Study On The Influence Of Vegetation Restoration Process On The Substrate In Industrial And Mining Wasteland

Jixi City is located in the eastern part of Heilongjiang Province and is an important coal base and graphite producing area in China.The region is rich in mineral resources and has greatly improved the local economy,but it also caused great damage to the ecological environment.A lot of industrial and mining waste.In this paper,the quarry abandoned land in the cement plant of Jixi City was taken as an example.Through on-site investigations,sampling,testing,analysis,and other methods,the physical and chemical properties of the substrate and the status of vegetation restoration in wasteland during the vegetation recovery period were studied.The effects of different types of vegetation restoration patterns on vegetation restoration status and the dynamic changes of substrates in mining areas provide theoretical basis and practical guidance for vegetation restoration and ecological reconstruction in abandoned mining areas in eastern mining areas of Heilongjiang Province.Research indicates:With the increase of recovery time,the pH of the substrate was improved from the alkaline before recovery to the neutral under the four types of vegetation restoration modes.The order of improvement was: Seabuckthorn forest > Pinus sylvestris and Red pine mixed forest> Pinus sylvestris Forest>Red pine forest.With the increase of recovery years,the natural moisture content,maximum moisture content,organic matter,total nitrogen,available nitrogen,total phosphorus,and fast-acting phosphorus content of the matrix were all generally increased under the four types of vegetation restoration patterns,and the increase of the matrix upper layer was significant.Among them,the improvement effect of the seabuckthorn forest restoration model on the organic matter and nitrogen in the matrix was better than that of the other three vegetation models.The improvement effect of the red pine forest restoration model on the matrix available-improved phosphorus was better than the other three vegetation models,and the four vegetation restoration models were effective for the matrix.Fast-acting potassium did not improve.With the increase of recovery years,the comprehensive fertility of the four typesof vegetation recovery modes were: seabuckthorn forest(16)>Pinus sylvestris forest(15)>red pine forest(14)>Pinus sylvestris and Red pinemixed forest(11).It can be seen that the recovery mode of seabuckthorn forest is more suitable for improving the matrix status of industrial and mining abandoned land in cement quarry.