太湖流域非点源氮污染对水质影响的定量化研究

Quantity of Nitrogen from Non -Point Source Pollution in Taihu Lake Catchment

采用田间实验与实地调查相结合的方法,研究了太湖一级保护区武进市雪堰镇水稻季节各种类型非点源氮污染的负荷分配情况。结果表明,雪堰镇各种类型农业非点源污染中,农田氮排放总量为24166kg,占排放总量的72.7%;农村居民氮排放总量为6272kg,占排放总量的18.9%;城镇居民氮排放总量为2400kg,占排放总量的7.2%;养殖业氮排放总量为392kg,占排放总量的1.2%。在当前的非点源氮污染治理中,除采取有力措施控制农田养分外,农村和城镇居民生活污水和人粪尿的排放也应引起重视。

The contribution of nitrogen in ric e season from non -point source pollu tion(NPS)of Taihu Lake catchment was inves-tigated through a case study and surv ey in Town of Xueyan,Wujin city.The r esults showed that about 72.7%of total nitrogen discharged into water body of Xueyan from farmland,18.9%from village re sidents,7.2%from human manure and u rine in townsfolk,1.2%from livestock.The amount of each source is about 24166k g,6272kg,2400kg and 392kg,respectively.Therefore,besides the strict contr ol of nutrient during farming,much a ttention should also be taken into th e sanitary sewage fromtown and countryside when controlling non -point source pollution.