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Nitrogen-Induced Changes in Carbon Fluxes Are Modulated by Water Availability in a Temperate Grassland
Guo, Qun1,2; Hu, Zhongmin3,4; Li, Shenggong1,2; Hao, Yapeng1,2; Liang, Naishen5; Bai, Wenming2,6; Zhang, Shu7
2021
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN2169-8953
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
DOI10.1029/2021JG006607
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
EISSN2169-8961
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:4[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
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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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