Publication Date:
2012-11-17
Description:
Using the Eddy Covariance (EC) technique, we analyzed temporal variation in net ecosystem CO 2 exchange (NEE) and determined the effects of environmental factors on the balance between ecosystem photosynthesis and respiration in a reed ( Phragmites australis ) wetland in the Yellow River Delta, China. Our results indicated that diurnal and seasonal patterns of NEE and its components (ecosystem respiration ( R eco ), gross primary production (GPP)) varied markedly among months for the growing season (May to October). The cumulative CO 2 emission was 1,657 g CO 2 m −2 , while 2,612 g CO 2 m −2 was approximately accumulated as GPP, which resulted in the reed wetland being a net sink of 956 g CO 2 m −2 . The ratio of R eco to GPP in reed wetland was 0.68, which was close to other temperate wetlands. Soil temperature and soil moisture exerted the primary controls on R eco during the growing season. Daytime NEE values during the growing season were strongly correlated with photosynthetically active radiation. Aboveground biomass showed significant linear relationships with 24-h average NEE, daytime GPP, and R eco , respectively. Thus, we conclude that the coastal wetland acted as a carbon sink during the growing season despite the variations in environmental conditions, and long-term flux measurements over these ecosystems are undoubtedly necessary. Content Type Journal Article Pages 1-13 DOI 10.1007/s12237-012-9572-1 Authors Guangxuan Han, Key Laboratory of Coastal Environment Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Chunhui Road 17, Laishan District, Yantai, Shandong 264003, China Liqiong Yang, Key Laboratory of Coastal Environment Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Chunhui Road 17, Laishan District, Yantai, Shandong 264003, China Junbao Yu, Key Laboratory of Coastal Environment Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Chunhui Road 17, Laishan District, Yantai, Shandong 264003, China Guangmei Wang, Key Laboratory of Coastal Environment Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Chunhui Road 17, Laishan District, Yantai, Shandong 264003, China Peili Mao, Key Laboratory of Coastal Environment Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Chunhui Road 17, Laishan District, Yantai, Shandong 264003, China Yongjun Gao, Department of Earth and Atmospheric Sciences, University of Houston, Houston, 77204-5007 TX, USA Journal Estuaries and Coasts Online ISSN 1559-2731 Print ISSN 1559-2723
Print ISSN:
1559-2723
Topics:
Biology
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Geography
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Geosciences
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