ESJ58 一般講演（ポスタ-発表） P2-350
*Li Min,Kenji Tamura（Grad.Sch.Life.Environ.Sci.,Univ.Tsukuba,Japan）,Wuyunna（Colg.Life Sci.,Dalian Nation.Univ.China）Teruo Higashi（Grad.Sch.Life.Environ.Sci.,Univ.Tsukuba,Japan）
In Inner Mongolia, over-grazing and over-cultivation affect the grassland ecosystem, finally lead to the desertification. The objective of this study is to describe the distribution patterns of vegetation and clarificate the soil physico-chemical properties in different intensity grazing lands.
For analyzing the organic carbon (OC) and TN, 0.5mm soil samples about 150mg were taken and analyzed by NC-900. Took a 2×2 m2 in sampling sites, divided the square to 25×25 cm2) squares, and recorded the coordinates of dominant species in each square. Then described the distribution patterns by Surfer 8.
The contents of OC in soil samples were 1.78%-2.00%(H), 0.87-1.17(M), and 2.04%-2.44%(L); the contents of TN are 0.15%-0.23%(H), 0.10%-0.13%(M), and 0.21%-0.34%(L). In L, the OC and TN are lower than the other two sampling sites, because of few grazing activity. The value of pH are 6.02-7.05(H), 6.15-6.50(M), and 6.42-7.09(L). The species number in sampling sites are 9(H), 14(M), and 13(L), under moderate grazing intensity, the species, the contents of OC and TN is the most, According to the Intermediate Disturbance Hypothesis, it’s reasonable, and the biodiversity will keep balance.