Abstract: Soil samples were collected from the periphery of gangue yard within the coal mining area in Maiping township of Huaxi District, Guiyang City to study
 the changes of soil algal composition, diversity, and biomass, and their correlations with soil factors. In un-contaminated soils, the observed algae consisted of five phyla and forty-three genera, with thirteen genera of Cyanophyta, seventeen genera of Chlorophyta, and seven genera of Bacillariophyta. After the contamination of coal gangue, the richness and individual density of soil algae decreased obviously. At seriously contaminated sites, Cyanophyta only had three genera, and Chlorophyta only had four genera. The Shannon index of soil algae had significant correlations with soil available Fe, Mn, and P, while the species richness had significant correlations with soil pH and available P. The chlorophyll content of soil algae at seriously contaminated sites was decreased by 93.1%, compared with that at un-contaminated sites. The algal biomass was significantly positively correlated with soil pH and negatively correlated with soil available Fe, suggesting that soil pH and available Fe were the important factors affecting the soil algal growth in the periphery of coal gangue yard.

Key words: Chilo suppressulis, Rice, Water oat, Oviposition, Host selection behavior