Experimental warming shifts coupling of carbon and nitrogen cycles in an alpine meadow

作     者：Song Wang Quan Quan Cheng Meng Weinan Chen Yiqi Luo Shuli Niu Song Wang;Quan Quan;Cheng Meng;Weinan Chen;Yiqi Luo;Shuli Niu

作者机构：Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural ResearchChinese Academy of SciencesBeijing 100101China College of Resources and EnvironmentUniversity of Chinese Academy of SciencesBeijing 100049China Center for Ecosystem Science and SocietyNorthern Arizona UniversityFlagstaffAZ 86011USA 

出 版 物：《Journal of Plant Ecology》 (植物生态学报（英文版）)

年 卷 期：2021年第14卷第3期

页      面：541-554页

核心收录：

学科分类：090503[农学-草业科学] 0909[农学-草学] 0905[农学-畜牧学] 09[农学] 0903[农学-农业资源与环境] 

基　　金：This study was financially supported by the National Natural Science Foundation of China(31625006,31988102) the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA23080302) the International Collaboration Project of Chinese Academy of Sciences(131A11KYSB20180010) 

主　　题：Bayesian probabilistic inversion Markov-Chain Monte-Carlo(MCMC) warming carbon and nitrogen cycles stoichiometry alpine meadow 

摘      要：Aims Terrestrial ecosystem carbon(C)uptake is remarkably regulated by nitrogen(N)availability in the ***,the coupling of C and N cycles,as reflected by C:N ratios in different components,has not been well explored in response to climate *** Here,we applied a data assimilation approach to assimilate 14 datasets collected from a warming experiment in an alpine meadow in China into a grassland ecosystem *** attempted to evaluate how experimental warming affects C and N coupling as indicated by constrained parameters under ambient and warming treatments *** Findings The results showed that warming increased soil N availability with decreased C:N ratio in soil labile C pool,leading to an increase in N uptake by ***,C input to leaf increased more than N,leading to an increase and a decrease in the C:N ratio in leaf and root,*** C:N ratio was decreased due to the increased N immobilization under high soil N availability or warming-accelerated decomposition of litter *** also increased C:N ratio of slow soil organic matter pool,suggesting a greater soil C sequestration *** most models usually use a fixed C:N ratio across different environments,the divergent shifts of C:N ratios under climate warming detected in this study could provide a useful benchmark for model parameterization and benefit models to predict C-N coupled responses to future climate change.