The impact of human disturbances including grazing

cultivation and anti-grazing(from 1987

1997

2003 respectively) on nutrients contents(N

P

K and organic matter) in typical grassland soil was studied in the paper.The result showed that cultivation and grazing can lead to a decrease in nutrient contents of soil

especially topsoil

and cultivation affects it more significantly than grazing;Banned-grazing can increase nutrients contents of soil

which increase with banned-grazing period.At the same time

there exist significant minuslinear dependency relationship between the total N

available N

organic matter and soil depth;there exist second power function relation between available P

available K and soil depth.The total P contents increases with the soil depth

and the total K decreases with it

but the dependency relations were not significant.It is concluded that anti-grazing can increase the nutrient contents in grassland soil and restrain the degradation of grassland soil.