| Coal production is accompanied by the production of a large number of mine water,and the water inflow of different mining areas in China is increasing every year.The traditional physicochemical treatment process of mine water has the advantages of large investment,large land occupation and complex process,and the treated wastewater is difficult to meet the discharge standard,so it can only be used as industrial water,resulting in the waste of water resources.Therefore,taking mine water as irrigation water in coal mining area is of great significance for landscape restoration and environmental ecosystem improvement.The pH value of mine water in Fushun mining area is 6.76,and the contents of K,CA,Mg and Na are 73.2,110.5,75.3 and 42.5mg/l respectively,which are the nutrient elements for plant growth and development.The content of heavy metal elements which are harmful to plant growth is very low,which indicates the necessity and feasibility of mine water in Fushun mining area as irrigation water for mine landscape restoration The optimal proportion of mixed irrigation for cold season turfgrass was studied.In this paper,ryegrass and Medicago sativa were used as the cultivation objects.Clear water and mine water were used as irrigation water.Different mixed irrigation ratios of clear water and mine water(clear water group,mixed irrigation ratio of 2:1,1:2,1:1,mine water group)and quartz sand were used as the culture medium.Through the soilless cultivation method,the characteristics of ryegrass and Medicago sativa were explored According to the change trend and mechanism of biomass,physiological characteristics and photosynthetic effect under different irrigation methods,the characteristics and optimal irrigation proportion of cold season turfgrass irrigated by mine water were obtained.When the ratio of clear water and mine water was 2:1,the biomass,physiological characteristics and photosynthetic effect of the two grass species were promoted the most,while the inhibition of mine water was the strongest.In this paper,through the cultivation method of potted soil culture,the biomass,physiological characteristics,photosynthetic effect and soil environmental safety effect of ryegrass and alfalfa under different irrigation methods were studied by using different mixed irrigation ratios of clear water and mine water(CK clear water group,mixed irrigation ratio 2:1,mixed irrigation ratio 1:1,mine water group).When the ratio of clear water and mine water was 2:1,the biomass,physiological characteristics and photosynthetic effect of the two plants were promoted the most,and the inhibition effect of mine water was the strongest.With the increase of the proportion of mine water irrigation,the soil nutrients,soil p H and total salt content of each soil sample also increased.The contents of K+,Na+,Ca2+and Mg2+in the clean water control group were the lowest,and the contents gradually increased with the increase of the proportion of mine water irrigation in each group.In this study,the growth,physiological and photosynthetic characteristics of two cold season turfgrass and the physical and chemical properties of plant rhizosphere soil under different mixed irrigation ratio of mine water and clean water were studied by soilless cultivation and pot soil culture.The feasibility and optimal mixed irrigation ratio of mine water as irrigation water were obtained,which was beneficial to solve the problems of mine water treatment and discharge and Landscape Utilization in the process of mine restoration Lack of water.So as to realize the green development of mining area and the construction of circular and economical production mode. |
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