摘要
文章在野外布点采样的基础上分析了非点源污染评价指标,同时,利用GIS(地理信息系统)技术研究南海区内不同土地利用结构与非点源污染之间的关系。结果表明:在以单一土地利用类型为主控制的流域中,耕地控制的小流域的地表水水质明显好于城镇控制的小流域;在不同的土地利用类型的组合结构中,各项污染物浓度往往介于林地、基水地或耕地、城镇用地为主控制的小流域之间;在其他条件相似时,随着小流域内林地和基水地的增加,非点源污染程度有所降低,而随着耕地或城镇、农村居民点用地比例的升高,非点源污染有所增加。此外,土地利用结构对非点源污染的影响不仅表现在数量结构上,同时表现在空间分布上。
As point sources have been effectively controlled, non-point source pollution, especially agricultural pollution, would become the main factor affecting the surface water quality. On the base of field sampling and GIS techniques, the relationship between the land use structure and the surface water quality was investigated on the Nanhai district. The results are showed as follows. （ 1 ）In the catchment area where the land is used mainly in a single type, the quality of surface water in farmland is distinctly better than that in the village residential area. （2）In cases of land use in combined structure type, the concentration of pollutants is at the middle level of woodland, base water land and farmland.（ 3 ）The concentration of pollution from non-point source is decreased as the area of woodland and base water land is increased, while it is increased with the increase of the area of farmland. In addition, the land use structure also has effect on the space distribution of non-point source pollution.
出处
《广州环境科学》
2007年第3期35-38,43,共5页
Guangzhou Environmental Science
基金
湖南师范大学自然科学基金资助(0506639)
关键词
土地利用结构
非点源污染
南海
land use structure non-point source pollution Nanhai
