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Nitrogen addition reduces soil respiration but increases the relative contribution of heterotrophic component in an alpine meadow

文献类型：期刊论文

作者Wang, Jinsong1; Song, Bing1,5; Ma, Fangfang1,5; Tian, Dashuan1; Li, Yong2; Yan, Tao3; Quan, Quan1,5; Zhang, Fangyue1,5; Li, Zhaolei1; Wang, Bingxue1
刊名FUNCTIONAL ECOLOGY
出版日期2019-08-28
页码15
关键词nitrogen addition gradient nonlinear response plant community composition sensitivity soil respiration components soil substrate quality soil temperature
ISSN号0269-8463
DOI10.1111/1365-2435.13433
通讯作者Niu, Shuli(sniu@igsnrr.ac.cn)
英文摘要Disentangling the relative response sensitivity of soil autotrophic (R-a) and heterotrophic respiration (R-h) to nitrogen (N) enrichment is pivotal for evaluating soil carbon (C) storage and stability in the scenario of intensified N deposition. However, the mechanisms underlying differential sensitivities of R-a and R-h and relative contribution of R-h to soil respiration (R-s) with increasing N deposition remain elusive. A manipulative field experiment with multi-level N addition rates was conducted over 3 years (2015-2017) in an alpine meadow to explore the relative impact of N enrichment on R-a and R-h and the response of R-h/R-s ratio to the gradient of N addition. Soil respiration components had different sensitivities to N enrichment, with R-a decreasing more than R-h, leading to a higher R-h/R-s ratio as a function of increasing N addition rates. R-a and R-h decreased nonlinearly as N addition rates increased, with a critical load of 8 g N m(-2) year(-1) above which N enrichment significantly inhibited them. R-a and R-h were controlled by different abiotic and biotic factors, and the regulation of controlling factors on soil respiration components varied over time. N-induced reduction in the relative abundance of forb significantly affected R-a, and this effect was mainly evident in the second and third years. Nitrogen enrichment significantly changed R-h in the third year, and the decreased R-h under high doses of N addition could be attributed to the changes in microbial biomass C, soil substrate quality and microbial composition. Our study highlights the leading role of R-a in regulating R-s responses to N enrichment and the enhancement of R-h/R-s ratio with increasing N addition. We also emphasize that N-induced shifts in plant community composition play a vital role in regulating R-a instead of R-h. The changing drivers of R-a and R-h with time suggests that long-term experiments with multiple levels of N addition are further needed to test the nonlinear responses and underlying mechanisms of soil respiration components in face to aggravating N deposition. A free Plain Language Summary can be found within the Supporting Information of this article.
WOS关键词CARBON-USE EFFICIENCY ; EXTRACELLULAR ENZYME-ACTIVITIES ; MICROBIAL BIOMASS ; AUTOTROPHIC RESPIRATION ; TEMPERATE GRASSLAND ; GLOBAL CHANGE ; FERTILIZATION ; RESPONSES ; DEPOSITION ; CO2
资助项目Strategic Priority Research Program of the Chinese Academy of Sciences[XDA23080302] ; National Natural Science Foundation of China[31625006] ; Ministry of Science and Technology of China[2016YFC0501803] ; Chinese Postdoctoral Science Foundation[2017M620891]
WOS研究方向Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000484020400001
出版者WILEY
资助机构Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; Ministry of Science and Technology of China ; Chinese Postdoctoral Science Foundation
源URL[http://ir.igsnrr.ac.cn/handle/311030/69615]  
专题中国科学院地理科学与资源研究所
通讯作者Niu, Shuli
作者单位1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China
2.Chinese Acad Forestry, Inst Wetland Res, Beijing Key Lab Wetland Serv & Restorat, Beijing, Peoples R China
3.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, Key Lab Grassland & Agroecosyst, Lanzhou, Gansu, Peoples R China
4.East Normal Univ, Sch Ecol & Environm Sci, Shanghai, Peoples R China
5.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Jinsong,Song, Bing,Ma, Fangfang,et al. Nitrogen addition reduces soil respiration but increases the relative contribution of heterotrophic component in an alpine meadow[J]. FUNCTIONAL ECOLOGY,2019:15.
APA Wang, Jinsong.,Song, Bing.,Ma, Fangfang.,Tian, Dashuan.,Li, Yong.,...&Niu, Shuli.(2019).Nitrogen addition reduces soil respiration but increases the relative contribution of heterotrophic component in an alpine meadow.FUNCTIONAL ECOLOGY,15.
MLA Wang, Jinsong,et al."Nitrogen addition reduces soil respiration but increases the relative contribution of heterotrophic component in an alpine meadow".FUNCTIONAL ECOLOGY (2019):15.

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来源：地理科学与资源研究所

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