Ecotoxicity of Coal Gangue Leaching Filtrate on Wheat Seed and Seedlings

Using wheat variety Changmai 6135 provided by Shanxi academy of agricultural sciences as material,simulating rainfall by columnar leaching equipment,the effects of coal gangue pile on plant growth,the ecotoxicity of coal gangue leaching to seed germination and seedling growth of wheat were assessed by indoor culture methods.The results showed that coal gangue leaching filtrate could inhibit wheat seed germination in some extent,and there was a positive correlation between the inhibitory effect and the concentration.When the concentration of coal gangue leaching filtrate was highest（7208mg/L）,the germination potential(656%)and germination rate(690%)of treatment group were the lowest.Wheat seedling weight in the group treated with leaching filtrate(4515~7208mg/L)was significantly lower than in the control group;The length of shoot and seedling height were also repressed significantly by leaching filtrate(3245~7208mg/L);There was a significant linear negative correlation between chlorophyll content and the concentration of coal gangue leaching filtrate(R>085).There was a significant difference in wheat seedling POD activities of the groups treated with coal gangue leaching filtrate at different concentrations,and an extremely significant difference in SOD and CAT respectively.Besides, the difference of POD and SOD of different parts was extremely significant,as well as POD and CAT of different time.In short,coal gangue leaching filtrate had a certain ecological toxicity effect on wheat seed germination and seedling growth.