade leaves sampled with leaf spectroscopy,including 424 individuals of 110 plant species from 19 sites across eastern North America.We investigated trait variation,covariation,scaling relationships with leaf mass,and the effects of environment,canopy position,and taxonomy on trait expression.Generally,sun leaves had higher leaf mass per area,nonstructural carbohydrates and total phenolics,lower mass-based chlorophyll a+b,carotenoids,phosphorus,and potassium,but exhibited species-specific characteristics.Covariation between sun and shade leaf traits,and trait-environment relationships were overall consistent across species.The main dimensions of foliar trait variation in seed plants were revealed including leaf economics traits,photosynthetic pigments,defense,and structural traits.Taxonomy and canopy position collectively explained most of the foliar trait variation.This study highlights the importance of including intra-individual and intra-specific trait variation to improve our understanding of ecosystem functions.Our findings have implications for efficient field sampling,and trait mapping with remote sensing.

关 键 词：Foliar traits Leaf trait variation Trait-environment covariation Shade leaves NEON Leaf spectroscopy 

分 类 号：S718.5[农业科学—林学]