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题名: Linkages of plant stoichiometry to ecosystem production and carbon fluxes with increasing nitrogen inputs in an alpine steppe
作者: Peng, Yunfeng1; Li, Fei1, 2; Zhou, Guoying3, 4; Fang, Kai1, 2; Zhang, Dianye1, 2; Li, Changbin2, 3, 4; Yang, Guibiao1, 2; Wang, Guanqin1, 2; Wang, Jun1, 2; Yang, Yuanhe1, 2
刊名: GLOBAL CHANGE BIOLOGY
出版日期: 2017-12-01
卷号: 23, 期号:12, 页码:5249-5259
关键词: carbon (C) cycle ; ecosystem respiration ; gross ecosystem productivity ; net ecosystem carbon exchange ; nitrogen addition ; nitrogen:phosphorous (N:P) ratio ; N-P imbalance
DOI: 10.1111/gcb.13789
文章类型: Article
英文摘要: Unprecedented levels of nitrogen (N) have entered terrestrial ecosystems over the past century, which substantially influences the carbon (C) exchange between the atmosphere and biosphere. Temperature and moisture are generally regarded as themajor controllers over the N effects on ecosystem C uptake and release. N-phosphorous (P) stoichiometry regulates the growth and metabolisms of plants and soil organisms, thereby affecting many ecosystem C processes. However, it remains unclear how the N-induced shift in the plant N:P ratio affects ecosystem production and C fluxes and its relative importance. We conducted a field manipulative experiment with eight N addition levels in a Tibetan alpine steppe and assessed the influences of N on aboveground net primary production (ANPP), gross ecosystem productivity (GEP), ecosystem respiration (ER), and net ecosystem exchange (NEE); we used linear mixed-effects models to further determine the relative contributions of various factors to the N-induced changes in these parameters. Our results showed that the ANPP, GEP, ER, and NEE all exhibited nonlinear responses to increasing N additions. Further analysis demonstrated that the plant N:P ratio played a dominate role in shaping these C exchange processes. There was a positive relationship between the N-induced changes in ANPP (Delta ANPP) and the plant N:P ratio (Delta N:P), whereas the GEP, ER, and NEE exhibited quadratic correlations with the Delta N:P. In contrast, soil temperature and moisture were only secondary predictors for the changes in ecosystem production and C fluxes along the N addition gradient. These findings highlight the importance of plant N:P ratio in regulating ecosystem C exchange, which is crucial for improving our understanding of C cycles under the scenarios of global N enrichment.
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Biodiversity Conservation ; Ecology ; Environmental Sciences
研究领域[WOS]: Biodiversity & Conservation ; Environmental Sciences & Ecology
关键词[WOS]: TERRESTRIAL ECOSYSTEMS ; TEMPERATE STEPPE ; TIBETAN PLATEAU ; SOIL RESPIRATION ; GLOBAL CHANGES ; CO2 EFFLUX ; RESPONSES ; GRASSLAND ; PHOSPHORUS ; DEPOSITION
收录类别: SCI
项目资助者: National Natural Science Foundation of China(31400417 ; 31670482)
语种: 英语
WOS记录号: WOS:000414969000025
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内容类型: 期刊论文
URI标识: http://210.75.249.4/handle/363003/10363
Appears in Collections:中国科学院西北高原生物研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Northwest Inst Plateau Biol, Xining, Qinghai, Peoples R China
4.Chinese Acad Sci, Key Lab Tibetan Med Res, Xining, Qinghai, Peoples R China
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