Growth effect of Lespedeza bicolor Turcz. after the quarry slag substrate improved
YAN Yechen1,2, ZHANG Yan1,2, ZHAO Tingning1,2, WU Hailong1
1. Key Laboratory of State Forestry Administration on Soil and Water Conservation(Beijing Forest University), 100083, Beijing, China; 2. School of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing, China
Abstract：[Background] With the development of the social economy and the improvement of industrialization, people's demand and development degrees for natural mineral resources have been becoming higher and higher. However, mining has caused severe damage to the landscape and natural ecosystems. In addition, a large amount of solid waste such as biological feces, reed rods, garden waste cause secondary pollution for the environment, thereby affecting the normal life of human beings. How to reduce the cost of ecological restoration of abandoned mines, and scientifically and rationally dispose of these solid wastes are two issues to be solved urgently.[Methods] The slag mixed with cow dung, reed rods and garden waste according to different mass ratio was made into green substrate, and the Lespedeza with salt, alkali and barren resistance was used as experimental object, focusing on the characteristics of pH, organic matter, nitrogen, phosphorus, potassium and seedling rate under the effect of green substrate. The key factors affecting the water-holding of the substrate and plant growth were explored, and the optimal substrate ratio was determined through comprehensive analysis. Data were analyzed according to ANOVA by SPSS statistical software, and the significant differences among means were identified by LSD's multiple range tests at a significance level of P<0.05,and all data were presented as mean±SE.[Results] 1) The improved substrate significantly increased seedling rate, growth height, soil organic matter, total nitrogen (TN), total phosphorus (TP), total kalium (TK) and other contents, and significantly reduced soil pH value. 2) The different treatment methods had different effects on each indicator. The contents of soil organic matter, TN, TP, TK, etc. significantly increased in the S8 group compared with other groups. 3) Under the improved substrate, soil physical properties increased water-holding capacity and porosity and decreased bulk density.[Conculsions] The optimal substrate formula suitable for the growth of Lespedeza is selected ratio of reed rod to garden waste as 150:40. Through data analysis and comparison, the improved substrate could neutralize soil alkalinity,improve soil fertility, and improve soil water permeability and ventilation capacity. The study may provide theoretical support for mine ecological restoration and reconstruction, thereby improving the ecological and economic benefits of the mining area by determining the optimal substrate ratio.
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2020, Vol. 18 
