文献类型：期刊文献

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

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

第一作者：Zhang, Junjun

通信作者：Wang, JS[1];Niu, SL[1]

机构：[1]Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosystem Network Observat & Modeling, Beijing 100101, Peoples R China;[2]Chinese Acad Forestry, Beijing Key Lab Wetland Serv & Restorat, Inst Wetland Res, Beijing 100091, Peoples R China;[3]Univ Chinese Acad Sci, Dept Resources & Environm, Beijing 100049, Peoples R China

年份：2021

卷号：8

期号：1

外文期刊名：FOREST ECOSYSTEMS

收录：;Scopus(收录号：2-s2.0-85107523648);WOS:【SCI-EXPANDED(收录号:WOS:000658759000001)】；

基金：This study was 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

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

摘要：Background Nitrogen (N) and phosphorus (P) deposition have largely affected soil respiration (R-s) in forest ecosystems. However, few studies have explored how N and P individually or in combination to influence R-s and its components (autotrophic respiration, R-a; heterotrophic respiration, R-h), 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 R-s, R-a, and R-h by 15.2%, 15%, and 11.7%, respectively during 2-year field study. P addition had an inconsistent effect on R-a, with R-a increasing by 50.5% in the first year but reducing by 26.6% in the second year. Moreover, P addition on average decreased R-h by 8.9%-30.9% and R-s by 6.7%-15.6% across 2 years. In contrast, N and P co-addition on average increased R-s, R-a, and R-h by 1.9%, 7.9%, and 2.1% during the experimental period. Though R-s and R-h were significantly correlated with soil temperature, their temperature sensitivities were not significantly changed by fertilization. R-a was predominantly regulated by soil nitrogen availability (NH4+ and NO3-), soil dissolved organic carbon (DOC), and enzyme activities, while the variation in R-h was mainly attributable to changes in soil microbial community composition and soil beta-D-Cellubiosidase (CB) and beta-Xylosidase (XYL) activities. Conclusion Our findings highlight the contrasting responses of R-s 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.