Analysis And Suitability Evaluation Of Land Use Time And Space Change In Aksu City

In the context of the era of sustainable development as the theme and the new starting point of the continuous rise of territorial spatial planning,the importance of land use change analysis and its suitability evaluation has been highlighted again.At the same time,it is necessary to establish a unique index system and use more reasonable weight calculation methods.With the continuous development of economy and society,it is also promoting the changes of the land use types,which will inevitably lead to the problems of the suitability and unsuitability of land use,as well as the need to compare the changed conditions with the evaluated suitability.This paper took Aksu City as the research area,based on the analysis of land use changes from 2009 to 2018,according to the characteristics of the study area and the availability of data,a land use suitability evaluation index system had been constructed,The calculation of index weight is based on combination weight,that is,the combination of subjective weight and objective weight,and the final weight value is obtained,which had realized the evaluation of the land use suitability of each township in Aksu City.In the specific evaluation,with the help of the multi-criteria and multi-objective evaluation method,the suitability of the cultivated land,construction land of each township was calculated in GIS,and the study area was divided according to the suitability,and the evaluation results of suitable,relatively suitable,barely suitable and unsuitable were obtained.The final conclusions were as follows:(1)In terms of land use: from 2009 to 2018,There are more unused land in the land use type of Aksu City.Its multi-year average proportion was 71.17% and showed a downward trend.The remaining types that showed a downward trend included cultivated land and grassland.The proportion of forest land,construction land and water area showed an upward trend.Generally speaking,restricted by the natural environment,the proportion of unused land in Aksu City was much higher than the other types.However,human activities had caused significant changes in the status of land use in Aksu City.(2)In terms of suitability evaluation: After having evaluated the suitability of cultivated land,construction land,it was found that the area of unsuitable area of cultivated land was the largest,the area of relatively suitable area and barely suitable area were equivalent,and the area of suitable area was relatively small.The area of barely suitable areas of construction land occupied an absolute advantage,mainly distributed in the areas directly under Aksu City.In the forest and grassland,the relatively suitable areas had an absolute advantage,barely suitable areas and suitable areas occupied less,and unsuitable areas had the smallest area.(3)In terms of land use and suitability comparison: After having compared the suitability classification of cultivated land and construction land with the current situation of land use over the years,it could be concluded that most of the cultivated land and construction land were distributed in relatively suitable areas.The change trend of construction land in the relatively suitable areas was to decrease first and then increase.The area of cultivated land distributed in barely suitable areas showed a slow increase trend,while the area of cultivated land distributed in relatively suitable and suitable areas showed a decreasing trend.