[Micro-community characteristics of vegetations in blowouts and depositional areas of Hulunbuir grassland, Inner Mongolia].

By using traditional sampling methods,the micro-communities of vegetations in fixed,semi-bare,and bare blowouts of Hulunbuir grassland were investigated,and the investigation data were statistical analyzed.The results showed that the vegetation coverage decreased in the order of fixed blowout,semi-bare blowout,and bare blowout,and was lower than that of the primary vegetation Form.Stipa grandis.Potentilla acaulis and Kengia squarrosa were the dominant species in fixed blowout,with the coverage being 5%;while P.acaulis and Carex sp.were the dominant species in semi-bare blowout,with the coverage being 2%.The dominant species in depositional areas of semi-bare blowout were P.acaulis,K.squarrosa,Agropyron cristatum,and Thymus mongolicus,and the coverage was 4%.The dominant species on the southwest slope of bare blowout was Agriophyllum pungens.The middle depositional area of bare blowout was also occupied by A.pungens(coverage 4.7%),and the edge of it was dominated by A.cristatum(coverage 2.7%),Carex sp.(coverage 2.6%),and T.mongolicus(coverage 1.7%) from the edge of the depositional area to primary grassland.The mean species importance value in fixed,semi-bare,and bare blowouts was 12.64%,13.38%,and 20.08%,while that in the depositional area of semi-bare blowout and in the middle and edge of bare blowout was 12.55%,40.18%,and 11.15%,respectively.