Spatial Variability of Greenhouse Gas Effluxes and Their Controlling Factors in the Poyang Lake in China
Lixiang Liu1,2, Ming Xu1,3, Mao Lin4, Xin Zhang4
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1Key Laboratory of Ecosystem Network Observation and Modeling,
Institute of Geographic Sciences and Natural Resources Research,
Chinese Academy of Sciences, Beijing 100101, China
2University of Chinese Academy of Sciences, Beijing 100039, China
3Department of Ecology, Evolution and Natural Resources, Rutgers University,
New Brunswick, NJ 08901, USA
4Beijing Forestry University, Beijing 100083, China
Pol. J. Environ. Stud. 2013;22(3):749-758
CO2, CH4, and N2O (GHG) emissions are globally important in China, but few field observations have been made in freshwater lakes. In this paper, we measured the GHG effluxes from 44 sampling locations among four sub-regions in Poyang Lake in China in October 2010 using floating chambers. The mean CO2, CH4, and N2O effluxes were 0.23 μmol m-2·s-1, 3.0 nmol·m-2·s-1, and 0.11 nmol m-2·s-1, ranging from -0.25 to 0.54 μmol·m-2·s-1, 1.4 to 8.9 nmol m-2·s-1, and 0.012 to 0.21 nmol·m-2·s-1 for the CO2, CH4, and N2O efflux, respectively. We found differently related tendencies between GHG effluxes and environmental parameters for each sub-region and, totally, four sub-regions together. The 16 environmental factors explained the GHG effluxes with 55%, 70%, and 89% of the variation in CO2, CH4, and N2O efflux, respectively, in Poyang Lake. Our analysis revealed that sediment C/N ratio, water depth, and the difference of air-water temperature were significantly contributing variables for GHG effluxes in the lake.
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