| The statistical analysis of geographical national factors is an essential step in the work of geagraphical nation conditions.Due to the large amount of data generated during the census of geographical national conditions,statistical analysis is the value of in-depth data mining census data,and analysis of the characteristics of national conditions and development trends.The actual application of geographical national conditions results in the integration of geographical national conditions and society,and achieves the initial intention of the geographical national conditions.In the past,remote-sensing images were used as analysis data and geographical national data were used to analyze basic data,that is showing the progress of the geographic information and surveying industry.Jinzhai County is a famous old revolutionary area in China,and it is also an important water conservation area and key land reform county in Anhui province.Based on the results of the 2015-2017 high score images and national conditions data-bases and other achievements and socio-economic data,it used GIS spatial analysis,landscape patterns,transfer matrix,mathematical modeling and other comprehensive methods to extract national data and analyze its basic characteristics,spatial patterns and correlation analysis by the software such as ERDAS,Arc GIS,Fragstats,and Excel.Based on the town land use in Jinzhai County,constructed a town land's ecological risk assessment model is to directly reflect the current situation and risk assessment results of town land use.Then it is analyze the ecological status of town land in Jinzhai County from different aspects and propose constructive suggestions.The main results are as follows:(1)About the basic characteristics,spatial pattern and correlation analysis of the six topics that is land cover,road traffic,forest and grass cover,river basin,landform in Jinzhai County,the statistical analysis results are as follows:1In 2017,the results of surface coverage in Jinzhai County were divided into eight categories: planted land,forest and grass cover,housing construction,railways and roads,artificial excavation sites,deserts and bare ground,structures,waters,besides,thire respective proportions is 18.32%,74.70%,1.55%,0.82%,0.46%,0.36%,0.54%,and 3.32%.Between 2015 and 2017,the transition area of land cover was 37.8415 km2,and the area of planted land has changed the most;2In Jinzhai County,the length of the highway is 1141.3955 km,the length of the city road is 157.2953 km,and the length of the country road is 4310.7170 km.The distribution of roads has a strong correlation with town land use,and its correlation coefficient is 0.9022,showing a significant correlation.3Town land is mainly composed of house buildings and structures,accounting for 74% and 26% respectively.From the perspective of landscape pattern,it can be seen that the number of patches and patch density index showed an upward trend from 2015 to 2017.Also because the degree of landscape fragmentation increased,and the degree of clustering of the same type of landscape decreased,and the level of human disturbance was not obvious,so the overall state of Jinzhai County is good.(4)The forest and grass cover factors in Jinzhai County are mainly divided into broad-leaved forests,coniferous forests,coniferous-broad-leaved mixed forests,broad-leaved shrub forests,mixed forests of canopy irrigation,bamboo forests,green forest land,artificial young forests,high-coverage grasslands,green grasslands,slope protection grassland.And the respective proportions were 44.635%,29.526%,9.676%,1.392%,0.143%,8.135%,0.005%,0.143%,6.335%,0.005%,and 0.005%.(5)The river basin is mainly represented by linear and planar elements.In addition,the river network density in Jinzhai County is 0-15.7505km/km2.(2)The ecological risk assessment range of urban land in Jinzhai County is 0.1807-0.6671 by the calculated model.According to the risk level classification,the town land area and proportion of each grade are the extremely high ecological risk 0/0,the high ecological risk 515241.34 m2/0.63%,the middle ecological risk 41705468.67 m2/50.80%,the low ecological risk 39764198.32m2/48.44%,the extremely low ecological risk 107762.548 m2/0.13%.Analyzing the ecological rise of town land from the perspective of township and space,we can see that the ecological risk of town land in 23 townships in Jinzhai County is high ecological risk in the central area,and the middle ecological risk is spread to the periphery,and the low ecological risk is the outermost.For this distribution pattern. |
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