Landecological Quality Evaluation And Diagnosis Of Obstacle Factors Of Yulin City

The frequent occurrence of land ecological problems is a major problem that restricts the long-term development of China's social economy.With the high speed of social and economic development in China,the extent of exploitation and utilization of all kinds of resources is becoming increasingly serious.People blindly demand economic benefits from land,which leads to a series of land ecological problems.Land desertification has been accelerated,soil erosion has become increasingly serious,grassland degradation has intensified,forest resources have been reduced,groundwater level has decreased,water pollution has increased,biodiversity has been reduced,and environmental pollution has gradually spread to rural areas.To solve the ecological problems of the land and protect ecological requires the assessment of the quality of the land.Know about land ecological quality evaluation of yulin city,the land ecological quality and obstacle factors,and put forward solutions,targeted for the prevention of yulin area land ecological environment deterioration,and land degradation is important.Based on remote sensing data,maps and statistical data,in line with the combination of theory and practice,the combination of qualitative and quantitative concept,Combinecloud model with the combination-weighting method to build the land ecological quality evaluation model;evaluatethe land ecological qualityof Yulin,Using the moran index to analyze the spatial distribution of the land ecological qualityof Yulin,and analyze the obstacle factors of the land ecological quality.The results show that:(1)In 2003,the distribution of land ecological quality of Yulin was generally high in the west and north,low in the middle and south;In 2014,the change of the land ecological quality grade are different in different areas,but higher than that in 2003 as a whole.(2)In 2003 and 2014,the land ecological quality of Yulin city showed positive spatial autocorrelation and decreased agglomeration degree.In 2003,the local spatial correlation type of land ecological quality in Yulin city was only "LL" type,which were distributed in the east and south of Yulin city.In 2014,the local spatial correlation types of land ecological quality in Yulin city included "HH" type and "LL" type,the county area which presents "HH" type is the Jingian county in the west of Yulin city,and the county area of "LL" type is the Jia county in the east of Yulin city.(3)In the rule layer,the main factors that affect the land ecological quality of Yulin during the study periodare mainly two levels: land ecological quality state and response,In 2014,the growth value of land ecological quality state obstacle and land ecological quality pressure obstacle is greater than 6.16,However,the land ecological quality response decreased significantly;From the index level,the main obstacle factors include soil erosion control rate,waste water treatment rate,energy conservation and environmental protection expenditureas GDP ratio,surface soil texture,etc;From the point of counties major obstacle factors change,land ecological types for high value agglomeration spatial agglomeration quality of shenmu county and surrounding counties of the main obstacle factors mainly including wastewater emissions per unit of area,sulfur dioxide emissions per unit of area,the rate of water loss and soil erosion control and energy saving,environmental protection,such as spending as a share of GDP;Land ecological quality spatial agglomeration types for low concentration of jingbian county and its surrounding counties main obstacle factors mainly include the effective irrigation area of cultivated land,applying fertilizer content per unit area,and the proportion of energy conservation and environmental protection spending as a share of GDP,etc.;The main obstacle factors in suide county,mizhi county,wubao county,qingjian county and zizhou county mainly include forest coverage,effective irrigated area ratio,and per capita water resources.