| Water crisis, which shows not only the water shortage, but also the deterioration of water quality, is increasing with the increase of human activities. In the form of water deterioration , non-point source pollution is given so widespread attention with its wide range of spatial and temporal distribution, spatial differences, strong uncertainty, difficult to gain information, complex composition and migration, the non-point source pollution will become major problems causing water pollution, particularly in the point source pollution control to a certain extent.In this paper, it is aim to qualitatively and quantitatively analyze of land use on nitrogen and phosphorus output, and landscape heterogeneity on the contribution of non-point source pollution, based on small watershed division and landscape pattern analysis, Yanji River Basin few be researched was chosen as object. Extracting land use characteristics and landscape heterogeneity by using FRAGSTATS (Landscape calculation software), and then discusses the influence of land use and landscape heterogeneity on nitrogen and phosphorus output .The results are:(1) TN and TP of Yanji River Basin showed significantly different temporal and spatial variation, pollutants concentration in water of downstream were higher than that of upstream, and after rain, pollutants concentration in water were significantly higher than that of pre-rain;(2) In Yanji River Basin, forest, high coverage grassland, water were the"sink"of the nitrogen and phosphorus; urban and rural residents point were the"source"of nitrogen and phosphorus. Dry land in the Yanji River Basin was not the main source of phosphorus that in water, was not play a role of source.(3) Under the circumstances of land use type both similar and significantly different, both showed that the greater landscape heterogeneity, the smaller nitrogen and phosphorus loss modulus, therefore compared land use basic types, landscape heterogeneity more effected on non-point source pollution. |
PDF Full Text Request