Experimental Study On The Optimum Proportion Of The Waste Land In The Northern Part Of Jiaozuo City

In this paper,The Taihang Mountains in north typical vegetation restoration in abandoned mines as the starting point,The selection of representative plants of tall fescue as tested plants,The ratio of soil matrix orthogonal experiment and pot experiment,the effects of different ratio of green matrix of water and fertilizer characteristics and tall fescue physiological characteristics,to reveal the mechanism about characteristics of substrates on the physiological characteristics of tall fescue,on this basis to determine the optimal matrix ratio,providing technical support for the vegetation restoration of rock slope of Taihang Mountain Area in north of Henan Province.The results of the study are as follows:(1)Through the analysis of the physical and chemical properties of the matrix,Compared with the control,the green substrate has the characteristics of strong water holding capacity and good ventilation performance,It is beneficial to the upper and lower migration of water,gas and fertilizer,and the growth and development of plant roots;Adding activated sludge can effectively increase the moisture content,conductivity of the substrate and the content of various nutrients,reduce the pH value of the substrate;Adding fly ash and slag can increase the pH value and porosity of the matrix;Adding straw can improve the bulk density and porosity of the substrate;After planting the pH,electrical conductivity,organic matter and ammonium nitrogen content of each ratio matrix decreased with the passage of time,and finally reached the stable state.(2)From the results of infiltration and evaporation test,The ratio of activated sludge is the key factor that influences the infiltration and evaporation of the matrix;The impact strength of each factor to the infiltration characteristics of the matrix is:activated sludge and fly ash,water retaining agent,soil and slag,straw,urea;The impact strength of each factor to the evaporation characteristics of the matrix is: activated sludge and fly ash,water retaining agent,urea,soil and slag,straw.(3)Microstructure analysis of soil matrix with different ratio,The green matrix containing activated sludge and slag is larger,and has good permeability,can form alarger structure,but also a more stable structure of the new aggregate;Add more fly ash and soil to the greening of the matrix particles accumulation of close,small pores,poor permeability;While the control of soil particles in loess accumulation closely,is a single particle size,not found in the aggregate structure.It shows that the different ratio of the matrix materials can improve the microstructure of the green matrix.(4)Study on the growth status of plants with different ratio of soil matrix,The rate of emergence was influenced by the activated sludge,and the excess activated sludge had a inhibitory effect on the rate of emergence,The impact strength of each factor to seedling emergence rate is: activated sludge and fly ash,straw,soil and slag,urea,water retaining agent;The impact strength of each factor to plant height is:activated sludge and fly ash,urea,straw,water retaining agent,soil and slag.(5)Using the orthogonal test range analysis and the queuing scoring method,the optimal ratio of matrix: water retaining agent(3~15g),sludge and fly ash(150:600~300:450),soil and slag(300:450~600:150),urea(0g),straw(30g).