太湖地区湖水与河水中溶解N_2O及其排放  

Dissolved N_2O Concentrations and N_2O Emissions from Aquatic Systems of Lake and River in Taihu Lake Region

作　　者：熊正琴[1] 邢光熹[1] 沈光裕[1] 施书莲[1] 杜丽娟[1] 

机构地区：[1]中国科学院南京土壤研究所物质循环开放实验室,南京210008

出　　处：《环境科学》2002年第6期26-30,共5页Environmental Science

基　　金：国家自然科学基金重大项目 (39790 10 0 ) ;国家自然科学基金项目 (499710 4 8)

摘　　要：水体是N2 O排放的重要来源 .2 0 0 0 0 9～ 2 0 0 1 0 9,每月 2次采样 (重复 3次 )连续监测太湖地区太湖和大运河水体N2 O排放通量和水中溶解的N2 O浓度 ,还同时监测不同深度水样中的N2 O浓度 .结果表明 ,太湖N2 O N的年均排放通量为 3 5 3 μg/(m2 ·h) ,而大运河已高达 1 2 2 5 μg/(m2 ·h) .太湖湖水中溶解N2 O N浓度为 0 3 6μg/L ,大运河河水中浓度高达 1 1 3 1 μg/L ,浅水型水体是N2 O排放的源 .结果还表明 ,不同深度水中N2 O浓度差异不明显 ,而时间差异显著 .水面N2 O的排放通量和水中溶解的N2 O浓度呈显著正相关关系 ,二者又都与水温呈显著正相关 .Aquatic systems are an important source of N 2O emissions. N 2O concentrations dissolved in lake and river water in Taihu Lake region and N 2O fluxes from these waterbodies were monitored twice a month in three replicate from Sept. 26, 2000 to Sept. 26, 2001. At the same time, both top and bottom water were analyzed for N 2O concentrations four times in a consecutive year. Results demonstrated that rather high N 2O N concentrations of 11.31 μg/L were dissolved in river water and resulted in high N 2O N fluxes of 122 5 μg/(m 2·h) from river water surfaces while low N 2O N concentration of 0 36 μg/L and N 2O N flux of 3 53 μg/(m 2·h) was found in lake water. No obvious difference was found in dissolved N 2O concentration between top water and bottom water. Results also indicated that there existed significantly positive relationship between dissolved N 2O concentration and N 2O flux and water temperature. The results indicate that the aquatic systems are an important source of N 2O.

关 键 词：太湖地区 湖水 河水 水体 氧化二氮 气体排放 溶解度 

分 类 号：X832[环境科学与工程—环境工程]