Appraisal Of Suitability Of Land Resources Spatial Development In Linshui County,Sichuan Province

At present,there is no perfect natural resource evaluation system model to learn from.In order to objectively grasp the spatial distribution of land quality,build a complete and highly applicable comprehensive evaluation index system of land quality.This study will combine GIS and RS technologies to evaluate the two different land use types of cultivated land and forest land in Linshui County,Sichuan Province.Establish a land resource suitability evaluation system under different land-use types,and take ecological risks,geological disasters,mineral resources,and geothermal resources as the correction factors of the evaluation results.The main reason is that the Se content of rice seeds and corn seeds is relatively high,the overall cultivated land quality in Linshui County,Sichuan Province is good,and the area of the cultivated land quality above medium level accounts for 95%.The area of broad-leaved forests did not change much after correction.Coniferous forest quality suitability evaluation before and after the correction is less excellent area,mainly in the third grade.By analyzing the good and bad indicators that affect the suitability evaluation of cultivated land and forest land,it is found that most of the soil chemical indicators of the soil chemical index of the soil environment index is the most advantageous factor,followed by the soil nutrient index.From the perspective of inferiority factors,the degree of water security is the inferiority factor in most areas;in general,in coniferous forests and broad-leaved forests,the climate index is the dominant factor,and the biological index is the inferiority factor.The single index evaluation factors of each part are quickly and accurately obtained using GIS technology and RS technology,and the digital elevation model(DEM)data is used to obtain the slope and aspect data of the study area through the surface analysis tool of GIS technology;the RS data is used to preprocess the image data,accurate Evaluate the characteristics and distribution characteristics of biomass and biodiversity in the study area;obtain spatial data such as soil nutrients,irrigation water environment indicators,effective soil layer thickness,texture,biodiversity index,biomass and other single indicators through spatial interpolation.Increase the cultivated land area through land changes and adjustments,increase economic productivity and promote economic development.We believe that part of the scrubland and grassland can be adjusted to cultivated land.Finally,through appropriate planning,the area that can be adjusted to cultivated land is 84.00 km2.It provides a scientific basis for forest land utilization and agricultural development in Linshui County,Sichuan Province.