Nonlinear response of soil respiration to increasing nitrogen additions in a Tibetan alpine steppe
文献类型：期刊论文
| 作者 | Peng, Yunfeng1; Li, Fei1,2; Zhou, Guoying3,4; Fang, Kai1; Zhang, Dianye1; Li, Changbin2,3,4; Yang, Guibiao1; Wang, Guanqin1; Wang, Jun1; Mohammat, Anwar5 |
| 刊名 | environmental research letters
 |
| 出版日期 | 2017-02-01 |
| 卷号 | 12期号:2 |
| 关键词 | autotrophic respiration carbon (C) cycling heterotrophic respiration nitrogen (N) input structural equation modeling (SEM) |
| 英文摘要 | nitrogen (n) availability is a key regulator of carbon (c) cycling in terrestrial ecosystems. anthropogenic n input, such as n deposition and fertilization, increases n availability in soil, which has important implications for an ecosystem's c storage and loss. soil respiration (rs), which is the second largest c flux from terrestrial ecosystems to the atmosphere, plays an important role in terrestrial c cycles. the direction and magnitude of the responses of rs and its components to n addition have been widely evaluated, but it remains unclear how these processes change across multiple n addition levels. here we conducted a two-year field experiment to examine the changes of rs and its autotrophic respiration (ra) and heterotrophic respiration (rh) components along a gradient of eight n levels (0, 1 2, 4, 8, 16, 24, 32 g m(-2) yr(-1)) in a tibetan alpine steppe, and used structural equation modeling (sem) to explore the relative contributions of biotic and abiotic variables and their direct and indirect pathways regulating the ra and rh. our results indicated that both rs and ra exhibited first increasing and then subsequent decreasing trends at the threshold of 8 g n m(-2) yr(-1). in contrast, the rh declined linearly with the n addition rate continuously increasing. sem analysis revealed that, among various environmental factors, soil temperature was the most important one modulating rs, which not only had a direct effect on the two rs components, but also indirectly regulated the ra and rh via root and microbial biomass. these findings suggest that the nonlinear response patterns of rs should be considered for better predicting terrestrial c balance, given that anthropogenic n input to the terrestrial ecosystems is increasing continuously. |
| WOS标题词 | science & technology ; life sciences & biomedicine ; physical sciences |
| 类目[WOS] | environmental sciences ; meteorology & atmospheric sciences |
| 研究领域[WOS] | environmental sciences & ecology ; meteorology & atmospheric sciences |
| 关键词[WOS] | ecosystem carbon exchange ; temperate steppe ; forest ecosystems ; microbial biomass ; co2 efflux ; nutrient availability ; root production ; climate-change ; deposition ; enrichment |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000395741500002 |
| 源URL | [http://ir.nwipb.ac.cn/handle/363003/6801]  |
| 专题 | 西北高原生物研究所_中国科学院西北高原生物研究所 |
| 作者单位 | 1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810008, Peoples R China 4.Chinese Acad Sci, Key Lab Tibetan Med Res, Xining 810008, Peoples R China 5.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China |
| 推荐引用方式 GB/T 7714 | Peng, Yunfeng,Li, Fei,Zhou, Guoying,et al. Nonlinear response of soil respiration to increasing nitrogen additions in a Tibetan alpine steppe[J]. environmental research letters,2017,12(2). |
| APA | Peng, Yunfeng.,Li, Fei.,Zhou, Guoying.,Fang, Kai.,Zhang, Dianye.,...&Yang, Yuanhe.(2017).Nonlinear response of soil respiration to increasing nitrogen additions in a Tibetan alpine steppe.environmental research letters,12(2). |
| MLA | Peng, Yunfeng,et al."Nonlinear response of soil respiration to increasing nitrogen additions in a Tibetan alpine steppe".environmental research letters 12.2(2017). |
入库方式： OAI收割
来源：西北高原生物研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。