气候变化领域集成服务门户(CCPortal): CH4 exchanges of the natural ecosystems in China during the past three decades: The role of wetland extent and its dynamics

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DOI	10.1002/2016JG003418
	CH4 exchanges of the natural ecosystems in China during the past three decades: The role of wetland extent and its dynamics
	Wei, Da; Wang, Xiaodan
通讯作者	Wang, XD (通讯作者)
发表日期	2016
ISSN	2169-8953
EISSN	2169-8961
起始页码	2445
结束页码	2463
卷号	121 期号:9
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.
关键词	QINGHAI-TIBETAN PLATEAU NORTHERN HIGH-LATITUDES IN-SITU MEASUREMENTS METHANE EMISSIONS ATMOSPHERIC METHANE ENVIRONMENTAL-FACTORS ALPINE WETLANDS CARBON-DIOXIDE PRESENT STATE SOIL
英文关键词	methane (CH4); natural ecosystems; aerated soil; wetland; China; climate change
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS记录号	WOS:000385712800009
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258633
推荐引用方式 GB/T 7714	Wei, Da,Wang, Xiaodan. CH4 exchanges of the natural ecosystems in China during the past three decades: The role of wetland extent and its dynamics[J]. 中国科学院青藏高原研究所,2016,121(9).
APA	Wei, Da,&Wang, Xiaodan.(2016).CH4 exchanges of the natural ecosystems in China during the past three decades: The role of wetland extent and its dynamics.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,121(9).
MLA	Wei, Da,et al."CH4 exchanges of the natural ecosystems in China during the past three decades: The role of wetland extent and its dynamics".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 121.9(2016).