生态学杂志2012，Vol.31Issue(8)：2112-2118,7.
鄱阳湖秋季水-气界面CH4排放通量的区域差异及影响因素
Spatial heterogeneity and controlling factors of autumn CH4 flux at water-air interface in Poyang Lake of Jiangxi Province, China
摘要
Abstract
Limited observation stations and high spatial heterogeneity of CH4 flux are the challenges for the accurate estimation of CH4 flux at water-air interface. Poyang Lake is the largest freshwater lake in China. In order to understand the autumn CH4 flux at the water-air interface in the Lake, closed static chambers and gas chromatography were adopted to measure the CH4 fluxes at the water-air interfaces in 4 inner lakes of the Lake in October 2010. The environmental factors including meteorological variables and sediment- and water properties were also measured. The mean CH4 flux in the Duchang inner lake was 0. 26 mg · m-2 · h-1 , which was obviously higher than that in the inner lakes Xingzi (0. 15 mg · m-2 · h-1 ) , Wucheng (0. 13 mg · m-2 · h-1 ) , and Nanjishan (0. 10 mg · m-2 · h-1). The Lake had a mean CH4 flux of 0. 17 mg · m-2 · h-1, with the coefficient of variation being 58. 6%. The CH4 flux was positively correlated with wind speed (P<0. 01). After excluding the wind speed exceeding 5 m · s-1, the contents of sediment organic carbon and water body ammonium were significantly positively correlated with the CH4 flux. The dissolved organic carbon (DOC) content in water body was negatively correlated with the CH4 flux (P<0.05). The accurate estimation of the CH4 flux in the Lake would depend on more frequent measurements in larger areas.关键词
鄱阳湖/CH4排放通量/空间异质性/风速/溶解有机碳Key words
Poyang Lake/ CH4 flux/ spatial heterogeneity/ wind speed/ dissolved organic carbon (DOC).分类
资源环境引用本文复制引用
林茂,徐明,耿玉清,刘丽香,张鑫..鄱阳湖秋季水-气界面CH4排放通量的区域差异及影响因素[J].生态学杂志,2012,31(8):2112-2118,7.基金项目
林业公益性行业科研专项(200804005)资助. （200804005）
