The Spatial Structure Evaluation Of Urban Ecological Land In Yanji

The city is the dominant social economic natural complex ecosystem by human activities. The city of accelerated development and city population increase, increase the city ecological land destruction, ecological land use protection contradiction between cities economic development is increasing. The city of Yanji ecological evaluation using a quantitative analysis and spatial structure of the status of the use of this paper, provide the basis for city planning and sustainable development of Yanji.The City ecological land classification, combining data and actual situation of Yanji, the land in Yanji with the type division of the 7 type of land,11 of two types of land use. Mainly divided into farmland, woodland, garden, green (green parks, green square, protective green and green courtyard), water (artificial wetland and natural wetland), other ecological land and non ecological land.The ecosystem of Yanji city spatial structure by quantitative analysis, on 1990, 2005 and 2013in Yanji, graphic images of translation by ArcGIS, generation of urban ecological land in Yanji city land type vector, raster landscape index after using Fragstats4.2 to calculate the landscape index of core, every year to carry on the analysis, finally reached the Yanji ecological use the dynamic changes of spatial structure. From 2005 to 2013, the study area,plaque area advantage of farmland is the biggest, followed by woodland and non ecological land; ecological land, except the area of green space and gardens increased, the remaining 4 categories are different degrees of reduced; the ecological land is non ecological land of about 295 hectares; landscape index, ecological fractal patch and the average shape index are elevated, suggested that the ecological land is non ecological land division more and more broken, but diversity is relatively increased, Yanji ecological protection work for with great potential; Yanji is in the space direction, the ecological land is mainly along the river erosion, which Park West and Institute of science and technology, northwest and southeast of the several directions of eroded the most serious.Urban ecological land in Yanji spatial structure evaluation, this paper uses 3 criteria layer,15 indexes layer construction of urban ecological land in Yanji spatial structure evaluation index system, indicators selected from acquiring difficulty on ecological land use degree, image and other aspects to consider. By using the AHP analytic hierarchy process to establish judgment matrix and consistency inspection, determine the weight of each index system of value. Then the actual value of index dimensionless, finally obtains the comprehensive evaluation value. Results show that the urban ecological land in Yanji city in 05and 13 spatial structure evaluation value is 0.5575and 0.5050, all are in the Ⅲgrade, on the Yanji ecological land space structure is unreasonable, the ecological benefit of general. In the planning the process of Yanji in the future, we should strengthen the protection of the forest, and the optimization of water and the the environment of the water around.