Response Of Planting Structure Succession To Temporal And Spatial Evolution Of Coal Mining Collapse In Suixi County

Coal mining subsidence occurs all over the country in recent years,causing damage to local ecological environment,social economy and agricultural planting.In this paper,by analyzing the temporal and spatial changes of Suixi County’s coal mining subsidence area and the changing trend of planting structure,the stress response relationship of the change of planting structure in Suixi County to the coal mining subsidence area is explored.First,arcgis software was used to analyze the spatio-temporal evolution of the coal mining subsidence area in Suixi County,to explore the spatio-temporal evolution characteristics of the coal mining subsidence area.Secondly,the change process and characteristics of land use type,yield,output value and sown area of each crop in Suixi County from 2000 to 2020 are analyzed.Finally,the response process and correlation of agricultural land and various crops in Suixi County to coal mining subsidence are calculated respectively,and the conclusions are drawn as follows:(1)The number and area of Suixi County’s coal mining subsidence area have been increasing year by year.The backfilling of Suixi County’s coal mining subsidence area is still insufficient,so it is difficult to curb the expansion of the coal mining subsidence area.Up to now,there is still a risk of further expansion of the coal mining subsidence area.In terms of the overall scale,Suixi County coal mining subsidence area is mainly concentrated in the northeast and southwest.The northeast coal mining subsidence area has basically stabilized,and the outward expansion trend of suixi County has decreased significantly in recent years.Southwest of Suixi County is the main area of suixi coal mining subsidence in recent years,which will continue to expand in the next few years.(2)The change of reservoir pit area can best reflect the change of the coal mining subsidence area in Suixi County.The reservoir pit area increased continuously from2000 to 2015 and decreased in 2020,which can be considered as the reservoir pit area increased correspondingly with the increase of the subsidence area.The two change trends are not identical because the coal mining subsidence area is larger than the reservoir pit.Therefore,the change trends of the two are not completely the same.Taking the change of reservoir pit area as the observation point,it is found that the time of reservoir pit in many towns in Suixi County is roughly consistent with the time of coal mining subsidence area.(3)The seeding area,yield and output value of Suixi County maintained an increasing trend year by year;Cash crops,by contrast,have seen their acreage and yields decline.Agricultural cultivation is more in favor of wheat and corn,other types of crops are decreasing year by year,and crop diversity is decreasing.(4)More and more towns are affected by coal mining subsidence,and more and more agricultural land is occupied by coal mining subsidence.The spatial direction changes of coal mining subsidence and agricultural land are basically the same,both in the northwest-southeast direction,showing a counterclockwise direction(direction Angle becomes smaller).(5)The 13 townships in Suixi County were divided into three categories:non-subsidence township,mildly subsidence township and severely subsidence township.The response degree of agricultural land in Suixi County to coal mining subsidence stress during 2005-2010,2010-2015 and 2015-2020 was calculated.It was known that the response degree of severely subsidence township was significantly higher than that of mildly subsidence township.The distribution of towns with severe subsidence is in the direction of northeast to southwest,which coincides with the direction of coal mining subsidence.(6)The response of sown area of various crops to coal mining subsidence was calculated respectively.It was known that cotton was the crop most affected by coal mining subsidence,and its response reached the maximum in 2015-2020.