Rainfall pulse response of carbon exchange to the timing of natural intra-annual rainfall in a temperate grass ecosystem
文献类型：期刊论文
| 作者 | Hao, Guangcun1,3; Hu, Zhongmin1,2 ; Di, Kai1; Li, Shenggong4,5
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| 刊名 | ECOLOGICAL INDICATORS
 |
| 出版日期 | 2020-11-01 |
| 卷号 | 118页码:7 |
| 关键词 | Climate change Rainfall pattern Grassland Ecosystem carbon balance |
| ISSN号 | 1470-160X |
| DOI | 10.1016/j.ecolind.2020.106730 |
| 通讯作者 | Hu, Zhongmin(huzm@m.scnu.edu.cn) |
| 英文摘要 | Rainfall pulses play a key role in dominating the ecosystem carbon balance in arid and semiarid regions. In the future, the intensity and frequency of rainfall events will be significantly altered. Therefore, discussing the response of the carbon balance to rainfall pulses is extremely important for predicting the effect of global change on the carbon cycle. In grasslands, previous studies have documented that there is a threshold of rainfall size, above which net ecosystem exchange (NEE) would shift from positive (carbon source) to negative (carbon sink). However, does this threshold exist under altered intra-annual rainfall timing during growing season? To answer this question, we conducted an experiment in a typical grassland ecosystem to detect the relationship between rainfall pulse and carbon balance during the growing seasons from 2012 to 2015. Our studies showed that there was no rainfall threshold for the NEE from carbon source to sink with the change in rainfall timing. In the early growing season, there was a positive relationship (carbon source) between the NEE and rainfall pulses. In the middle growing season, there was a negative relationship (carbon sink) between the NEE and rainfall pulses. Moreover, the response magnitude of the NEE was positively related to the activity duration differences between ecosystem respiration (ER) and gross primary productivity (GPP). This study provided a new perspective on the proximate causes of the effects of rainfall on NEE. The mechanism underlying the response patterns of NEE to rainfall pulses is of critical importance for improving our ability to project future changes in the Earth system. |
| WOS关键词 | GROSS PRIMARY PRODUCTIVITY ; SOIL CO2 EFFLUX ; INTERANNUAL VARIABILITY ; PRECIPITATION PULSES ; SEMIARID GRASSLAND ; INNER-MONGOLIA ; WATER ; FLUXES ; RESPIRATION ; MOISTURE |
| 资助项目 | National Natural Science Foundation of China[31922053] ; National Key R&D Program of China[2017YFA060481] ; Startup Foundation for Talented Scholars in South China Normal University[S82360] |
| WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:000578967500027 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China ; National Key R&D Program of China ; Startup Foundation for Talented Scholars in South China Normal University |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/157167]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Hu, Zhongmin |
| 作者单位 | 1.South China Normal Univ, Sch Geog, Guangzhou 510631, Peoples R China 2.Southern Marine Sci & Engn Guangdong Lab, Zhuhai 519082, Peoples R China 3.Guang Dong Res Ctr Smart Homeland Engn, Guangzhou 510631, Peoples R China 4.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Synth Res Ctr Chinese Ecosystem Res Network, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China 5.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hao, Guangcun,Hu, Zhongmin,Di, Kai,et al. Rainfall pulse response of carbon exchange to the timing of natural intra-annual rainfall in a temperate grass ecosystem[J]. ECOLOGICAL INDICATORS,2020,118:7. |
| APA | Hao, Guangcun,Hu, Zhongmin,Di, Kai,&Li, Shenggong.(2020).Rainfall pulse response of carbon exchange to the timing of natural intra-annual rainfall in a temperate grass ecosystem.ECOLOGICAL INDICATORS,118,7. |
| MLA | Hao, Guangcun,et al."Rainfall pulse response of carbon exchange to the timing of natural intra-annual rainfall in a temperate grass ecosystem".ECOLOGICAL INDICATORS 118(2020):7. |
入库方式： OAI收割
来源：地理科学与资源研究所
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