杭州城区及其边缘地区湿地反硝化潜力评价

以杭州湿地为例,对湿地反硝化强度及其特性进行了分析,结果表明:杭州市区及边缘地区的湿地由于受人类活动影响的不同及所处环境的差异,其湿地反硝化强度有较大的差异,反硝化强度在0.21～2.38 mg/(kg.h)之间,城市化并没有减弱湿地的反硝化强度,城区湿地的反硝化平均强度高于城市边缘区,农田湿地反硝化强度低于其它湿地;湿地反硝化强度主要与有机质含量、全氮、微生物生物量碳和细菌数量呈正比,而受质地、pH和CaCO3含量等的影响较小,因此,湿地系统中有机碳含量可作为其反硝化潜力的判断指标。

Denitrification Potential of Wetlands in Hangzhou City and Its Edge Areas

In this study,we measured the denitrification potential of 37 wetlands in the urban and edge areas of Hangzhou city,southeast China.The relationships between the denitrification potential and properties of wetlands were characterized.The results showed that the denitrification potentials of different wetlands were diverse due to the great disturbing by human and different environmental conditions,they ranged from 0.21 to 2.38 mg/(kg·h).Intensity of denitrification potential of wetlands in urban area was greater than that in edge areas,and that of farm wetlands was less than that of other wetlands.The fact that there were significant correlations between denitrification potential and C cycle-related variables(organic matter,microbial biomass C,number of bacteria) suggested that organic matter accumulation and C dynamics were critical controllers of variation in denitrification potential of wetlands in these urban and edge areas.