China's grazed temperate grasslands are a net source of atmospheric methane
文献类型：SCI/SSCI论文
| 作者 | Yu Q. |
| 发表日期 | 2009 |
| 关键词 | CH(4) flux Enteric fermentation Wetlands CH(4) budget Xilin River basin Inner Mongolia inner-mongolia nitrous-oxide carbon-dioxide fluxes emission steppe ch4 livestock plants sheep |
| 英文摘要 | A budget for the methane (CH(4)) cycle in the Xilin River basin of Inner Mongolia is presented. The annual CH(4) budget in this region depends primarily on the sum of atmospheric CH(4) uptake by upland soils, emission from small wetlands, and emission from grazing ruminants (sheep, goats, and cattle). Flux rates for these processes were averaged over multiple years with differing summer rainfall. Although uplands constitute the vast majority of land area, they consume much less CH(4) per unit area than is emitted by wetlands and ruminants. Atmospheric CH(4) uptake by upland soils was -3.3 and -4.8 kg CH(4) ha(-1) y(-1) in grazed and ungrazed areas, respectively. Average CH(4) emission was 791.0 kg CH(4) ha(-1) y(-1) from wetlands and 8.6 kg CH(4) ha(-1) y(-1) from ruminants. The basin area-weighted average of all three processes was 6.8 kg CH(4) ha(-1) y(-1), indicating that ruminant production has converted this basin to a net source of atmospheric CH(4). The total CH(4) emission from the Xilin River basin was 7.29 Gg CH(4) y(-1). The current grazing intensity is about eightfold higher than that which would result in a net zero CH(4) flux, Since grazing intensity has increased throughout western China, it is likely that ruminant production has converted China's grazed temperate grasslands to a net source of atmospheric CH(4) overall. (C) 2009 Elsevier Ltd. All rights reserved. |
| 出处 | Atmospheric Environment |
| 卷 | 43 |
| 期 | 13 |
| 页 | 2148-2153 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1352-2310 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/22822]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Yu Q.. China's grazed temperate grasslands are a net source of atmospheric methane. 2009. |
入库方式： OAI收割
来源：地理科学与资源研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。