鄱阳湖区农业面源污染时空分布研究

根据农业面源污染主要构成,分析了2000～2010年鄱阳湖区25个县市农业面源污染TN、TP和COD负荷的时空分布。结果表明:2000～2010年鄱阳湖区农业面源污染TN负荷总量由37952 t增长到42108 t,单位耕地面积TN负荷几乎没有发生改变,但比全省平均水平高出26.4%;TP负荷总量由9905 t增长到12230 t,单位耕地面积TP负荷由11.2 kg/hm2提高到13.2 kg/hm2,比全省平均水平高出31.4%;COD负荷总量由142162 t增长到183206 t,单位耕地面积COD负荷由161 kg/hm2提高到197 kg/hm2,比全省平均水平高出28.7%。农业面源污染排放总量较大的县市主要分布在高安市、南昌县、丰城市、东乡县等;单位耕地面积排放强度较大的县市主要集中在东乡县、万年县、余江县、新干县等。并提出了相应的对策措施。

Study on Temporal-spatial Distribution of Agricultural Non-point Source Pollution in Poyang Lake Region

Based on the main constitution of agricultural non-point source pollution,this paper analyzed the temporal-spatial distribution of TN,TP and COD loads of agricultural non-point source pollution in 25 counties(cities) in the Poyang Lake region during 2000~2010.The results showed that: from 2000 to 2010,the total TN load of agricultural non-point source pollution increased from 37952 t to 42108 t,and the TN load per unit area farmland did not change almost,but it was 26.4% higher than the average in Jiangxi province;the total TP load increased from 9905 t to 12230 t,and the TP load per unit area farmland increased from 11.2 kg/hm2 to 13.2 kg/hm2,which was 31.4% higher than the average in Jiangxi province;the total COD load increased from 142162 t to 183206 t,and the COD load per unit area farmland increased from 161 kg/hm2 to 197 kg/hm2,which was 28.7% higher than the average in Jiangxi province.The larger emission amount of agricultural non-point source pollution was mainly found in Gao’an city,Nanchang county,Fengcheng city,Dongxiang county etc.,and the higher emission intensity of agricultural non-point source pollution per unit area farmland was mainly focused on Dongxiang county,Wannian county,Yujiang county,Xin’gan county and so on.Finally,this paper put forward the relevant countermeasures against the agricultural non-point source pollution.