FIELD OBSERVATIONS ON EFFECTS OF FLOOD FLOW ON SOIL AND RIVERINE VEGETATION ON FLOOD PLAIN IN A GRAVEL RIVER

Abstract

It has been known that the growth of the vegetation on flood plain is much affected by the transport of substances by flood flow. Field observations were performed at Tama-river during July in 1998 and August in 1999, in which water qualities of flood flow, contents of organic matter and nutrients in the soil on flood plain and distribution of riverine vegetation were measured. The results of the observations show that the riverine vegetation on the left side flood plain was removed by the flood flow, which yields the decrease of contents of phosphorus and organic matter in the soil.