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

文献类型：期刊论文

作者Hasi, Muqier1,3; Zhang, Xueyao3; Niu, Guoxiang1,3; Wang, Yinliu1,3; Geng, Qianqian1,3; Quan, Quan2; Chen, Shiping1,3; Han, Xingguo1,3; Huang, Jianhui1,3
刊名AGRICULTURAL AND FOREST METEOROLOGY
出版日期2021-07-15
卷号304页码:10
关键词Net ecosystem productivity Ecosystem respiration Gross ecosystem productivity Meadow steppe Nitrogen addition Soil water content
ISSN号0168-1923
DOI10.1016/j.agrformet.2021.108389
通讯作者Han, Xingguo(xghan@ibcas.ac.cn) ; Huang, Jianhui(jhhuang@ibcas.ac.cn)
英文摘要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.
WOS关键词SPECIES RICHNESS ; N DEPOSITION ; RESPONSES ; WATER ; LIMITATION ; FLUXES ; EUTROPHICATION ; PHOTOSYNTHESIS ; BIODIVERSITY ; DEPENDENCE
资助项目National Natural Science Foundation of China[31430016] ; National Natural Science Foundation of China[31670483]
WOS研究方向Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
语种英语
WOS记录号WOS:000652014300023
出版者ELSEVIER
资助机构National Natural Science Foundation of China
源URL[http://ir.igsnrr.ac.cn/handle/311030/163951]  
专题中国科学院地理科学与资源研究所
通讯作者Han, Xingguo; Huang, Jianhui
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, 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		 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,2021,304:10.
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,304,10.
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):10.

入库方式： OAI收割

来源：地理科学与资源研究所

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