Abstract:

Three different land-use types, primary vegetation(PV)、artificial grassland(AG), degraded vegetation (DV) in alpine region of Tibetan Plateau. In the paper, soil bulk density, soil moisture content, Soil pH, Soil porosity, Soil organic nitrogen, total nitrogen, soil organic carbon, nitrify nitrogen, ammonium nitrogen contents of the 0-10, 10-20 cm soil layers were investigated. It is suggested that: The content of soil organic nitrogen and total nitrogen in the 0-20 cm soil layer varied in the order of PV(2.6495、1.5905 g/kg) >DV (2.5490、1.5700 g/kg)> AG (2.34、1.5015 g/kg) ; the content of soil total carbon and organic carbon in the 0-20cm soil layer varied in the order of PV> (15.6355、14.37 g/kg)> DV (13.609、11.359 g/kg)> >AG (10.876、10.810 g/kg). The ratio of C/N in the 0-20 cm soil layer varied in the order of PV (5.90)>DV (5.10)>AG (4.65). The PV community had the best ability to maintain the soil organic matter. To maintain the stability of primary vegetation community, that was important for replacement, recovery and reconstruction of soil in alpine region of Tibetan Plateau.