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CH4 exchanges of the natural ecosystems in China during the past three decades: The role of wetland extent and its dynamics
Alternative TitleCH4 exchanges of the natural ecosystems in China during the past three decades: The role of wetland extent and its dynamics
Wei, Da1,2; Wang, Xiaodan1
Corresponding AuthorWang XD
2016
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN2169-8953
EISSN2169-8961
Volume121Issue:9Pages:2445-2463
SubtypeArticle
AbstractCH4 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.
KeywordMethane (Ch4) Natural Ecosystems Aerated Soil Wetland China Climate Change
Subject Area地球科学
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
DOI10.1002/2016JG003418
WOS Subject ExtendedEnvironmental Sciences & Ecology ; Geology
Indexed BySCI
WOS KeywordCOMPARISON PROJECT WETCHIMP ; GLOBAL VEGETATION MODEL ; QINGHAI-TIBETAN PLATEAU ; IN-SITU MEASUREMENTS ; METHANE EMISSIONS ; ATMOSPHERIC METHANE ; ENVIRONMENTAL-CHANGES ; ALPINE WETLANDS ; INNER-MONGOLIA ; FUTURE CLIMATE
Language英语
WOS SubjectEnvironmental Sciences ; Geosciences, Multidisciplinary
WOS IDWOS:000385712800009
Funding OrganizationYoung Innovation Foundation of Institute of Mountain Hazards and Environments, Chinese Academy of Sciences(Y6K2070070) ; National Natural Scientific Foundation of China(41305122) ; China Postdoctoral Science Foundation(2014 M550851 ; 2015 T80140)
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Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/17689
Collection山地表生过程与生态调控重点实验室
Affiliation1.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
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
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]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2016,121(9):2445-2463.
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),2445-2463.
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):2445-2463.
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