关键词: 土地利用类型, 降雨径流, 面源污染, 赣江下游

Abstract:

To analyze the agricultural non-point pollution characteristics under different land-use types in estuary area of Ganjiang River, the typical agricultural lands (forest land, vegetable land, paddy land) are selected and the nitrogen and phosphorus distribution characteristics of the runoff are analyzed. The analysis results show that the surface runoffs from different land-use type in estuary area of Ganjiang River are different, following a downward order of forest land, vegetable land and paddy land, so the land-use type is the main influential factor on runoff yield; the nitrogen and phosphorus content in runoff is higher in the initial period of precipitation, which rises sharply in a short time and then decrease, and the initial scouring effect is obvious; the nitrogen and phosphorus content in the runoff from vegetable land is the highest, followed by paddy land and forest land. The research result can provide important theoretical basis for preventing the nitrogen and phosphorus loss in rainfall runoff under different land-use types in estuary area of Ganjiang River.

Key words: land-use type, rainfall runoff, non-point pollution, estuary area of Ganjiang River