关键词: 高寒草甸, 土地利用, 土壤有机质, 土壤全氮含量, 土壤全磷含量

Abstract: The soil nutrient elements contents and vertical distributions are intensively influenced by the land use changes. According to the comparative research of the soil organic matter contents,total nitrogen and total phosphor in the different land use patterns,such as naturally-enclosed vegetation,grazing and cultivation,and in the different soil depths including 0-10cm,10-20cm and 20-40cm. There were significant difference between the different soil depths and soil nutrient elements. The soil nutrient elements had a negative linear correlation with the soil depths (R2>0.40,P<0.05) in the naturally-enclosed vegetation. The soil nutrient elements weren't significantly affected by grazing and cultivation (mean value of P above 0.05). In the land use pattern of the grazing,the contents of the soil organic matter and total nitrogen had a negative linear relationship with the soil depths,while it had not a linear relationship in the land use pattern of the cultivation. The organic matter contents and total nitrogen in the soil surface layer decreased,while the total phosphor significantly increased in the land use pattern of the grazing and cultivation (mean value of P below 0.05),but it was not change in the deep soil layer. Moreover,the influence of the cultivation on the soil nutrient elements was greater than that of the grazing,but not significantly.

Key words: Alpine meadow, Alpine meadow, Land use, Soil organic matter, Total nitrogen, Total phosphor