Nonlinear responses of ecosystem carbon fluxes and water-use efficiency to nitrogen addition in Inner Mongolia grassland

doi:10.1111/1365-2435.12513

CORC > 植物研究所 > 中国科学院植物研究所 > 植被与环境变化国家重点实验室

	Nonlinear responses of ecosystem carbon fluxes and water-use efficiency to nitrogen addition in Inner Mongolia grassland
	Tian, Dashuan 3; Niu, Shuli 3; Pan, Qingmin ; Ren, Tingting ; Chen, Shiping ; Bai, Yongfei ; Han, Xingguo 1
刊名	FUNCTIONAL ECOLOGY
	2016
卷号	30 期号:3
关键词	ecosystem carbon balance nitrogen deposition precipitation pattern saturation response threshold response water flux
ISSN号	0269-8463
DOI	10.1111/1365-2435.12513
文献子类	Article
英文摘要	1. Nitrogen (N) deposition is a continuous process and likely to affect ecosystem carbon (C) and water fluxes in a nonlinear way. However, experimental evidence is still lacking because most previous studies on these impacts usually used two discrete levels of N treatment. 2. By a 12-year, 6-level N addition experiment in Inner Mongolia grassland, we found that the responses of C fluxes, including net ecosystem carbon exchange (NEE), gross ecosystem productivity (GEP), ecosystem respiration (ER), all exhibited nonlinear patterns with increasing N addition rate while that of evapotranspiration did not significantly change. As a result, the response of ecosystem water-use efficiency (EWUE) followed a similar pattern with NEE. 3. These N-induced changes in C fluxes were greatly affected by the distribution of precipitation among different stages of growing seasons and mainly driven by the alterations in biomass production rather than soil temperature and soil moisture. 4. This study highlights the importance of the nonlinearity of N addition impacts on ecosystem C fluxes, which should be incorporated into the global-C-cycling models for better predicting future C balance. Our results also have implications for the use of fertilization in restoring the degraded grasslands given that N addition can promote biomass production and ecosystem C uptake without additional water evapotranspiration but also change ecosystem composition.
学科主题	Ecology
电子版国际标准刊号	1365-2435
出版地	HOBOKEN
WOS关键词	SEMIARID GRASSLAND ; FOREST ECOSYSTEMS ; EXCHANGE ; VEGETATION ; CO2 ; SEQUESTRATION ; EXPOSURE ; PULSES
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
语种	英语
出版者	WILEY
WOS记录号	WOS:000372949000016
资助机构	Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [30970496, 31430016] ; Knowledge Innovation Program of the Chinese Academy of SciencesChinese Academy of SciencesKnowledge Innovation Program of the Chinese Academy of Sciences [KSCX2-EW-Z-5]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/24551]
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Inst Appl Ecol, State Key Lab Forest & Soil Ecol, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
推荐引用方式 GB/T 7714	Tian, Dashuan,Niu, Shuli,Pan, Qingmin,et al. Nonlinear responses of ecosystem carbon fluxes and water-use efficiency to nitrogen addition in Inner Mongolia grassland[J]. FUNCTIONAL ECOLOGY,2016,30(3).
APA	Tian, Dashuan.,Niu, Shuli.,Pan, Qingmin.,Ren, Tingting.,Chen, Shiping.,...&Han, Xingguo.(2016).Nonlinear responses of ecosystem carbon fluxes and water-use efficiency to nitrogen addition in Inner Mongolia grassland.FUNCTIONAL ECOLOGY,30(3).
MLA	Tian, Dashuan,et al."Nonlinear responses of ecosystem carbon fluxes and water-use efficiency to nitrogen addition in Inner Mongolia grassland".FUNCTIONAL ECOLOGY 30.3(2016).