Study On Development Of Coupling Coordination Of Land Intensive Use And Ecological Security In Poyang Lake Basin

With the rapid development of our country's economy and the acceleration of urbanization,the contradiction between people and land was becoming more and more prominent.Although large economic benefits of land use have been obtained,what follows was the deterioration of the whole ecological environment.This paper took the Poyang Lake Watershed as the research area,namely the five river watershed(Xiushui River,Rao River Watershed,Xinjiang River Watershed,Fu River Watershed,Ganjiang River Watershed)and Poyang Lake district,based on the research progress at home and abroad and the status quo of the study area.From the aspect of land intensive use and ecological security,an index system was constructed.Using the PSR model,the land intensive use index system and land ecological security index system were constructed respectively.The weights were determined using the analytic hierarchy process and weighted function method was used for comprehensive evaluation.The results of the comprehensive evaluation of the ecological vulnerability were corrected and the final evaluation results were obtained.Using Coupling Coordination model,dynamic coupling analysis of land intensification and ecological security in Poyang Lake Watershed in 2005,2010 and 2015 was conducted to explore the coupling and coordination of land intensive use and ecological security in the Poyang Lake Watershed.Combined with the evaluation results,the comprehensive response of land intensive use and ecological security in Poyang Lake Watershed were analyzed.Research indicates:(1)The level of land intensive use in the Poyang Lake Watershed was higher and higher,the levels of land intensive use in the north were significantly higher than that in the south.Combined with the constructed PSR model and revised model analysis,it was concluded that the above results were mainly due to the obvious regional differences in the Poyang Lake Watershed.The impact of factors such as the terrain,regional natural ecological vulnerability,agricultural per capita net income,labor input per unit area,land occupation workforce and green coverage rate of the built-up area were significant.(2)Ecological security conditions of land in Poyang Lake Watershed were generally in a better and better trend.The ecological security level of the Poyang Lake Watershed was at a level that the north and south ends were higher and the middle was less.Combined with the constructed PSR model and revised model analysis,the above results were mainly due to the main factors such as terrain,vegetation coverage,natural ecological vulnerability,per capita cultivated land area,land area per capita,the proportion of agricultural farmers' income,the increase of unit cultivated land value,per capita green area and the proportion of the third industry in the proportion of GDP in the third industry.From the analysis of the interval differences,the unbalanced development in the six regions was the main reason for the difference in the level of land intensive use and ecological security in the Poyang Lake Watershed.(3)Coupling coordination degree of Poyang Lake Watershed showed that most of the regions were in a highly coordinated state.The coupling degree and coupling coordination degree basically showed the high state in middle area and the low state in both ends.There were six main space combinations.They were the middle coupling and the middle coordination area,the high coupling and the middle coordination area,the high coupling and the high coordination area,the extreme coupling and the high coordination area and the extreme coupling and the extreme coordination area.Based on the spatial-temporal differentiation pattern of the above-mentioned coupling degree and coupling coordination degree,natural resource conditions,socio-economic development level,traffic location,regional development planning and policies were the main factors affecting the changes in the spatial-temporal pattern of coupling coordination.The analysis of the unbalanced development in the six regions from the interval difference analysis is the main reason for the differences in the coupling degree and coupling coordination degree of the Poyang Lake Watershed.(4)Through the analysis of the ecological response of land intensive use and ecological security in the Poyang Lake Watershed,the Poyang Lake Watershed was divided into four grades according to the results of land intensive use evaluation: the high intensive area of the Poyang Lake plain in northern Jiangxi,the moderate intensive area of hilly plains in the central Jiangxi,low intensive area of the hilly land in the eastern Jiangxi-western Jiangxi and extensive area of hilly land in the southern Jiangxi.Through the dynamic analysis of land ecological security in the Poyang Lake Watershed,the Poyang Lake Watershed was divided into ecological zones by scientific systems,which were mainly divided into ecological good area of hilly land in the southern Jiangxi,ecologically sensitive areas of hilly land in the central Jiangxi,ecological risky area of the hilly land in the eastern Jiangxi-western Jiangxi and ecologically bad areas of Poyang Lake Plain and hilly land in northwestern and in northeastern Jiangxi.The CA-Markov model was used to simply predict the coupling degree of land intensive use and ecological security in the Poyang Lake Watershed in 2020.The forecast results showed that the coupling of extreme coordination in five years was increasing.