Analysis And Evaluation Of Vegetation Restoration Benefits In Industrial And Mining Wasteland

Jixi is located in the east of Heilongjiang province.It has rich mineral resources.It is one of the most important old industrial bases in Northeast China.It is also the largest coal producing city in Heilongjiang province.Besides,it has a large number of mineral resources such as graphite and cement ore.Therefore,Jixi is also known as the capital of coal city and graphite.However,the mining and processing of a large number of mineral resources have caused serious damage to the local ecological environment.In order to protect and restore the ecological environment of the mining area,a great deal of research has been made in the areas of pioneer species selection,waste land matrix improvement and abandoned land afforestation technology on the premise of a large amount of research by the relevant researchers.Achievements,but lack of research on vegetation restoration benefit and evaluation under different vegetation restoration models.This paper is based on the model of the mixed forest of Pinus sylvestris Akamatsu,Akamatsu Jubayashi model,Akamatsu-Hippophae rhamnoides mixed forest model and the pure forest model of Hippophae rhamnoides in the cement and ore wasteland of Jixi city as the research object.The field plant investigation,soil sampling and experiment are carried out by the control of the same type of abandoned land which has not been restored by artificial vegetation.The physical and chemical properties of the soil and the water holding characteristics of litter were measured,and18 factors affecting the restoration of vegetation were screened out.Then 7 factors were selected,including the richness index,PH,total nitrogen,biomass of litter,available phosphorus,total potassium,total potassium,organic matter and soil soil saturated water content by using grey correlation analysis and correlation analysis.The evaluation system for the benefit of vegetation restoration is constructed.Through the analysis of the data of 7 selected indexes,the weight of each index in the evaluation system is calculated,and the evaluation criteria of each index are determined.The results are divided into 5 evaluation grades of good,good,general,poor and poor,and the ecological recovery benefit of industrial and mining wasteland under different vegetation patterns is evaluated by using fuzzy comprehensiveevaluation method.The evaluation result is that the fuzzy comprehensive evaluation of the pure forest of Hippophae rhamnoides is better,the mixed forest of Pinus sylvestris Akamatsu and Akamatsu Jubayashi are general,and the Akamatsu-Seabuckthorn mixed forest is poor,and the fuzzy comprehensive evaluation of the bare land is poor.