Study On Land-use Landscape Pattern Optimization Of Bayan County

Land-use landscape pattern optimization is the realization of the limited land resources in effective way between various departments to ensure the rational allocation of land use, economic benefit, social benefit and ecological benefit coordination. Bayan county is located in the black soil area of Songnen Plain, is a typical agricultural county, is our country’s important commodity grain production base. But with the rapid economic development, urbanization level increases rapidly, people’s increasing demand for land resources and unreasonable land use, the land ecological system is facing great pressure, environmental pollution, soil salinization, more serious soil erosion, the ecological environment in a serious threat. The land-use landscape pattern analysis and optimization of Bayan county will provide ideas and new guidance for rationally using land resources.This paper taking Bayan County as the study area, using RS,GIS and the landscape analysis program Fragstats3.3, explored the characteristics of the landscape index with the grain size change, combining with the area loss, and ultimately determined the optimal grain size for analyzing land-use landscape pattern. Analyze the land-use landscape spatial pattern of Bayan County, from four aspects of landscape construction of space, spatial form, spatial relations, spatial configuration, and reveal the existing problems. Apply accumulative cost distance model to identification landscape pattern optimization component, extract ecological sources, construct ecological corridor and ecological nodes, in order to get landscape pattern of land-use space optimization scheme. Optimize the land-use structure of grey linear programming model, to control the number all types of land use area.The results showed that:(1) Part of landscape indices and grain size could be fitted to a mathematical function relationship, and determine the optimal grain size for100m.Dry land and woodland were the main land-use landscape types of the study area, especially dry land had a clear advantage of the landscape, and were the landscape matrix. The waters were of the most complex spatial form, woodland and dry land and other agricultural landscape of irregular shape, construction land and garden plot of the most simple shape due to human interference. Dry land and construction land was evenly distributed, paddy field and other land of a more reasonable distribution, woodland, grassland and waters in each township of big distribution difference, garden plot distribution of disparity gap.The whole landscape was in small heterogeneity, composed of large patches reunion, and the shape complexity was moderate, the degree of fragmentation not serious, landscape stability poor.(2) The land-use landscape pattern spatial optimization. Expand and protect the original ecological sources, constructing new ecological source, repairing the existing ecological corridor, to build a new ecological corridor. Get the ecological node, to link the source of ecological corridor, forming a pattern of ecological networks point, line, face each other interweave, ecological function effective;(3) The Land-use structure optimization.635.33hm2reduced the area of cultivated land, forest land area increased by3740.86hm2, orchard increased32.99hm2,3032.92hm2grassland area decreased, the increase in urban land401.14hm2, traffic land increased by300.72hm2, the rural residential land reduced by736.81hm2, independent industrial and mining land, special land and water area is basically stable, other land reduced by72.61hm2.