YIC-IR  > 中科院海岸带环境过程与生态修复重点实验室
Agricultural reclamation effects on ecosystem CO2 exchange of a coastal wetland in the Yellow River Delta
Han, Guangxuan1; Xing, Qinghui1; Yu, Junbao1; Luo, Yiqi2; Li, Dejun2; Yang, Liqiong1; Wang, Guangmei1; Mao, Peili1; Xie, Baohua1; Mikle, Nate2; Yu, JB (reprint author), Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Zone Environm Proc & Ecol Remedia, Yantai 264003, Shandong, Peoples R China. gxhan@yic.ac.cn; jbyu@yic.ac.cn
Source PublicationAGRICULTURE ECOSYSTEMS & ENVIRONMENT
ISSN0167-8809
2014-10-15
Volume196Pages:187-198
KeywordEddy Covariance Ecosystem Co2 Exchange Coastal Wetlands Agricultural Reclamation Yellow River Delta
DOI10.1016/j.agee.2013.09.012
Contribution Rank[Han, Guangxuan; Xing, Qinghui; Yu, Junbao; Yang, Liqiong; Wang, Guangmei; Mao, Peili; Xie, Baohua] Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Zone Environm Proc & Ecol Remedia, Yantai 264003, Shandong, Peoples R China; [Luo, Yiqi; Li, Dejun; Mikle, Nate] Univ Oklahoma, Dept Microbiol & Plant Biol, Norman, OK 73019 USA
Department中科院海岸带环境过程与生态修复重点实验室
AbstractLittle is known about the impacts of agricultural exploitation of coastal wetlands on ecosystem CO2 exchange, although coastal wetlands have been widely reclaimed for agricultural use across the world. We measured net ecosystem CO2 exchange (NEE) and its major components, gross primary production (GPP) and ecosystem respiration (R-eco) using an eddy covariance flux technique in a natural coastal wetland (reed) and an adjacent, newly reclaimed farmland (cotton) in the Yellow River Delta, China. The results showed that agricultural reclamation changed the ecosystem CO2 exchange of the coastal wetland at three distinct levels. Initially, the conversion from the wetland to farmland changed the light response parameters (alpha, A(max), and R-eco, day) of NEE and temperature sensitivity (Q(10)) of R-eco mainly by changing the dominant vegetation type. Over the growing season, NEE, R-eco and GPP were significantly correlated with LAI at both sites and aboveground biomass at the farmland site. Next, the reclamation of wetland modified the diurnal and seasonal dynamics of ecosystem CO2 exchange. Significant differences in diurnal variations of NEE between the wetland and farmland sites were found during the growing season (with the exception of June and July). Seasonal means of daily GPP and R-eco values at the wetland site were higher than those at the farmland. Ultimately, the agricultural reclamation altered the CO2 sequestration capacity of the coastal wetland. The cumulative NEE in the wetland (-237.4 g Cm-2) was higher than that in the farmland (-202.0 g Cm-2). When biomass removal was taken into account, the farmland was a strong source for CO2 of around 131.9 g Cm-2 during the growing season. Overall, land use changes by reclamation altered ecosystem CO2 exchange at several ecological scales by changing the dominant vegetation type and altering the ecosystem's natural development. (C) 2013 Elsevier B.V. All rights reserved.; Little is known about the impacts of agricultural exploitation of coastal wetlands on ecosystem CO2 exchange, although coastal wetlands have been widely reclaimed for agricultural use across the world. We measured net ecosystem CO2 exchange (NEE) and its major components, gross primary production (GPP) and ecosystem respiration (R-eco) using an eddy covariance flux technique in a natural coastal wetland (reed) and an adjacent, newly reclaimed farmland (cotton) in the Yellow River Delta, China. The results showed that agricultural reclamation changed the ecosystem CO2 exchange of the coastal wetland at three distinct levels. Initially, the conversion from the wetland to farmland changed the light response parameters (alpha, A(max), and R-eco, day) of NEE and temperature sensitivity (Q(10)) of R-eco mainly by changing the dominant vegetation type. Over the growing season, NEE, R-eco and GPP were significantly correlated with LAI at both sites and aboveground biomass at the farmland site. Next, the reclamation of wetland modified the diurnal and seasonal dynamics of ecosystem CO2 exchange. Significant differences in diurnal variations of NEE between the wetland and farmland sites were found during the growing season (with the exception of June and July). Seasonal means of daily GPP and R-eco values at the wetland site were higher than those at the farmland. Ultimately, the agricultural reclamation altered the CO2 sequestration capacity of the coastal wetland. The cumulative NEE in the wetland (-237.4 g Cm-2) was higher than that in the farmland (-202.0 g Cm-2). When biomass removal was taken into account, the farmland was a strong source for CO2 of around 131.9 g Cm-2 during the growing season. Overall, land use changes by reclamation altered ecosystem CO2 exchange at several ecological scales by changing the dominant vegetation type and altering the ecosystem's natural development. (C) 2013 Elsevier B.V. All rights reserved.
SubtypeArticle
Funding OrganizationAgriculture ; Environmental Sciences & Ecology
Indexed BySCI
Language英语
WOS KeywordCARBON-DIOXIDE EXCHANGE ; QINGHAI-TIBETAN PLATEAU ; LAND-USE CHANGE ; GRASSLAND ECOSYSTEMS ; SEASONAL-VARIATION ; INNER-MONGOLIA ; WATER WETLAND ; SOIL ; CHINA ; VARIABILITY
WOS Research AreaAgriculture ; Environmental Sciences & Ecology
WOS IDWOS:000343019000023
Citation statistics
Cited Times:37[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.yic.ac.cn/handle/133337/8701
Collection中科院海岸带环境过程与生态修复重点实验室
中科院海岸带环境过程与生态修复重点实验室_滨海湿地实验室
Corresponding AuthorYu, JB (reprint author), Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Zone Environm Proc & Ecol Remedia, Yantai 264003, Shandong, Peoples R China. gxhan@yic.ac.cn; jbyu@yic.ac.cn
Affiliation1.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Zone Environm Proc & Ecol Remedia, Yantai 264003, Shandong, Peoples R China
2.Univ Oklahoma, Dept Microbiol & Plant Biol, Norman, OK 73019 USA
Recommended Citation
GB/T 7714
Han, Guangxuan,Xing, Qinghui,Yu, Junbao,et al. Agricultural reclamation effects on ecosystem CO2 exchange of a coastal wetland in the Yellow River Delta[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2014,196:187-198.
APA Han, Guangxuan.,Xing, Qinghui.,Yu, Junbao.,Luo, Yiqi.,Li, Dejun.,...&jbyu@yic.ac.cn.(2014).Agricultural reclamation effects on ecosystem CO2 exchange of a coastal wetland in the Yellow River Delta.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,196,187-198.
MLA Han, Guangxuan,et al."Agricultural reclamation effects on ecosystem CO2 exchange of a coastal wetland in the Yellow River Delta".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 196(2014):187-198.
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