农业环境科学学报2013，Vol.32Issue(4)：771-777,7.DOI:10.11654/jaes.2013.04.017
巢湖流域河流沉积物N2O释放对水体溶存N2O贡献研究
N2O Flux Across Sediments-water Interface and Its Contribution to Dissolved N2O in the Chao Lake Tributaries, China
摘要
Abstract
An in situ incubation and measurement was conducted in November 2010 in Fengle River and Hangbu River,two major tributaries of Chao Lake,to investigate the impact of sediment on dissolved N2O in water column and the denitrification rate of sediments.Results showed that Fengle River and Hangbu River were both supersaturated with N2O with a mean concentration of 0.26±0.10 μg N-N2O·L-1(186 in percent saturation)and 0.18±0.04(SD)(151 in percent saturation) μg N-N2O· L-1,respectively.This suggested the studied rivers were potential sources of atmospheric N2O.The mean N2O flux across sediment-water interface was 0.39±0.44(SD) μg N-N2O· m-2· h-1 in Fengle River and 0.15±0.16(SD) μg N-N2O· m-2· h-1 in Hangbu River.It was estimated that about 89％ of the dissolved N2O in Fengle River and 45％ of the dissolved N2O in Hangbu River was contributed by river sediments.Denitrification rate in sediments was estimated through the reduction of nitrate over incubation time.The mean denitrification rate in sediments was 0.12±0.07 mg N ·m-2 ·h-1 in Fengle River and 0.10± 0.05 mg N· m-2· h-1 in Hangbu River,which is relatively low than values previously reported for different aquatic ecosystems.关键词
沉积物/溶存N2O/释放通量/反硝化速率Key words
sediment/ dissolved N2O/ release flux/ denitrification rate分类
资源环境引用本文复制引用
杨丽标,王芳,晏维金..巢湖流域河流沉积物N2O释放对水体溶存N2O贡献研究[J].农业环境科学学报,2013,32(4):771-777,7.基金项目
国家自然科学基金"河流溶存N2O及其在水气界面的交换过程"(20777073) （20777073）
国家自然科学基金"河流沉积物对水体溶存N2O贡献及其不同反硝化过程N2O产生速率研究"(41203080) （41203080）
