深圳农业面源污染与近岸水体富营养化关系研究Ⅰ.农业陆源排污分析

主要从深圳市农业对水体的陆源污染包括农田化肥流失和畜禽养殖业排污等污染源出发,通过对农业化肥施用量和施用强度、畜禽养殖业排污变化趋势分析,估算出二者各自污染物排放量,探讨其与深圳近海水体污染变化趋势间的关系。对相关数据分析表明:(1)深圳市农业化肥流失是深圳近海水体富营养化成因之一,其在1994年之后对近海水体污染程度加大;(2)深圳市畜禽养殖业排污是深圳近海水体富营养化主要成因之一,其在1997年之后对近海水体污染程度加大;(3)农业化肥流失和畜禽养殖业排污主要受农业用地面积、农业政策的影响。

Relationship between Shenzhen agricultural NPS and eutrophication of coastal water Ⅰ. The analysis of discharging pollutants from agricultural land sources

The coastal water in Shenzhen could be seriously polluted by agricultural land source including the loss of chemical fertilizer(LCF) and livestock and poultry breeding(LPB).By analysis of the using amount and intensity of chemical fertilizer and the status of LPB,the discharging amount of the pollutants from the two sources was estimated,and the relationship between the amount of pollutants and the changing trend of the coastal water pollution was discussed.The data analysis demonstrated that:(1) LCF in Shenzhen was one of the reasons of the eutrophication of coastal water in Shenzhen,which caused more serious coastal water pollution after 1994;(2) LPB in Shenzhen was one of the main reasons of the eutrophication of coastal water in Shenzhen,which caused more serious coastal water pollution after 1997;(3) the pollutions coming from LCF and LPB in Shenzhen were mainly influenced by the areas of the agricultural land,agricultural policies.