Basic Research On Different Unit Land Use Methods Of Chaohu Water Basin And Its Influence On Water Quality

Basin water pollution is closely related to land use activities and is the most important factor affecting water pollution.As a result,the relationship between land use and water quality gradually become a hot research topic.In recent years,the economic of Chaohu Lake Basin(Chaohu Watershed)is developing rapidly.In the meantime,a substantial increase in urban and industrial land in the basin of land use also prompt major changes.What is more,the increase of agricultural nonpoint source pollution and industrial sewage has lead to a further deterioration of water quality.And the water pollution,eutrophication of rivers and lakes have become increasingly prominent.In this paper,we regard Chaohu Lake Basin as the research object.Combined with land use information and data from water quality monitoring indicators,we use a combination of GIS spatial analysis,sub-basin division based survey sites,correlation analysis,RDA analysis,dependency analysis and other technical methods to do the research.By analyzing the basic Chaohu Lake water environmental quality features and multi-scale space,we construct a statistical relationship model for Chaohu Lake Basin riparian zone and sub-basin,which includes different scale land use types,land landscape patterm and river water quality.Thus we can explore the influence of land use on river Water scale dependence.The results show that forest land and construction land are the most significant factors influencing river water quality.Moreover,construction land and poor water quality indicators of the size of the content are in a strong positive correlation,but a negative impact on water quality;woodland and poor water quality index content size is in a strong negative correlation,but on water quality conservation,purification plays a certain role.In the 50m－600m scale riparian zones,water and poor water quality index content size have a weak positive correlation.The arable land leads to an increasing and mobility characteristics of the water body pollution sources to the poor enhanced positive correlation between the size of the content of water quality objectives.Water quality produces some degree of side effects.Significant degree of interpretation rate is like woodland>construction land>farmland>waters.Wherein woodland and farmland explain rate 50m scale riparian zone of the highest body of water to explain the highest rate of construction land up to explain the rate at 300m scale riparian zone in the 500m scale riparian zone;woodland and farmland explanation rate 200m scale riparian band minimum construction land and water in the riparian zone of 50m scale interpretation lowest rate.The interpretation rate of various land use types in the sub-basin scale land use type on river water is significantly higher than the 50m-600m scale,which has more intense impact on water quality.In the 50m-600m scale riparian zone,only a small number of landscape pattern indices and individual water quality indicators show a significant correlation at the 0.05 level,which exhibit a significant correlation between the index and the remaining majority of landscape pattern of water quality indicators.In sub-basin scale,the largest patch index(LPI),landscape shape index(LSI),and contagion index(CONTAG),Shannon diversity index(SHDI)affect the water quality of major rivers Landscape pattern indices.In the explaining rate analysis,landscape shape index(LSI)shows a greater rate than other indicators landscape when landscape pattern indicators illustrate the most impact on the water quality of the river landscape shape index.Among them,the landscape shape index(LSI)interpretation of the lowest rate in the 100m scale riparian zone,the highest in the 600m scale riparian zone.50m to 600m in the scale with the lower riparian landscape pattern to explain the rate of the rest of indicators,when extend to sub-basin scale when IJI(IJI),landscape patch index(LPI),contagion index(CONTAG),landscape shape index(LSI),Shannon diversity index(SHDI)and explain to river water quality has great improvement.By revealing affecting relations at different scale conditions of Iand use and river water quality,this paper aims to refine proposed measures for land use to improve the water environment quality of Chaohu Lake basin water pollution control and water conservation.Moreover,this paper provides a scientific basis and theoretical support for the future socio-economic development planning and comprehensive management of Chaohu Lake Basin.