Abstract: The species diversity of butterfly in Jiufeng Mountain of Baotou was examined based on the investigation in five transect lines: (Ⅰ) Zaogou Toll gate, (Ⅱ) Nangou Gate, (Ⅲ) Lingying Temple, (Ⅳ) Zaogou Road 33 km, (Ⅴ) Jiufeng scenic area. For all the individuals of butterfly  collected, there were 37 species belonging to four families and 34 genera. Among them, Neolycaena davidiand Erynnis popoviana were first recorded in Inner Mongolia. In terms of the richness of genera and species, Nymphalidae was the dominant family, with the highest genus richness (16) and species richness (19). Hesperiidae was the rare family, with the lowest genus richness (4) and species richness (4). Nymphalidae had the highest diversity index (4.8803) and evenness index (0.8517) and Pieridae had the highest dominance index (0.8784), while Pieridae had the lowest diversity index (1.0544) and evenness index (0.2942). Among different transect lines, Lingying Temple (Ⅲ) had the highest indices of family diversity (1.1052), genus diversity (2.2656) and species diversity (2.2951). With the seasonal change, speciesnumber (25), diversity index (2.3476) and species richness (4.0297) peaked in July. Among the 37 species, 27 were Palearctic species, accounting for 72.97% of the total species; 10 were widely distributed species, responsible for 27.03% of the total species and none was Oriental species, suggesting that the butterfly fauna was mainly Palearctic in the area.

Key words: microalgae harvesting., biological wastewater treatment, biomass energy, organic pollutant, microalgae