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

文献类型：期刊论文

作者Guo, Qun2,3; Hu, Zhongmin5,7; Li, Shenggong2,3; Hao, Yapeng2,3; Liang, Naishen6; Bai, Wenming1,2; Zhang, Shu4
刊名JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
出版日期2021
卷号126期号:12
关键词carbon flux nitrogen addition water addition temperate grassland climate change
ISSN号2169-8953
DOI10.1029/2021JG006607
文献子类Article
英文摘要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.
学科主题Environmental Sciences ; Geosciences, Multidisciplinary
出版地WASHINGTON
电子版国际标准刊号2169-8961
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)
语种英语
WOS记录号WOS:000734472100005
出版者AMER GEOPHYSICAL UNION
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]
源URL[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.Natl Inst Environm Studies, Earth Syst Div, Global Carbon Cycle Res Sect, Tsukuba, Ibaraki, Japan
2.Natl Ecosyst Sci Data Ctr, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China
4.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China
5.Hainan Univ, Coll Ecol & Environm, Haikou, Hainan, Peoples R China
6.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai, Guangdong, Peoples R China
7.Univ Chinese Acad Sci, Coll Resources & Environm, 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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来源：植物研究所

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