The activities of extracellular enzymes in sediment in the east end of chongming island changed regularly along the elevation gradient , the physical and chemical factors affected the activities of extracellular enzymes 崇明东滩沉积物中胞外酶活性沿高程梯度或演替系列呈规律性变化,沉积物理化性质影响着胞外酶活性的分布。