Spatio-temporal Evolution of Vegetation Coverage and Response of Topographic Factors in Tangshan City
Fractional vegetation cover plays an important role in ecological environment quality assessment,surface process monitoring and ecological protection decision-making.Based on the GEE platform,the vegetation coverage of Tangshan City in different periods was obtained by using the pixel dichotomy method.Sen trend analysis and MK test were used to explore the spatial and temporal evolution of vegetation coverage.The relationship between vegetation coverage and topographic factors was studied by GIS overlay analysis.The results show that:(1)The vegetation coverage of Tangshan City is stable.The vegetation coverage in the urban construction area and the southern coastal area is low.The vegetation coverage in the central and northern low mountainous areas is high,and the proportion of medium grade and above is more than 65%.(2)From 2001 to 2021,the vegetation coverage of Tangshan City was slightly improved,and the improved area reached 39.041%.(3)Vegetation coverage is significantly correlated with elevation and slope,especially in the range of elevation above 200 meters and slope 15 °～32 °,the vegetation coverage of middle and high grade and high grade is higher.Exploring the evolution of vegetation coverage provides strong support for the improvement of the ecological environment in the region.
万方数据
维普
