人为活动N对太湖地区水体中溶解N_2O的影响

从2000年9月到2001年9月,每月两次采样连续监测太湖地区湖、河和井水水体中溶解的N2O浓度、NO-3-N和NH4+-N浓度及水温的变化,研究了湖、河、井水体NO-3-N和NH4+-N浓度对水中溶解N2O浓度的影响。结果表明,湖、河和井水中溶解的N2O浓度与NO-3-N浓度呈显著正相关关系,也与水温呈正相关,而与NH4+-N浓度无显著相关关系。结果还表明,浅水型水体高浓度NO-3-N和NH4+-N的存在均是N2O产生的源;水体反硝化作用和硝化-反硝化均是水中产生N2O的重要途径。

Impacts of Anthropogenic N on Dissolved N2O Concentrations in Aquatic Systems of Taihu Lake Region

The anthropogenic N has greatly influenced the dissolved nitrous oxide (N2O) in aquatic systems. N2O concentrations dissolved in lake, river and well water in Taihu Lake region and N2O fluxes from these water surfaces were monitored twice a month in three replicates during the period of Sept.26, 2000 to Sept.26, 2001 along with concentrations of -N and -N and water temperature. Results also indicated that there existed significantly positive relationship between dissolved N2O concentration and NO3, contributing to the high concentration of -N and -N, both could contribute to high concentration of dissolved N2O. Our results indicated that the dissolved N2O has been derived from the high concentration of anthropogenic N and both nitrification and nitrification-denitrification contribute to N2O production in theaquatic systems.