Investigation And Assessment Of Agricultural Non-point Source Pollution In Ebinur Lake Basin Based On 3S

Agricultural non-point source pollution has characteristics of wide randomness, wide range, complex forming mechanism, strong latency, hysteretic occurency and difficult management control. It offen relates to temperature, climate and other weather factors. With the development of the economy, Ebinur Lake Basin water quality has deteriorated, and the agricultural non-point source pollution has become the important pollution source to influence water quality, which directly restricts the social and economic development. With the development of the economy, Ebinur Lake Basin water quality has deteriorated, and the agricultural non-point source pollution has become the important pollution source to influence water quality, which directly restricts the social and economic development.This paper chose Ebinur Lake Basin as the research object. Through the way of on-site location for monitoring, and combining GIS, maps as well as statistics, the author produces a quantitative study of the source and contribution of agricultural non-point source pollution on the whole basin-scale, and identifies the key area of the pollution; It analyses the water quality of Ebinur Lake Basin by using the integrated pollution index method and principal component analysis, classifies the major water pollutant concentrations by TM images and the measured data, draws the thematic maps, and demonstrates the relationship between the basin landscape pattern and the key indicators of river water quality, as well as the degree of influence of river water quality affected by landscape type and human activities. On this basis, it proposes the optimization measures of watershed landscape pattern. The main conclusions of this paper are:(1) For the major pollution sources of Ebinur Lake Basin-animal manure pollution, urban domestic pollution, pesticide and fertilizer pollution of farmland,the standard pollution load ratio of lapsed pollutants is nearly the same; On the other hand, among the lasped pollutants of non-point source pollution-CODcr, BOD5, TN and TP, TN has the highest standard pollution load ratio, followed by TP and BOD5; From a regional perspective, Wusu City has the highest annual emissions of such standard, followed by Bole City, and Dushanzi District is the minimum.(2) Evaluating the present situation of Ebinur Lake Basin's water quality in 2008 and 2009 by the integrated pollution index method and principal component analysis method, the result shows that: the overall quality of water environment in 2009 is better than that in 2008, and the flat-water phase is better than the dry season. The main pollutant factors are TN, TP, As, Cd, Pb, CODcr and BOD5.(3) Discussing the space distribution of major water pollutants of Ebinur Lake Basin in 2008 by the remote sensing and geographic information systems technology, the result shows the characteristics of the whole space distribution are: the middle reach has the most serious pollution, and the upstream water quality was better than the lower. Through the analysis on both sides of 8km buffer, we can see that a strong relationship between river water pollution and landscape pattern.(4) Using the GIS and remote sensing to conduct extraction of landscapes information, classification, landscape pattern analysis and to draw the landscape type map, the paper ultimately divides the landscape pattern optimization control areas of Ebinur Lake Basin, which is controled by non-point source pollution control, into four categories: river sources of ecological protection areas, watershed ecological protection zone, nature reserve ecological protection zones and reservoir ecological conservation zone.The research ideas and methods of this paper for water environment of agricultural non-point source pollution in arid areas to provide a theoretical basis and technological support, the results can be used for future planning and watershed management in land reclamation important reference.