Linking nutrient resorption stoichiometry with plant growth under long-term nitrogen addition

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外文摘要：Increased nitrogen(N)input can potentially lead to secondary phosphorus(P)limitation;however,it remains unclear whether differences in the plant's ability to cope with this P deficiency are related to their growth re-sponses.Using a long-term experiment of N addition in a boreal forest,we explored the potential role of plant nutrient resorption efficiency and its stoichiometry in mediating plant growth responses to increased N input.We recorded the cover and measured the concentration and resorption efficiency of leaf N and P as well as the photosynthesis of a grass Deyeuxia angustifolia and a shrub Vaccinium vitis-idaea.The cover of the grass D.angustifolia increased with increasing N addition,while that of the shrub V.vitis-idaea decreased with N addition rate and almost disappeared from the high-level N addition over time.P resorption efficiency(PRE)increased in D.angustifolia but decreased in V.vitis-idaea with increasing leaf N∶P which was increased by N addition for both species.In addition,photosynthesis increased linearly with N resorption efficiency(NRE)and PRE but was better explained by NRE:PRE,changing nonlinearly with the ratio in a hump-shaped trend.Furthermore,the variance(CV)of NRE:PRE for V.vitis-idaea(123％)was considerably higher than that for D.angustifolia(29％),indicating a more stable nutrient resorption stoichiometry of the grass.Taken together,these results highlight that efficient P acquisition and use strategy through nutrient resorption processes could be a pivotal underlying mechanism driving plant growth and community composition shifts under N enrichment.

外文关键词：

Nitrogen depositionUnderstory layerCommunity shiftNutrient limitationPhosphorus resorption efficiencyStoichiometric homeostasis

作者：

Aijun Xing、Haihua Shen、Longchao Xu、Mengying Zhao、Zhengbing Yan、Jingyun Fang

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作者单位：

State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Beijing,100093,China

University of Chinese Academy of Sciences,Beijing,100049,China

College of Ecology,Taiyuan University of Technology,Shanxi,030024,China

Institute of Ecology,College of Urban and Environmental Sciences,and Key Laboratory for Earth Surface Processes of the Ministry of Education,Peking University,Beijing,100871,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaKey Research Program of Frontier Sciences,CASChina Postdoctoral science Foundationpostdoctoral fellowship program of CPSF

项目编号：

3198810232301390QYZDY-SSW-SMC0112022T150697number GZC20240856

出版年：

2024

DOI：

10.1016/j.fecs.2024.100221

森林生态系统(英文版)

北京林业大学

森林生态系统(英文版)

CSTPCD

影响因子：0.09

ISSN：2095-6355

年,卷(期)：2024.11(5)