关键词: 坡耕地, 坡耕地, 秸秆覆盖, 马铃薯, 培肥效应

Abstract: In this paper, the Lactobacillus casei from Tibetan Kefir was used to screen for improving the environment factors of the yield of exopolysaccharide(EPS). The four factors affecting synthesize of exopolysaccharide of the fermentation conditions were determined by the four factors and three levels orthogonal experiments [L9(3)4]. The result was as follows: fermentation temperature—37℃, fermentation time—12h, origin pH of culture medium—6.5, amount of inoculation—5%. With the optimization conditions，the yield of exopolysaccharide was increased 1.39 times.