Water causes divergent responses of specific carbon sink to long-term grazing in a desert grassland
文献类型：期刊论文
| 作者 | Jin, Yuxi; Tian, Dashuan3; Li, Jiangwen4; Wu, Qian; Pan, Zhanlei5; Han, Mengqi; Wang, Yuehua; Zhang, Jun1; Han, Guodong |
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2023-05-15 |
| 卷号 | 873页码:162166 |
| ISSN号 | 0048-9697 |
| 关键词 | Desert steppe Grazing intensity Precipitation Specific carbon sink Plant community composition Leaf traits |
| DOI | 10.1016/j.scitotenv.2023.162166 |
| 文献子类 | Article |
| 英文摘要 | Heavy grazing generally reduces grassland biomass, further decreasing its carbon sink. Grassland carbon sink is determined by both plant biomass and carbon sink per unit biomass (specific carbon sink). This specific carbon sink could reflect grassland adaptative response, because plants generally tend to adaptively enhance the functioning of their remaining biomass after grazing (i.e. higher leaf nitrogen content). Though we know well about the regulation of grassland biomass on carbon sink, little attention is paid to the role of specific carbon sink. Thus, we conducted a 14-year grazing experiment in a desert grassland. Ecosystem carbon fluxes, including net ecosystem CO2 exchange (NEE), gross ecosystem productivity (GEP) and ecosystem respiration (ER), were measured frequently during five consecutive growing seasons with contrasting precipitation events. We found that heavy grazing reduced NEE more in drier (-94.0 %) than wetter (-33.9 %) years. However, grazing did not reduce community biomass much more in drier (-70.4 %) than wetter years (-66.0 %). These meant a positive response of specific NEE (NEE per unit biomass) to grazing in wetter years. This positive response of specific NEE was mainly caused by a higher biomass ratio of other species versus perennial grasses with greater leaf nitrogen content and specific leaf area in wetter years. In addition, we also detected a shift of grazing effects on specific NEE from positive in wetter years to negative in drier years. Overall, this study is among the first to reveal the adaptive response of grassland specific carbon sink to experimental grazing in plant trait view. The stimulation response of specific carbon sink can partially compensate for the loss of grassland carbon storage under grazing. These new findings highlight the role of grassland adaptive response in decelerating climate warming. |
| 学科主题 | Environmental Sciences & Ecology |
| WOS关键词 | PLANT FUNCTIONAL TRAITS ; DIOXIDE EXCHANGE ; INNER-MONGOLIA ; LEAF TRAITS ; ECOSYSTEM ; FLUXES ; STEPPE ; CO2 ; VARIABILITY ; INTENSITY |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/193525]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_外文论文 |
| 作者单位 | 1.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China 2.Inner Mongolia Agr Univ, Coll Sci, Hohhot 010011, Peoples R China 3.Inner Mongolia Agr Univ, Coll Grassland Resources & Environm, Key Lab Grassland Resources, Key Lab Forage Cultivat Proc & High Efficient Uti, Hohhot 010011, Peoples R China 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 5.Yan Univ, Coll Life Sci, Yanan 716000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Jin, Yuxi,Tian, Dashuan,Li, Jiangwen,et al. Water causes divergent responses of specific carbon sink to long-term grazing in a desert grassland[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2023,873:162166. |
| APA | Jin, Yuxi.,Tian, Dashuan.,Li, Jiangwen.,Wu, Qian.,Pan, Zhanlei.,...&Han, Guodong.(2023).Water causes divergent responses of specific carbon sink to long-term grazing in a desert grassland.SCIENCE OF THE TOTAL ENVIRONMENT,873,162166. |
| MLA | Jin, Yuxi,et al."Water causes divergent responses of specific carbon sink to long-term grazing in a desert grassland".SCIENCE OF THE TOTAL ENVIRONMENT 873(2023):162166. |
入库方式： OAI收割
来源：地理科学与资源研究所
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