Degree of shade tolerance shapes seasonality of chlorophyll,nitrogen and phosphorus levels of trees and herbs in a temperate deciduous forest

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外文摘要：Forest productivity is closely linked to seasonal variations and vertical differentiation in leaf traits.How-ever,leaf structural and chemical traits variation among co-existing species,and plant functional types within the canopy are poorly quantified.In this study,the seasonal-ity of leaf chlorophyll,nitrogen(N),and phosphorus(P)were quantified vertically along the canopy of four major tree species and two types of herbs in a temperate deciduous forest.The role of shade tolerance in shaping the seasonal variation and vertical differentiation was examined.Dur-ing the entire season,chlorophyll content showed a distinct asymmetric unimodal pattern for all species,with greater chlorophyll levels in autumn than in spring,and the tim-ing of peak chlorophyll per leaf area gradually decreased as shade tolerance increased.Chlorophyll a:b ratios gradually decreased with increasing shade tolerance.Leaf N and P contents sharply declined during leaf expansion,remained steady in the mature stage and decreased again during leaf senescence.Over the seasons,the lower canopy layer had significantly higher chlorophyll per leaf mass but not chlo-rophyll per leaf area than the upper canopy layer regardless of degree of shade tolerance.However,N and P per leaf area of intermediate shade-tolerant and fully shade-tolerant tree species were significantly higher in the upper canopy than in the lower.Seasonal variations in N:P ratios suggest changes in N or P limitation.These findings indicate that shade tolerance is a key feature shaping inter-specific differ-ences in leaf chlorophyll,N,and P contents as well as their seasonality in temperate deciduous forests,which have sig-nificant implications for modeling leaf photosynthesis and ecosystem production.

外文关键词：

Leaf traitsLeaf nutrientsSeasonal variationsChlorophyllNitrogenPhosphorusShade toleranceCanopy layers

作者：

Jiajia Zeng、Fan Liu、Yuan Zhu、Jiayi Li、Ying Ruan、Xiankui Quan、Chuankuan Wang、Xingchang Wang、Yanbo Hu

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作者单位：

Aulin College,Northeast Forestry University,Harbin 150040,People's Republic of China

Center for Ecological Research,Northeast Forestry University,Harbin 150040,People's Republic of China

Key Laboratory of Agricultural Water Resources,Center for Agricultural Resources Research,Institute of Genetics and Developmental Biology,Chinese Academy of Sciences,Shijiazhuang 050021,People's Republic of China

Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,People's Republic of China

Key Laboratory of Sustainable Forest Ecosystem Management,Ministry of Education,Northeast Forestry University,Harbin 150040,People's Republic of China

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基金：

National Natural Science Foundation of China

项目编号：

32171765

出版年：

2024

DOI：

10.1007/s11676-024-01703-z

林业研究(英文版)

东北林业大学,中国生态学学会

林业研究(英文版)

CSTPCDEI

影响因子：0.365

ISSN：1007-662X

年,卷(期)：2024.35(4)