| China's coal demand is huge.The large-scale exploitation and processing of resources in coal mining area not only meets the needs of social and economic development,but also causes the rapid changes of land use and land cover forms.It brings such problems as the occupation of agricultural land by industrial and mining land,the serious surface subsidence of mining area,and the pollution caused by the occupation of coal gangue.At present,under the background of building socialist ecological civilization with Chinese characteristics in the new era,how to solve the contradiction between energy resource demand of economic and social development and agriculture and ecological environment protection is the primary problem faced by comprehensive management and sustainable development of coal mining areas.Reclamation of subsidence land in coal mine area is an important way to solve the above contradictions fundamentally,and it is also an important basis for ecological restoration and sustainable development of coal mine area.Based on the Nantun coal mining area in the northwest of Zoucheng City,Shandong Province,this paper analyzes the dynamic characteristics of land use change based on the land use data of the mining areas in 2004,2007,2012 and 2017.The change of subsidence land is studied emphatically,and the future change trend of land in mining area is predicted and quantified.Then,for the comprehensive management of the subsidence area of the mining area,the suitability evaluation of the reclamation land in the subsidence area was carried out,which provided data basis and decision support for comprehensive management of subsidence land in mining area.In the dynamic change of land use,it has been found that the problem of mining area subside has been serious in the past 13 years.It mainly comes from agricultural land and construction land,which continues to cause land squeeze.The final conclusions are as follows:(1)In the past 13 years,the area of agricultural land decreased the most and construction land increased the most.The area of subsidence land decreased significantly from 2004 to 2007 due to reclamation measures,but it was restored to the initial level of research by 2017.(2)From 2004 to 2017,the comprehensive dynamic degree of the mining area was stable between 2% and 5%.The rate of change of the unused land and the value of the newly added rate have been relatively large.The subsidence of the mining area and its treatment form a large area of undetermined use of theland.(3)The index of land use degree is in the range of 100-400,which means the mining area is in the development stage and with a slowly increasing trend.(4)From 2004 to 2017,land use transfer experienced a relatively strong to gentle stage.The area transfer mainly occurred between agricultural land,construction land and unused land.The reasons for the transfer were mostly related to the subsidence of mining area.The prediction of land use change and the analysis of subsided land in the mining area show that the area of construction land will increase significantly in the future,and the proportion will increase to 36.52% by 2030.The area of the subsided land will continue to occupy a high proportion.Based on the analysis of the results of 2004-2017,there are repeated changes in the area of subsidence land which mainly from agricultural land and construction land,therefore,it has a great impact on agriculture and residents' lives.As an important part of Jining subsidence,village relocation has been carried out in the mining area because the land squeezing,so it is necessary to reclaim the subsided land.Through the evaluation of the suitability of the subsidence area,it is found that the most suitable direction for reclamation in the mining area is garden reclamation.(1)Matter-element extension analysis shows that the most suitable direction for reclamation is garden reclamation.In the direction of suitable cultivation,the highest correlation value is 80% and the correlation value of high suitability is the largest which is-0.142(-1?-0.14?0),it is necessary to adjust the index to reclaim the subsided land;In the direction of suitable forest,the highest correlation value is 80% and the correlation value of high suitability is the largest which is 0.19(0?0.19?1);In the direction of suitable garden,the highest correlation value is 83% and the correlation value of high suitability is the largest which is 0.21(0?0.21?1);In the direction of suitable fishery,the highest correlation value is 60% and the correlation value of high suitability is the largest which is 0.05(0?0.05?1).(2)The results of grey correlation analysis showed that the most suitable direction for reclamation is garden reclamation,and the order of the magnitude of correlation degree was suitable garden(0.941)> suitable forest(0.929)> suitable fishery(0.881)> suitable cultivation(0.666).(3)Comparing the two evaluation methods,the final result shows that the two methods have good consistency.Matter element extension methoddetermines the reclamation suitability as suitable garden > suitable forest > suitable fishery > suitable cultivation based on the percentage of evaluation index ineach direction of suitability and the value of final correlation degree,which is consistent with the results of grey correlation analysis method,and the ultimate suitable reclamation direction is garden reclamation. |
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