Five runoff plots

which different land use patterns was built.Studying the influnces of various factors on nutrients losses.The result of the content of <0.01mm granule in 0~15 cm soil layer has observable correlation to the content of total K and Olsen-K in runoff mud and sand;The content of <0.01 mm and <0.001 mm micro aggregates in 0~15 cm soil layer has observable correlation to the content of organism

Olsen-K and total N;The degree of <0.01 mm granule reunite in the same layer has observable correlation to the content of total N and Olsen-K

and the degree of <0.001 mm granule reunite has observable correlation to the content of total P

Olsen-p and Olsen-K.