Analysis on the Spatial and Temporal Changes in Ecological Factors of Cultivated Land in Coal-Food Composite Area

Abstract

In recent years, the study about the ecological situation of cultivated land is lacking in the coal-food composite area. Based on the collection of field soil samples and laboratory analysis. A study was carried out to the spatio-temporal changes of ecological factors in cultivated land during mining subsidence in the coal-food composite area in Zhaogu No. 2 Coal Mining Field in Xinxiang City, Henan province, China, by means of remote sensing (RS) and geographic information system (GIS) technology. The results indicate: 1) the spatial distribution of ecological factors in farmland was closely related to coal mining activities during research period. The significant regional changes were mainly concentrated in coal mining dynamic subsidence areas .2) the overall pattern of ecological obstacles of farmland displayed a declining pattern, with a weakly gravity center migration during the study period. However, the changes of ecological driving factors in arable land were opposite.3) in the cross section of mining subsidence, the slope of ecological equation for the ecological barrier factor displays a small difference. The rate of the ecological driving factor increased significantly with the slope of the factor fitting equation increased. And in the mining longitudinal section, the mean value of the ecological barrier factor decreased. The average value of the ecological driving factor of the cultivated land was increased, and the fitting equation was significantly changed. Affected by the coal mining time, the spatio-temporal variation of the ecological barrier factor of the cultivated land is less than the ecological driving factor.