文献类型：期刊文献

中文题名：Different responses of soil respiration and its components to nitrogen and phosphorus addition in a subtropical secondary forest

作者：Junjun Zhang[1] Yong Li[2] Jinsong Wang[1] Weinan Chen[1,3] Dashuan Tian[1] Shuli Niu[1,3]

第一作者：Junjun Zhang

机构：[1]Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;[2]Beijing Key Laboratory of Wetland Services and Restoration,Institute of Wetland Research,Chinese Academy of Forestry,Beijing 100091,China;[3]Department of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China

年份：2021

卷号：8

期号：3

起止页码：491-503

中文期刊名：森林生态系统：英文版

外文期刊名：Forest Ecosystems

收录：Scopus;CSCD:【CSCD2021_2022】；PubMed;

基金：supported by National Natural Science Foundation of China(31625006,31988102 and 32001133);the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA23080302).

语种：英文

中文关键词：Nitrogen deposition;Phosphorus enrichment;Heterotrophic respiration;Autotrophic respiration;Enzyme activities;Microbial community composition

分类号：S714

摘要：Background:Nitrogen(N)and phosphorus(P)deposition have largely affected soil respiration(Rs)in forest ecosystems.However,few studies have explored how N and P individually or in combination to influence Rs and its components(autotrophic respiration,Ra;heterotrophic respiration,Rh),especially in highly P-limited subtropical forests.To address this question,we conducted a field manipulation experiment with N and/or P addition in a 50-year-old subtropical secondary forest.Results:We found that N addition on average reduced Rs,Ra,and Rh by 15.2%,15%,and 11.7%,respectively during 2-year field study.P addition had an inconsistent effect on Ra,with Ra increasing by 50.5%in the first year but reducing by 26.6%in the second year.Moreover,P addition on average decreased Rh by 8.9%–30.9%and Rs by 6.7%–15.6%across 2 years.In contrast,N and P co-addition on average increased Rs,Ra,and Rh by 1.9%,7.9%,and 2.1%during the experimental period.Though Rs and Rh were significantly correlated with soil temperature,their temperature sensitivities were not significantly changed by fertilization.Ra was predominantly regulated by soil nitrogen availability(NH4+and NO3?),soil dissolved organic carbon(DOC),and enzyme activities,while the variation in Rh was mainly attributable to changes in soil microbial community composition and soilβ-D-Cellubiosidase(CB)andβ-Xylosidase(XYL)activities.Conclusion:Our findings highlight the contrasting responses of Rs and its components to N or P addition against N and P co-addition,which should be differentially considered in biogeochemical models in order to improve prediction of forest carbon dynamics in the context of N and P enrichment in terrestrial ecosystems.