Molecular mechanisms of water table lowering and nitrogen deposition in affecting greenhouse gas emissions from a Tibetan alpine wetland

doi:10.1111/1365-2435.12854

	Molecular mechanisms of water table lowering and nitrogen deposition in affecting greenhouse gas emissions from a Tibetan alpine wetland
	Wang, Hao ; Yu, Lingfei 3; Zhang, Zhenhua ; Liu, Wei ; Chen, Litong ; Cao, Guangmin ; Yue, Haowei 4; Zhou, Jizhong 4,5,6; Yang, Yunfeng 4; Tang, Yanhong ; He, Jin-Sheng
	2017
发表期刊	GLOBAL CHANGE BIOLOGY
ISSN	1354-1013
卷号	23 期号:2 页码:815-829
摘要	Rapid climate change and intensified human activities have resulted in water table lowering (WTL) and enhanced nitrogen (N) deposition in Tibetan alpine wetlands. These changes may alter the magnitude and direction of greenhouse gas (GHG) emissions, affecting the climate impact of these fragile ecosystems. We conducted a mesocosm experiment combined with a metagenomics approach (GeoChip 5.0) to elucidate the effects of WTL (-20cm relative to control) and N deposition (30kg N ha(-1)yr(-1)) on carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) fluxes as well as the underlying mechanisms. Our results showed that WTL reduced CH4 emissions by 57.4% averaged over three growing seasons compared with no-WTL plots, but had no significant effect on net CO2 uptake or N2O flux. N deposition increased net CO2 uptake by 25.2% in comparison with no-N deposition plots and turned the mesocosms from N2O sinks to N2O sources, but had little influence on CH4 emissions. The interactions between WTL and N deposition were not detected in all GHG emissions. As a result, WTL and N deposition both reduced the global warming potential (GWP) of growing season GHG budgets on a 100-year time horizon, but via different mechanisms. WTL reduced GWP from 337.3 to -480.1g CO2-eq m(-2) mostly because of decreased CH4 emissions, while N deposition reduced GWP from 21.0 to -163.8g CO2-eq m(-2), mainly owing to increased net CO2 uptake. GeoChip analysis revealed that decreased CH4 production potential, rather than increased CH4 oxidation potential, may lead to the reduction in net CH4 emissions, and decreased nitrification potential and increased denitrification potential affected N2O fluxes under WTL conditions. Our study highlights the importance of microbial mechanisms in regulating ecosystem-scale GHG responses to environmental changes.
关键词	carbon cycle climate warming methane microbial functional gene nitrous oxide the Tibetan Plateau
学科领域	Environmental Sciences & Ecology
DOI	10.1111/1365-2435.12854
收录类别	SCI
语种	英语
WOS关键词	METHANE EMISSIONS ; NATURAL WETLANDS ; ALTITUDE PEATLAND ; NUTRIENT ADDITION ; CLIMATE-CHANGE ; CH4 EMISSIONS ; CARBON FLUXES ; N2O EMISSIONS ; SOIL ; RESPONSES
WOS记录号	WOS:000406977200015
出版者	WILEY
文献子类	Article
出版地	HOBOKEN
EISSN	1365-2486
资助机构	National Program on Key Basic Research ProjectNational Basic Research Program of China [2014CB954004] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31270481, 31321061] ; Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University
作者邮箱	jshe@pku.edu.cn
作品OA属性	Bronze
引用统计	被引频次：46[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/22237
专题	植被与环境变化国家重点实验室
作者单位	1.Peking Univ, Minist Educ, Coll Urban & Environm Sci, Dept Ecol, 5 Yiheyuan Rd, Beijing 100871, Peoples R China 2.Peking Univ, Minist Educ, Key Lab Earth Surface Proc, 5 Yiheyuan Rd, Beijing 100871, Peoples R China 3.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, 23 Xining Rd, Xining 810008, Peoples R China 4.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, 20 Nanxincun, Beijing 100093, Peoples R China 5.Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, 1 Tsinghua Garden Rd, Beijing 100084, Peoples R China 6.Univ Oklahoma, Inst Environm Genom, Dept Microbiol & Plant Biol, Norman, OK 73019 USA 7.Lawrence Berkeley Natl Lab, Div Earth Sci, Berkeley, CA 94720 USA
推荐引用方式 GB/T 7714	Wang, Hao,Yu, Lingfei,Zhang, Zhenhua,et al. Molecular mechanisms of water table lowering and nitrogen deposition in affecting greenhouse gas emissions from a Tibetan alpine wetland[J]. GLOBAL CHANGE BIOLOGY,2017,23(2):815-829.
APA	Wang, Hao.,Yu, Lingfei.,Zhang, Zhenhua.,Liu, Wei.,Chen, Litong.,...&He, Jin-Sheng.(2017).Molecular mechanisms of water table lowering and nitrogen deposition in affecting greenhouse gas emissions from a Tibetan alpine wetland.GLOBAL CHANGE BIOLOGY,23(2),815-829.
MLA	Wang, Hao,et al."Molecular mechanisms of water table lowering and nitrogen deposition in affecting greenhouse gas emissions from a Tibetan alpine wetland".GLOBAL CHANGE BIOLOGY 23.2(2017):815-829.

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