| Based on the land use change data and social economic data of Linchuan District at the end of 2005,2010 and 2015,this paper uses the land use degree comprehensive index,land use transfer matrix,land use structure information entropy index and location index to study the land in the study area.Analyze the temporal and spatial evolution of the types;explore the influencing factors of land change from the aspects of population,economy and policy;modify the ecological service value equivalent factor according to the actual situation of the study area,and dynamically evaluate the value of ecosystem services;use in ArcGIS 10.2 The GlobalMoran'sI Index and Getis-OrdGi* Index analyze the spatial correlation and agglomeration of ecological service value;analyze the correlation and coordination degree of land use and ecosystem services,and finally propose a land optimization strategy based on ecosystem service improvement..The research conclusions are as follows:(1)Looking at the temporal and spatial evolution of land use in Linchuan District from 2005 to 2015,it is found that forest land and arable land are the main types of land use,and the proportion of construction land is increasing year by year.The land use degree in most areas of Linchuan District is on the rise,the diversity of land use is low,and the degree of land concentration is declining.There are also obvious regional differences in the dynamic changes of land use types.The increase of construction land area mainly comes from cultivated land and woodland.Arable land and unused land have general advantages in Linchuan District,woodland has location advantages in Maopai Township,garden land has location advantages in Qingni Town,water area has location advantages in Wenchang Street,and construction land advantages are mainly concentrated in the central urban area.(2)During the study period,the total value of ecosystem services in Linchuan District decreased from 555,475,560,000 yuan in 2005 to 540,752,000 yuan in 2015,and a total decrease of 147,704,000 yuan in 10 years,of which the value of forest land and water area decreased the most.The contribution value of different ecosystem services is different.The contribution value of hydrological regulation function is the most,the contribution value of water resources supply is the least,and the contribution value of ecosystem services function fluctuates slightly at different time points.In Linchuan District,the distribution of the average value of land ecological services is very similar at all time points,which is generally in a spatial pattern of "low in the middle,high around".The I index of ecosystem service value at three time points in Linchuan District is relatively high,showing a pattern of spatial aggregation and distribution,and the spatial autocorrelation tends to increase.The overall spatial distribution characteristics of ecosystem services hot spots in Linchuan District are "two zones and one piece",and there are also distributions at the junction of towns and townships.The cold spots of ecosystem services value in Linchuan District are mainly concentrated in urban land and rural residential areas where human activities are intensive.(3)Through the analysis of the relationship between land use and ecosystem services,the degree of land use and all ecosystem services are negatively correlated,and the impact on supply services and support services is enhanced,while the impact on support services and cultural services is weakened.There is a significant negative correlation between the degree of land use and the concentration of land use,and the correlation is increasing.There was a significant positive correlation between each element of ecosystem services.(4)Through the analysis of the coordination degree of land use and ecosystem services,the overall land ecological coordination of Linchuan District is getting worse and worse: from 2005 to 2010,most of the townships are in a highly coordinated level of land ecology,while land use changes,the value of ecosystem services is constantly increasing,and the speed of land use change is faster than that of ecosystem services;The land ecological coordination of almost all towns in Linchuan District is at different levels of conflict,indicating that the value of ecological services has decreased during the study period.(5)The land use optimization strategy based on the improvement of ecosystem service function was put forward.Firstly,we should adjust the industrial structure according to the location advantages;secondly,we should practise intensive economy to protect resources and environment;thirdly,we should implement the system and improve the ecological compensation mechanism. |
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