KMS Institute Of Geographic Sciences And Natural Resources Research,CAS
| 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 Publication | FUNCTIONAL ECOLOGY
 |
| ISSN | 0269-8463 |
| Pages | 15 |
| Corresponding Author | Niu, Shuli(sniu@igsnrr.ac.cn) |
| Abstract | 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. |
| Keyword | nitrogen addition gradient nonlinear response plant community composition sensitivity soil respiration components soil substrate quality soil temperature |
| DOI | 10.1111/1365-2435.13433 |
| WOS Keyword | CARBON-USE EFFICIENCY ; EXTRACELLULAR ENZYME-ACTIVITIES ; MICROBIAL BIOMASS ; AUTOTROPHIC RESPIRATION ; TEMPERATE GRASSLAND ; GLOBAL CHANGE ; FERTILIZATION ; RESPONSES ; DEPOSITION ; CO2 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 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] |
| Funding Organization | 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 |
| WOS Research Area | Environmental Sciences & Ecology |
| WOS Subject | Ecology |
| WOS ID | WOS:000484020400001 |
| Publisher | WILEY |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.igsnrr.ac.cn/handle/311030/69616 |
| Collection | 中国科学院地理科学与资源研究所 |
| Corresponding Author | Niu, Shuli |
| Affiliation | 1.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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