| Research on the landscape pattern is comparatively mature in arid areas,landscape pattern based on land use/cover, the landscape index of every class are analyzed. Landscape pattern and the study of hydrochemical characteristics has been pay great attention to in recent years, hydrochemical characteristics of each index will influence the landscape pattern.This article mainly in two aspects to study, further to explore the relationship between the two.In this paper, we selected the October 1990- October 2015 Landsat data, the image geometric correction processing methods, such as scaling, radiation, and so on.Selected October 2014 and October 2015 hydrochemical characteristics data,classifying and processing them. Under ENVI4.8 software and ARCGIS9.3 software applications, on the 6 image processing, by means of remote sensing for land use/cover classification, and through the use of Fragstats3.3 software for different land use types in the initial analysis of the landscape index. Of 21 on the basis of field sampling points to the buffer analysis, get the 1 km, 3 km, 5 km of land use, and use the Fragstats3.3 software to analyze the landscape index, got a different buffer within the scope of the land use type of landscape index. The landscape index of different land use types and two stage water chemical characteristics of the correlation research.In addition, the landscape index of different land use types through Canco software redundancy analyses and hydrochemical characteristics, further analysis of various land use type and the relationship between the hydrochemical characteristics index, so as to determine the effects of hydrochemical characteristic of landscape, and analyzes the change of the landscape and the details of the link between water chemistry.The results of the study is:(1) 25 years of land use/cover change of cultivated land, forest land, bare lake bed, desert, saline land area increased, water and other areais reduced. The landscape level, CA higher in 2013; NP in obvious increase in1990-2013, to 2014 peak; PLAND in 1990-2013 in other class proportion continue to reduce, rise the saline land proportion has a certain margin, cultivated land, other land types rise to 2015; Cultivated land of LPI peaked in 2014; Forest of PD from 1990 to1990, then fell, the forest land ED overall trend as the "W" shape.Landscape pattern level, LPI is larger, in 1990 and then gradually decline, increased to 2015; IJI increased first and then, from 1998-2013 change more gentle; CHOESION peaked in1990, began to decrease, but modestly to rise slightly in 2013; SHDI appear to increase after the first decreases, and decreased year by year from 2011 to 2011, 2015 at minimal overall level; SHEI first increases then decreases, 2014 index’s biggest;DIVISION from 1990 to 2011 increased year by year, and then gradually decreased.(2) The hydrochemical characteristic are as follows: in October 2014 in the surface water in KCl, MgSO4 both solute, and mainly aqueous solution is neutral;Exist in the surface water in October 2015 in CaCl2, MgSO4 both solute, from the point of pH, alkaline water quality. In October 2014 and October 2015, compared to the water quality changed from neutral to alkaline, instructions for acid ion in water quality restriction increase in the number of factors. Water pollution evaluation: two type of three samples have been varying degrees of pollution.(3) Under different mobile window, based on the relationship between landscape index and hydrochemical characteristic: When the concentration of Cl- rise to cause a decline in ED within 500 m window value; LPI is inversely proportional relationship with ion concentration; With the increase of SO42- concentration NP changes obviously; According as the decreasing of cation concentration,CONTAG gradually reduced. Different buffer, based on the relationship between landscape index and water chemical characteristics: In 2014, 1km and 5km buffer, landscape pattern index of forest has negatively correlated with hydrochemical characteristic;3km buffer,landscape pattern index of farmland has negatively correlated with hydrochemical characteristic.In 2015 1km and 3km buffer, landscape pattern index of forest has negatively correlated with hydrochemical characteristic;5km buffer, landscape pattern index of farmland has negatively correlated with hydrochemical characteristic. |
PDF Full Text Request