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China's grazed temperate grasslands are a net source of atmospheric methane

文献类型：EI期刊论文

作者Yu Qiang; Liu Hong-Sheng
发表日期2009
关键词Atmospheric chemistry Biochemical engineering Budget control Fermentation Mammals Methane Rivers Soils Watersheds
英文摘要A budget for the methane (CH4) cycle in the Xilin River basin of Inner Mongolia is presented. The annual CH4 budget in this region depends primarily on the sum of atmospheric CH4 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 CH4 per unit area than is emitted by wetlands and ruminants. Atmospheric CH4 uptake by upland soils was -3.3 and -4.8 kg CH4 ha-1 y-1 in grazed and ungrazed areas, respectively. Average CH4 emission was 791.0 kg CH4 ha-1 y-1 from wetlands and 8.6 kg CH4 ha-1 y-1 from ruminants. The basin area-weighted average of all three processes was 6.8 kg CH4 ha-1 y-1, indicating that ruminant production has converted this basin to a net source of atmospheric CH4. The total CH4 emission from the Xilin River basin was 7.29 Gg CH4 y-1. The current grazing intensity is about eightfold higher than that which would result in a net zero CH4 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 CH4 overall. © 2009 Elsevier Ltd.
出处Atmospheric Environment
卷43期:13页:2148-2153
收录类别EI
语种英语
源URL[http://ir.igsnrr.ac.cn/handle/311030/24524]  
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 Qiang,Liu Hong-Sheng. 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

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