Study On The Influence Of Landscape Pattern On Land Surface Temperature In Villages And Towns

Landscape pattern is one of the important factors affecting the thermal environment of villages and towns.The correlation between vegetation landscape pattern and village and town ground temperature in plain area can provide theoretical support for optimizing the regional human settlement thermal environment.Based on landscape ecology theory,remote sensing image information technology and GIS technology,10 villages and villages were randomly selected to obtain the corresponding landscape pattern index.The ground temperature inversion method of remote sensing image was used to obtain the surface temperature,explore the relationship between the village and town landscape pattern index and the land surface temperature,and analyze the correlation between the change of landscape pattern index and the land surface temperature under different vegetation cover conditions.From the above study,the following main conclusions are drawn:1)There is a correlation between multiple land-use types and ground temperature.Taking villages and towns in Pinghu District as an example,the correlation order from largest to smallest is:construction land > forest land > arable land,shrub land > water body.Among them,when the proportion of construction land area is greater than 50%,it has a significant warming effect,and when the area proportion of forest land is greater than 77.8% of the unit area,it has a certain cooling intensity and can play a cooling effect,while the cooling effect of cultivated land,shrub grassland and water body land type is limited.2)Under the condition of different proportion of green space,the influence of landscape pattern index on ground temperature is different.When the percentage of green area is less than 40%,the maximum patch area index(LPI)can reduce the ground temperature by about 1°C for every 10 decrease.For every increase in diversity index(SHDI),the ground temperature decreases by 5～6℃ When the proportion of green space is 40%～60%,the ground temperature decreases by about 1℃for every 20 increase in the sprawl index(CONTAG).3)Under different temperature zone grades,the correlation between the landscape pattern index and its corresponding geothermal temperature is different.Among the five temperature grades,the mean ground temperature in the low temperature zone was highly correlated with the landscape pattern index,negatively correlated with the average patch area(AREA＿MN),maximum patch area index(LPI),aggregation index(AI),and positive correlation with edge density(ED)and spread index(CONTAG).4)At village scale,the spatial characteristics of land use type are consistent with the distribution law of ground temperature.The above research conclusions can provide a basis for further optimizing the thermal environment,improving the scientific greening level,and guiding the planning and design of livable villages.