LUO Genhua, RAO Menggang, WANG Shuai, CHEN Tingting

 (College of environmental science and engineering, Liaoning Technical University, Fuxin 123000, China)

Abstract: With pot experiment, effects of coal gangue on poor soil and the growth quality of pakchoi were investigated. The coal gangue was divided into five treatment, 0%(the control group), 13%, 26%, 40% and 53%. Results show that (1) the migration ability of Pb is relatively poor in the mixture media, moreover, the accumulation of pb has a positive correlation with its biomass; (2) the pakchoi’s germination percentage, root length, above ground height and biomass reach their best as the proportion of coal gangue being 26%, and the germination rate, above ground height and its dry weight increase by 23%, 23.05% and 20.62%, respectively. However, all indexes will decline if the concentration of coal gangue is higher than 40%; and (3) the food quality was evaluated with single factor pollution index. When the supplementation of coal gangue are 0%, 13% and 26%, respectively, the product pollution index are 0.69, 0.79 and 0.93, respectively, which belongs to clean level; While if the supplementation of coal gangue are 40% and 53%, respectively, the product pollution index are 1.12 and 1.38, respectively, and both of which are at the light pollution level. Coal gangue can improve the nutrients of plant during their growth process and then can be used as the modifier for poor soil. Therefore,   comprehensive utilization of coal gangue can improve the ecological environment in mining area.

Key words:coal gangue, mixture media, pakchoi, heavy metal; lead, migration rule

EARTH AND ENVIRONMENT Vol. 43, No.1, Tot No.303, 2015, Page 14-20