Study On Land Use System Health Evaluation In Poyang Lake Eco-economic Zone

Land is the foundation of economic development and the most basic resource for human survival.With the socio-economic development and population growth,the contradiction between man and land has become increasingly prominent,and land resources have become increasingly scarce and precious.In this context,the irrational use of land threatens the sustainable development of the social economy and the stability of the land use system.The land use system is a natural,economic,and social compound system based on land use.Research on the land use system helps to promote harmony between society,economy,and ecology,and promotes the sustainable development of human society and has great practical significance.This article takes the 31 counties(cities,districts)included in Poyang Lake Ecological Economic Zone as research objects,and 2005,2010,and 2015 as research time scales.Using eCognition and ArcGIS software to interpret remote sensing images and extract six types of land use,such as cultivated land,forest land,construction land,water,grassland,and unused land,and analyze the changes in land use quantity and structure,and propose the problems of land use.On this basis,24 indicators were selected based on the PSR framework to build the index system,the weights of the indicators were determined using the entropy method,and the TOPSIS method was used to calculate the regional health index of the land use system in each region and within the region,and spatial-temporal analysis was conducted to find obstacle indicators.And put forward corresponding regulation advice.Research indicates:(1)The type of land use in the study area is mainly cultivated land and forest land,and the proportion of the two is more than 70%;the most changeable land category from2005 to 2015 is cultivated land and construction land,which shows that the amount of cultivated land decreases and the number of construction land increases;from land use Type dynamics analysis,basically the annual rate of change in various categories from2010 to 2015 is greater than the annual rate of change from 2005 to 2010,which indicates that the intensity of land development in 2010-2015 is greater than 2005-2010;the Shannon diversity index in the study area In the period from 2005 to 2015,there was an upward trend,but some areas showed a downward trend,reflecting that the single land type gradually took a dominant position in these districts,which was not conducive to the health of the land use system and needed attention;the fragmentation index in the study area continued to increase and sharply increased in 2010-2015.It reflects that human activities have increased the intensity of land use and affected the health status of land use systems.(2)The health index of land use system in the study area has kept rising during theperiod from 2005 to 2015,and the health status of its land use system has changed from unhealthy in 2005 to sub-health in 2015,and has continued to be a good trend;In 2005,the spatial pattern showed that the land use system health index value decreased from the core area to the edge but the overall distribution was relatively scattered.In 2010,the land use system health index value was lower in the south-central and south-western regions of the center,and in 2015 the performance showes that the land use system health index value of most central regions except the individual region are relatively lower.The range of land use health index value in 2015 was the lowest in three years,reflecting the healthy and harmonious development of the land use system health level in the overall regional pattern.Through the analysis of subsystems in areas with large time variations and large spatial differences,and comparing the detailed refinement indicators one by one,we found that the main obstacles affecting the evaluation results are: the amount of chemical fertilizer used per unit area of cultivated land and the amount of plastic film used per unit of cultivated land.The amount of pesticides used per unit of arable land,economic density,average fixed asset investment,investment in environmental governance,the proportion of GDP,the total power of agricultural machinery,etc.In the process of promoting the coordinated development of land use system health and ecological economy,more attention should be paid to the improvement of these indicators.Based on the obstacle indicators and combining with the actual local conditions,the corresponding regulation and improvement measures are proposed in order to provide theoretical references and solutions for the balanced sustainable development of Poyang Lake Ecological Economic Zone and other areas of land use.