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Molecular mechanisms of water table lowering and nitrogen deposition in affecting greenhouse gas emissions from a Tibetan alpine wetland
Wang, Hao1,2,3; Yu, Lingfei4; Zhang, Zhenhua3; Liu, Wei3; Chen, Litong3; Cao, Guangmin3; Yue, Haowei5; Zhou, Jizhong5,6,7; Yang, Yunfeng5; Tang, Yanhong1,2; He, Jin-Sheng1,2,3
2017-02-01
Source PublicationGLOBAL CHANGE BIOLOGY
Volume23Issue:2Pages:815-829
SubtypeArticle
AbstractRapid 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.
KeywordCarbon Cycle Climate Warming Methane Microbial Functional Gene Nitrous Oxide The Tibetan Plateau
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
DOI10.1111/gcb.13467
WOS KeywordMETHANE EMISSIONS ; NATURAL WETLANDS ; ALTITUDE PEATLAND ; NUTRIENT ADDITION ; OMBROTROPHIC BOG ; NORTHEAST CHINA ; CLIMATE-CHANGE ; CH4 EMISSIONS ; CARBON FLUXES ; N2O EMISSIONS
Indexed BySCI
Language英语
Funding OrganizationNational Program on Key Basic Research Project(2014CB954004) ; National Natural Science Foundation of China(31270481 ; Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University ; 31321061)
WOS Research AreaBiodiversity & Conservation ; Environmental Sciences & Ecology
WOS SubjectBiodiversity Conservation ; Ecology ; Environmental Sciences
WOS IDWOS:000394343300031
Citation statistics
Document Type期刊论文
Identifierhttp://210.75.249.4/handle/363003/6829
Collection中国科学院西北高原生物研究所
Affiliation1.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
Recommended Citation
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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