| Eco-system plays a vital role in the development and survival of human society,it’s fundamental for the supplying of natural resource,regulating of climate and water resources,and supporting of production and life,and it’s also the core for the development of regional socioeconomic.Therefore,human beings must pay high attention to the land ecological quality which is closely related to the human life.In order to objectively analyze and recognize the regional land ecological quality,it is generally necessary to quantify the Eco-environment,however,how to quantitatively describe the Eco-environmental quality and evaluate its condition has been a hot issue which is studied by experts and scholars in related fields for many years.Taking Ganjiang River Basin as the research area and Arc GIS 10.2 as the data analysis and mapping platform,the basic data support-Landsat series images of 2000,2005,2010,and 2015 was standardized in the ENVI5.5 platform,the regional MRSEI(Modified Remote Sensing Based Ecological Index)is calculated and analyzed by constructing the ecological environment quality assessment method system in the research area,and the land ecological quality and its dynamic changes in Ganjiang River Basin were studied form 2000 to 2015.The spatial pattern characteristics of MRSEI was clarified by analyzing the spatial auto-correlation of the land ecological quality index,and the geographical detector method was used to reveal the possible factors which would affecting the MRSEI.Combing with the aspects of “protecting ecological land,increasing greening ratio”,“increasing governance,improving ecological quality”,“strictly controlling urban construction and expanding,promoting rural environmental improvement”,“strengthening environmental publicity and ecological construction” and so on,the relevant countermeasures were put forward to optimize the land ecological quality of the basin so that it can provide scientific reference for the ecological environment protection of the Ganjiang River basin.The main results of the study are as follows:(1)The mean value of MRSEI in Gangjiang River Basin were respectively 0.619,0.521,0.613 and 0.678 from 2000 to 2015.In the past 15 years,there has been a dynamic evolution of the land ecological quality in Ganjiang River Basin,which was first deteriorated and then gradually improved.According to the analysis of the MRSEI classification chart,it can be seen that the areas with poor land ecological quality are mainly located in the northern part of Ganjiang River Basin(such as Nanchang City,Gao’an City,Fengcheng City,etc.),in which the social economy are more developed.The areas with better land ecological quality are mainly located in the south-central and central-western parts of Ganjiang River Basin with richer vegetation coverage.(2)Using the spatial auto-correlation model analyze the MRSEI in Ganjiang River Basin,the results showed that the global auto-correlation Moran’s I index of the MRSEI in the study area was respectively 0.7256,0.6820,0.7760,and 0.7264,which means that the spatial distribution of MRSEI in each period was significantly positively correlated.Moreover,the local Moran’s Ii indices in the study area were 0.7580,0.7205,0.8062 and0.7611,indicating that there was a positive spatial correlation between each calculation unit of the land ecological quality index in the study area,and the analysis combining with the LISA cluster diagram showed that most of the regions within the study area have no significant spatial correlation,the areas with more significant correlation mainly include high-high value aggregation areas and low-low value aggregation areas.(3)Using the geographical detector method,the analysis of the influencing factors of the MRSEI showed that 13 factors have some correlation with the MRSEI,and the proportion of forest land is the factor which has the strongest independent explanatory ability to the MRSEI in the past 15 years,and it is found that the independent interpretation ability of MRSEI by socioeconomic factors(annual average GDP,average annual population,etc.)is gradually increasing over time,indicating that its impact on the land ecological quality is becoming more and more significant. |
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