中文摘要：

结合实地考察样点处蝗虫密度情况，研究了白石头蝗区海拔、植被、土壤理化性质与蝗虫数量之间的关系．结果表明，在海拔2000m～2400m之间，随着海拔的升高，蝗虫密度减少．蝗虫主要分布在山地荒漠草原和山地草原带，最适宜的栖息场所为植被覆盖度介于35％-55％之间、土壤呈碱性（pH平均值为8．40）的环境．土壤含盐量范围为0．05％-0．60％，不会对蝗虫的活动产生影响．土壤有机质直接影响到地上植被的长势，从而影响蝗虫的生存．

英文摘要：

Relationships between grasshopper occurrence and altitude, vegetation, soil pH value, soil salinity and soil organic matter are analyzed in the grasshopper plague area at Baishitou and the differences between different grasshopper density regions compared to sampling points at this site. The results indicate that with the altitude＇s increasing from 2000 m to 2400 m, the grasshopper densities reduce. Grasshoppers are mainly distributed in mountain desert and grasslands where the vegetation coverage is between 35 % and 55 %. Alkaline conditions also help to the survival of grasshopper. Salinity in a certain range has no obvious effects on the grasshopper density. Soil organic matter directly affects the growth of ground vegetation, thus affecting the survival of grasshoppers.