Increasing grassland degradation stimulates the non-growing season CO2 emissions from an alpine meadow on the Qinghai-Tibetan Plateau
文献类型：期刊论文
| 作者 | Lei Ma1,2; Zhisheng Yao1; Xunhua Zheng1,2; Han Zhang1,3; Kai Wang1; Bo Zhu4; Rui Wang1; Wei Zhang1; Chunyan Liu1; Zhu, Bo
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| 刊名 | ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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| 出版日期 | 2018 |
| 卷号 | 25期号:26页码:26576-26591 |
| 关键词 | Aboveground net primary productivity Alpine meadow Carbon dioxide Grassland degradation Non-growing season Plateau zokor Qinghai-Tibetan Plateau |
| ISSN号 | 0944-1344 |
| DOI | 10.1007/s11356-018-2724-5 |
| 产权排序 | 4 |
| 通讯作者 | Zhisheng Yao |
| 英文摘要 | The alpine meadow ecosystem is one of the major vegetation biomes on the Qinghai-Tibetan Plateau, which hold substantial quantities of soil organic carbon. Pronounced grassland degradations (induced by overgrazing/climate change and further exacerbated by the subterranean rodent activities) that have widely occurred in this ecosystem may significantly alter the non-growing season carbon turnover processes such as carbon dioxide (CO2) efflux, but little is known about how the non-growing season CO2 emissions respond to the degradation (particularly the exacerbated degradations by plateau zokor), as most previous studies have focused primarily on the growing season. In this study, the effects of four degradation levels (i.e., the healthy meadow (HM), degraded patches (DP), 2-year-old zokor mounds (ZM2), and current-year zokor mounds (ZM1)) on CO2 emissions and corresponding environmental and agronomic variables were investigated over the two non-growing seasons under contrasting climatic conditions (a normal season in 2013-2014 and a warm and humid season in 2014-2015). The temporal variation in the non-growing season CO2 emissions was mainly regulated by soil temperature, while increasing degradation levels reduced the temperature sensitivity of CO2 emissions due to a reduction in soil water content. The cumulative CO2 emissions across the non-growing season were 587-1283kg Cha(-1) for all degradation levels, which varied significantly (p<0.05) interannually. The degradation of alpine meadows significantly (p<0.05) reduced the vegetation cover and aboveground net primary productivity as well as the belowground biomass, which are typically thought to decrease soil CO2 emissions. However, the non-growing season CO2 emissions for the degraded meadow, weighted by the areal extent of the DP, ZM2, and ZM1, were estimated to be 641-1280kg Cha(-1), which was significantly higher (p<0.05) as compared with the HM in the warm and humid season of 2014-2015 but not in the normal season of 2013-2014. Additionally, grassland degradation substantially increased the productivity-scaled non-growing season CO2 emissions, which showed an exponential trend with increasing degradation levels. These results suggest that there is a strong connection between grassland degradation and soil carbon loss, e.g., in the form of CO2 release, pointing to the urgent need to manage degraded grassland restoration that contributes to climate change mitigation. |
| 电子版国际标准刊号 | 1614-7499 |
| 语种 | 英语 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/23881]  |
| 专题 | 成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室 |
| 作者单位 | 1.State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, People’s Republic of China; 2.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China; 3.Nanjing University of Information Science and Technology, Nanjing 210044, People’s Republic of China; 4.Key Laboratory of Mountain Environment Evolvement and Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Lei Ma,Zhisheng Yao,Xunhua Zheng,et al. Increasing grassland degradation stimulates the non-growing season CO2 emissions from an alpine meadow on the Qinghai-Tibetan Plateau[J]. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,2018,25(26):26576-26591. |
| APA | Lei Ma.,Zhisheng Yao.,Xunhua Zheng.,Han Zhang.,Kai Wang.,...&Zhang, Wei.(2018).Increasing grassland degradation stimulates the non-growing season CO2 emissions from an alpine meadow on the Qinghai-Tibetan Plateau.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,25(26),26576-26591. |
| MLA | Lei Ma,et al."Increasing grassland degradation stimulates the non-growing season CO2 emissions from an alpine meadow on the Qinghai-Tibetan Plateau".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 25.26(2018):26576-26591. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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