镇江丘陵区农业流域土地利用对氮素输移的影响

Nitrogen Transportation in Relation to Land Use in Agriculture Catchment of Zhenjiang Hilly Region

为研究镇江丘陵区句容水库流域土地利用对氮素输移的影响,构建了句容水库流域SWAT模型,分别采用2005～2007年的径流数据对径流模型进行率定和验证、2007年的氮浓度监测数据对氮负荷模型进行验证,并计算了流域不同土地利用类型上有机氮及硝态氮的输出、模拟了有机氮和硝态氮流失在年内的分布。结果发现有机氮输出量强度、硝态氮随径流输出强度及流失年内逐月分布规律;居住地面积比例、地表径流和氮负荷都随着林地面积的减少而增大。

SWAT model is used to research on the effcet of land use on the nitrogen transportation in Jurong reservoir catchment of Zhenjiang hilly region.The runoff data from 2005 to 2007 and nitrogen concentration monitoring data of 2007 in the catchment are used to calibrate and verify the model.The annual organic nitrogen and nitrate nitrogen output intensity on the different land use types are calculated.The distribution law of the organic and nitrate nitrogen loss in a year is simulated.The results show that with the decrease of the forest land area,the organic nitrogen output intensity,the monthly distribution law of the nitrate nitrogen output intensity and loss with the runoff,the residential area proportion,the surface runoff and the nitrogen loading are increased.