Soil moisture, temperature and nitrogen availability interactively regulate carbon exchange in a meadow steppe ecosystem

doi:10.1016/j.agrformet.2021.108389

	Soil moisture, temperature and nitrogen availability interactively regulate carbon exchange in a meadow steppe ecosystem
	Hasi, Muqier 1; Zhang, Xueyao ; Niu, Guoxiang 1; Wang, Yinliu 1; Geng, Qianqian 1; Quan, Quan 2; Chen, Shiping1 ; Han, Xingguo1 ; Huang, Jianhui1
	2021
发表期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
卷号	304
摘要	Primary productivity in terrestrial ecosystems can be significantly altered by the predicted increases in nitrogen (N) deposition, but it is still unclear how N deposition influences the carbon (C) exchange processes especially in dryland ecosystems. In this study, a 3-year experiment with two types of fertilizers and five N addition levels was conducted in a semiarid steppe of Erguna, Inner Mongolia to assess the effects of exogenous N input on net ecosystem productivity (NEP), gross ecosystem productivity (GEP) and ecosystem respiration (ER). Our results showed that enhanced N input significantly increased NEP and GEP when the volumetric soil water content (VWC) was greater than 15% (v/v%), but had trivial and inconsistent effects when VWC was less than that threshold. Moreover, the NEP and GEP increased significantly with increasing N addition but leveled off when the N input reached 10 g N m(-2) year(-1) and the VWC was above 15%. However, the ER showed a significant increase with N addition rates, regardless of soil water content. Our main findings are as follows. First, the ecosystem C exchange can be significantly enhanced by addition of N only when soil moisture exceeds certain threshold, suggesting co-limitation of water and N in the grassland ecosystem that we studied. Second, in addition to concurrent consideration of water, temperature and N as well as their interactions also need to be accounted for. Third, the frequency of days with the VWC being higher than 15% accounted only around one third of days during the three growing seasons. Taken together, our findings imply that the expected increases of carbon sequestration should be minimal under N deposition in the Inner Mongolia grassland ecosystems.
关键词	Net ecosystem productivity Ecosystem respiration Gross ecosystem productivity Meadow steppe Nitrogen addition Soil water content
学科领域	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
DOI	10.1016/j.agrformet.2021.108389
收录类别	SCI
语种	英语
WOS关键词	SPECIES RICHNESS ; N DEPOSITION ; RESPONSES ; WATER ; LIMITATION ; FLUXES ; EUTROPHICATION ; PHOTOSYNTHESIS ; BIODIVERSITY ; DEPENDENCE
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000652014300023
出版者	ELSEVIER
文献子类	Article
出版地	AMSTERDAM
EISSN	1873-2240
资助机构	National Natural Science Foundation of China [31430016, 31670483]
作者邮箱	xghan@ibcas.ac.cn ; jhhuang@ibcas.ac.cn
引用统计	被引频次：17[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/26596
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 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, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Hasi, Muqier,Zhang, Xueyao,Niu, Guoxiang,et al. Soil moisture, temperature and nitrogen availability interactively regulate carbon exchange in a meadow steppe ecosystem[J]. AGRICULTURAL AND FOREST METEOROLOGY,2021,304.
APA	Hasi, Muqier.,Zhang, Xueyao.,Niu, Guoxiang.,Wang, Yinliu.,Geng, Qianqian.,...&Huang, Jianhui.(2021).Soil moisture, temperature and nitrogen availability interactively regulate carbon exchange in a meadow steppe ecosystem.AGRICULTURAL AND FOREST METEOROLOGY,304.
MLA	Hasi, Muqier,et al."Soil moisture, temperature and nitrogen availability interactively regulate carbon exchange in a meadow steppe ecosystem".AGRICULTURAL AND FOREST METEOROLOGY 304(2021).

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