Nitrogen-Induced Changes in Carbon Fluxes Are Modulated by Water Availability in a Temperate Grassland

doi:10.1029/2021JG006607

	Nitrogen-Induced Changes in Carbon Fluxes Are Modulated by Water Availability in a Temperate Grassland
	Guo, Qun 1,2; Hu, Zhongmin 3,4; Li, Shenggong 1,2; Hao, Yapeng 1,2; Liang, Naishen 5; Bai, Wenming2,6 ; Zhang, Shu 7
	2021
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN	2169-8953
卷号	126 期号:12
摘要	Carbon fluxes of grasslands could be deeply affected by nitrogen (N) enrichment, however, it remains unclear how other factors modulate the N-induced changes in carbon fluxes and the underlying mechanisms. In this study, we quantified the effects of N addition on net ecosystem CO2 exchange (NEE) and its two components (gross primary productivity (GPP) and ecosystem respiration (R-e)), and how water availability modulates these effects in a temperate grassland, China. We found that N enrichment significantly increased foliar N content of grasses (related to a higher photosynthetic rate), leading to higher aboveground biomass (AGB) and therefore vegetation cover, implying higher photosynthetic leaf area. AGB was further enhanced as root: shoot ratio tended to be reduced by N-addition. Consequently, GPP was significantly stimulated by N-addition. R-e insignificantly increased with N addition. With N-induced larger increase of GPP and little change of R-e, NEE, which is negative when an ecosystem sequestrates more carbon than it releases to the atmosphere, became more negative. Due to a significant sharper versus a relatively gentler N-induced increase with increasing water availability for GPP and R-e, respectively, the N-induced reduction of NEE distinctly increased linearly with increasing water availability. The enlarged N-induced stimulation of GPP and thus NEE at ample water conditions is mainly associated with luxuriant growth of grasses who got extra increase of foliar N content, AGB, and decrease of root: shoot ratio. Our findings facilitate an advanced understanding of carbon fluxes responding to climate change and provide knowledge for management in grassland ecosystems.
关键词	carbon flux nitrogen addition water addition temperate grassland climate change
学科领域	Environmental Sciences ; Geosciences, Multidisciplinary
DOI	10.1029/2021JG006607
收录类别	SCI
语种	英语
WOS关键词	INCREASED PRECIPITATION ; SOIL RESPIRATION ; INTERANNUAL VARIABILITY ; ECOSYSTEM RESPIRATION ; PRIMARY PRODUCTIVITY ; USE EFFICIENCY ; RESPONSES ; EXCHANGE ; PLANT ; DEPOSITION
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000734472100005
出版者	AMER GEOPHYSICAL UNION
文献子类	Article
出版地	WASHINGTON
EISSN	2169-8961
资助机构	National Natural Science Foundation of China [31922053, 32171555, 31961143022] ; National Key R&D Program of China [2017YFA0604801] ; Strategic Priority Research Program of Chinese Academy of Sciences [Pan-TPE XDA2003020202, XDA23060205]
作者邮箱	huzm@m.scnu.edu.cn ; lisg@igsnrr.ac.cn
引用统计	被引频次：9[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/2S10CLM1/26777
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, Peoples R China 2.Natl Ecosyst Sci Data Ctr, Beijing, Peoples R China 3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China 4.Hainan Univ, Coll Ecol & Environm, Haikou, Hainan, Peoples R China 5.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai, Guangdong, Peoples R China 6.Natl Inst Environm Studies, Earth Syst Div, Global Carbon Cycle Res Sect, Tsukuba, Ibaraki, Japan 7.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 8.Heilongjiang Prov Meteorol Serv Ctr, Harbin, Peoples R China
推荐引用方式 GB/T 7714	Guo, Qun,Hu, Zhongmin,Li, Shenggong,et al. Nitrogen-Induced Changes in Carbon Fluxes Are Modulated by Water Availability in a Temperate Grassland[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2021,126(12).
APA	Guo, Qun.,Hu, Zhongmin.,Li, Shenggong.,Hao, Yapeng.,Liang, Naishen.,...&Zhang, Shu.(2021).Nitrogen-Induced Changes in Carbon Fluxes Are Modulated by Water Availability in a Temperate Grassland.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,126(12).
MLA	Guo, Qun,et al."Nitrogen-Induced Changes in Carbon Fluxes Are Modulated by Water Availability in a Temperate Grassland".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 126.12(2021).

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