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Nitrogen addition reduces soil respiration but increases the relative contribution of heterotrophic component in an alpine meadow
Wang, Jinsong1; Song, Bing1,2; Ma, Fangfang1,2; Tian, Dashuan1; Li, Yong3; Yan, Tao4; Quan, Quan1,2; Zhang, Fangyue1,2; Li, Zhaolei1; Wang, Bingxue1; Gao, Qiang5; Chen, Weinan1,2; Niu, Shuli1,2
2019-08-28
Source PublicationFUNCTIONAL ECOLOGY
ISSN0269-8463
Pages15
Corresponding AuthorNiu, Shuli(sniu@igsnrr.ac.cn)
AbstractDisentangling 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.
Keywordnitrogen addition gradient nonlinear response plant community composition sensitivity soil respiration components soil substrate quality soil temperature
DOI10.1111/1365-2435.13433
WOS KeywordCARBON-USE EFFICIENCY ; EXTRACELLULAR ENZYME-ACTIVITIES ; MICROBIAL BIOMASS ; AUTOTROPHIC RESPIRATION ; TEMPERATE GRASSLAND ; GLOBAL CHANGE ; FERTILIZATION ; RESPONSES ; DEPOSITION ; CO2
Indexed BySCI
Language英语
Funding ProjectStrategic 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]
Funding OrganizationStrategic 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
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEcology
WOS IDWOS:000484020400001
PublisherWILEY
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/69616
Collection中国科学院地理科学与资源研究所
Corresponding AuthorNiu, Shuli
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Chinese Acad Forestry, Inst Wetland Res, Beijing Key Lab Wetland Serv & Restorat, Beijing, Peoples R China
4.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, Key Lab Grassland & Agroecosyst, Lanzhou, Gansu, Peoples R China
5.East Normal Univ, Sch Ecol & Environm Sci, Shanghai, Peoples R China
Recommended Citation
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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