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学科主题: 生物科学::普通生物学
题名: CH4 exchanges of the natural ecosystems in China during the past three decades: The role of wetland extent and its dynamics
作者: Wei, D (Wei, Da)1, 2; Wang, XD (Wang, Xiaodan)1
通讯作者: Wang, XD
关键词: COMPARISON PROJECT WETCHIMP ; GLOBAL VEGETATION MODEL ; QINGHAI-TIBETAN PLATEAU ; IN-SITU MEASUREMENTS ; METHANE EMISSIONS ; ATMOSPHERIC METHANE ; ENVIRONMENTAL-CHANGES ; ALPINE WETLANDS ; INNER-MONGOLIA ; FUTURE CLIMATE
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
发表日期: 2016
DOI: 10.1002/2016JG003418
卷: 121, 期:9, 页:2445-2463
收录类别: SCI
合作性质: 国内
文章类型: Article
部门归属: 生态
英文摘要: CH4 is the second largest contributor to human-induced global warming. However, large uncertainties still exist regarding the magnitude and temporal variation of CH4 exchanges in China's natural ecosystems, especially under climate changes. In this study, we assessed its uncertainty and temporal variation during 1979-2012, by integrating a biogeochemical model, extensive in situ measurements, and various sources of wetland maps. Uncertainty analyses suggested that previous studies might have underestimated CH4 emissions, primarily due to bias in wetland extents in NE China. After that, 1km resolution wetland maps were used to drive the model, together with a 0.1 degrees resolution climate data set. The model showed that China's natural wetlands emitted 4.561.24TgCH(4)yr(-1) during the 1980s, which decreased to 3.861.09TgCH(4)yr(-1) in the 2000s, mainly due to wetland drainage in NE China. However, recent glacier-melt-induced wetland expansion has enhanced CH4 emissions by 28% on the Tibetan Plateau since the 1980s. The magnitude of CH4 uptake by the natural ecosystems has remained relatively stable, e.g., -2.570.18 and -2.700.19 Tg CH4 yr(-1) in the 1980s and 2000s, respectively. In summary, the net CH4 balance of China's natural ecosystems has shown a decreasing pattern, i.e., 1.99 +/- 1.42 and 1.16 +/- 1.28TgCH(4)yr(-1) in the 1980s and 2000s, respectively, despite distinct regional differences between NE China and the Tibetan Plateau. Furthermore, this study emphasizes the correct representation of wetland extent and its dynamics, i.e., wetland drainage in populated regions and wetland expansion in glacier-fed regions, in driving the decadal CH4 exchange magnitude.
语种: 英语
WOS记录号: WOS:000385712800009
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7607
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu, Peoples R China
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol & Biodivers, Beijing, Peoples R China

Recommended Citation:
Wei, D ,Wang, XD . CH4 exchanges of the natural ecosystems in China during the past three decades: The role of wetland extent and its dynamics[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2016,121(9):2445-2463.
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