农村非点源污染对赤田水库营养化水平的影响研究

Study on the Effects of Rural Non-point Source Pollution on Trophic State Level of Chitian Reservoir

为了评估农村非点源污染对水库水体营养化水平的影响,以三亚市赤田水库为例,分析了赤田水库库区非点源污染的构成类型及其污染量,根据模型预测了非点源污染对水库水体TN、TP的贡献浓度,在此基础上,提出了以非点源污染对水库水体TN、TP贡献浓度与实际监测浓度之比来评估农村非点源污染对水库水体营养化水平的影响。结果表明:农村非点源污染是库区的主要污染源,而主要污染类型为农业生产活动。非点源污染中,农业生产污染贡献率为82.5%,畜禽养殖和农村生活污染贡献相对较小,其污染贡献分别为9.3%和8.2%。赤田水库库区的农村非点源污染对整个库区污染物COD、TP和TN的贡献率分别达到了95.3%、93.2%和91.6%。库区农村非点源污染对赤田水库TN质量浓度的贡献为0.236 mg/L,TP质量浓度的贡献为0.0086 mg/L。农村非点源污染的TN和TP对水库的N和P的营养化水平的贡献率分别为72.9%和71.3%,可见,非点源污染是赤田水库水体营养盐的主要贡献者。

In order to evaluate the effects of rural non - point source pollution on water trophic state level,the article takes Chitian Reservoir as an example and analyzes the composition and load of non - point source pollution in Chitian Reservoir. At the same time, the model predicts the non - point source pollution＇s contribution concentration of TN and TP in water. Based on that, the article proposes that the ratio of non -point source pollution＇s contribution concentration of TN and TP and actual monitoring concentration can be used to study the effects of rural non - point source pollution on trophic level of Chitian Reservoir. The results show that rural non - point source pollution is the main pol- lution source and the pollution type is the agricultural activities. In the non - point source pollution,the pollution con- tribute rate of agricultural production is 82. 5% , while that of livestock breeding and rural domestic is relatively small,which is 9.3% and 8.2% respectively. In Chitian reservoir,the non -point source pollution＇s contribution rate of COD,TP and TN reaches 95.3% ,93.2% and 91.6% respectively. The mass concentration of TN and TP caused by the rural non - point source pollution reaches 0. 236 mg/L and 0. 0086 mg/L respectively. The contribution rate of TN and TP caused by rural non - point source pollution to the trophic state level of N and P is 72.9% and 71.3% respectively. Therefore, the article can get a conclusion that the main contributor to trophie state level of Chitian Res- ervoir is rural non -point source pollution.