EFFECT OF ARBASCULAR MYCORRHIZA FUNGI (Glomus Mosseae, Glomus Versiformea, Gigaspora Margarita and Gigaspora Rosea) ON PHOSPHATASE ACTIVITIES AND SOIL ORGANIC PHOSPHATE CONTENT IN CLOVER RHIZOSPHERE

• 不同AM菌根菌分泌的磷酸酶对根际土壤有机磷的影响