摘要
平原水网区太湖流域非点源污染所占比例越来越重,非点源污染不确定性致使难以准确分析其流失规律。利用经率定验证的非点源污染模型AnnAGNPS模拟太湖流域雪堰镇平原水网圩区全年及各月非点源污染氮磷流失负荷,分析氮磷负荷时空分布规律,识别污染关键源区,通过对模型参数进行敏感性分析,定量评价最佳管理措施氮磷防控效果。结果表明,雪堰镇非点源污染氮磷负荷分别为62.99t/a、5.81t/a,流失高峰期在夏季。氮磷流失主要集中在坡耕地区和河道两侧,氮在施肥量大的地区也有大量流失。4种管理措施中,等高耕作、保护性耕作对颗粒态氮、磷削减效果明显,生态缓冲区、减少施肥量对氮削减效果明显。
The non-point source pollution has been growing to large proportion in the Taihu Lake Basin in water net plain.It was difficult to study the law of nitrogen and phosphorus loss due to their complicated characteristic.The calibrated and verificated AnnAGNPS model was applied to simulate the load of nitrogen and phosphorus from non-point source pollution monthly and yearly in the Taihu Lake Basin in polder area of water net plain.And then their temporal and spatial distribution were analyzed,critical source areas were identified and the effects of best management practices to control the nitrogen and phosphorus pollution based on sensitivity analysis were evaluated.The results showed that the nitrogen and phosphorus load were 62.99t/a and 5.81t/a,respectively,both with loss peaks in the summer.The loss of nitrogen and phosphorus mostly happened on slopping field and banks of river.Besides,highly fertilized areas had high nitrogen loss.Thus,it was reasonable to select the appropriate best management practices according to practical condition.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2013年第S1期75-82,共8页
Resources and Environment in the Yangtze Basin
基金
水利部公益性行业科研专项(200801028)
中央级公益性科研院所科研专项基金项目(Y513001
Y513011)
关键词
平原水网圩区
太湖流域
非点源污染
ANNAGNPS
最佳管理措施
polder area in water net plain
the Taihu Lake Basin
non-point source pollution
AnnAGNPS
best management practices
