Predominant role of soil moisture in regulating the response of ecosystem carbon fluxes to global change factors in a semi-arid grassland on the Loess Plateau

doi:10.1016/j.scitotenv.2020.139746

	Predominant role of soil moisture in regulating the response of ecosystem carbon fluxes to global change factors in a semi-arid grassland on the Loess Plateau
	Su, Fanglong 2; Wang, Fuwei 2; Li, Zhen 2; Wei, Yanan 2; Li, Shijie 2; Bai, Tongshuo 2; Wang, Yi 3; Guo, Hui 2; Hu, Shuijin 1,2
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2020-10-10
卷号	738 页码:7
关键词	Carbon fluxes Global change Plant cover Soil moisture Soil temperature
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2020.139746
通讯作者	Guo, Hui(hui.guo@njau.edu.cn) ; Hu, Shuijin(hui.guo@njau.edu.cn)
英文摘要	Climate warming, altered precipitation and nitrogen deposition may critically affect plant growth and ecosystem carbon fluxes. However, the underlying mechanisms are not fully understood. We conducted a 2-yr, multi-factor experiment (warming (W), altered precipitation (+30% and - 30%) and nitrogen addition (N)) in a semi-arid grassland on the Loess Plateau to study how these factors affect ecosystem carbon fluxes. Surprisingly, no interactive effects of warming, altered precipitation and nitrogen addition were detected on parameters of ecosystem carbon fluxes, including net ecosystem CO2 exchange (NEE), ecosystem respiration (ER), gross ecosystem productivity (GEP) and soil respiration (SR). Warming marginally reduced NEE and GEP mainly due to its negative effects on them in July and August. Altered precipitation significantly affected all parameters of carbon fluxes with precipitation reduction decreasing NEE, ER and GEP, whereas precipitation addition increasing SR. In contrast, nitrogen addition had little effect on any parameters of carbon fluxes. Soil moisture was the most important driver and positively correlated with ecosystem carbon fluxes and warming impacted ecosystem carbon fluxes indirectly by decreasing soil moisture. While plant community cover did not show significant association with carbon fluxes, semi-shrubs cover was positively related to NEE, ER and GEP. Together, these results suggest that soil water availability, rather than soil temperature and nitrogen availability, may dominate the effect of the future multi-faceted global changes on semi-arid grassland carbon fluxes on the Loess Plateau. (C) 2020 Elsevier B.V. All rights reserved.
资助项目	National Key Research and Development Program of China[2017YFC0503902] ; Key Project of NAU[0306J0887] ; National Science Foundation of China[41671269]
WOS关键词	NITROGEN ADDITION ; TERRESTRIAL ECOSYSTEMS ; INCREASED PRECIPITATION ; RESPIRATION RESPONSES ; WATER AVAILABILITY ; INORGANIC CARBON ; ELEVATED CO2 ; PLANT ; TEMPERATURE ; VARIABILITY
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000560045000016
资助机构	National Key Research and Development Program of China ; Key Project of NAU ; National Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/15174]
专题	地球环境研究所_生态环境研究室
通讯作者	Guo, Hui; Hu, Shuijin
作者单位	1.North Carolina State Univ, Dept Entomol & Plant Pathol, Raleigh, NC 27695 USA 2.Nanjing Agr Univ, Coll Resources & Environm Sci, Ecosyst Ecol Lab, Nanjing 210095, Peoples R China 3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary, Xian 710061, Peoples R China
推荐引用方式 GB/T 7714	Su, Fanglong,Wang, Fuwei,Li, Zhen,et al. Predominant role of soil moisture in regulating the response of ecosystem carbon fluxes to global change factors in a semi-arid grassland on the Loess Plateau[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020,738:7.
APA	Su, Fanglong.,Wang, Fuwei.,Li, Zhen.,Wei, Yanan.,Li, Shijie.,...&Hu, Shuijin.(2020).Predominant role of soil moisture in regulating the response of ecosystem carbon fluxes to global change factors in a semi-arid grassland on the Loess Plateau.SCIENCE OF THE TOTAL ENVIRONMENT,738,7.
MLA	Su, Fanglong,et al."Predominant role of soil moisture in regulating the response of ecosystem carbon fluxes to global change factors in a semi-arid grassland on the Loess Plateau".SCIENCE OF THE TOTAL ENVIRONMENT 738(2020):7.