Abstract: A typical area of habitat fragmentation in the Thousand-Island Lake,Zhejiang Province,was selected as subject to study effects of habitat variation as a result of island forming,on arbuscular mycorrhizae infection rate and its correlation with phosphatase activity in the rhizosphere of Castanopsis sclerophylla.Results show that with habitat acreage as the factor in one-way variance analysis(ANOVA) AM infection rate was not significantly different between islands,while in Pearson′s correlation analysis,infection rate was significantly negatively correlated with acreage of an islands.Acid phosphatase activity in the rhizosphere of Castanopsis sclerophylla varied sharply with the size of an island,but was not significantly related to AM infection rate.

Key words: islanding, Castanopsis sclerophylla, arbuscular mycorrhizae, infection rate, phosphatase activity