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Acta Prataculturae Sinica ›› 2009, Vol. 18 ›› Issue (3): 6-11.

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Effects of different disturbances on species diversity and biomass of community in the typical steppe

Hugejiletu, YANG Jie, Baoyintaogetao, BAO Qing-hai   

  1. College of Life Science, Inner Mongolia University, Huhhot 010021, China
  • Received:2008-11-18 Online:2009-06-20 Published:2009-06-20

Abstract:

Abstract: Effect of different disturbances on species diversity, community height, community density, aboveground biomass of the typical steppe was investigated by quadrant method. Four treatment plots were devised in the study area, including moderately grazed (G), mowing once a year (M), exclosure for 7 year (E7) and exclosure for 27 year (E27) plots. The richness index, diversity index and evenness index in the E27 and G were significantly higher than those in the E7 and M, but there is no significantly difference between E27 and G. So, E27 and G might maintain community species diversity. The important values of the indicator plant of degradation (Cleistogenes squarrosa) in M and G plots were significantly higher than that of the exclosure plots. The above ground biomass of E7 was 454.06 g/m2,and significantly higher than that of the other plots. Thus, E7 could significantly increase the steppe productivity, but there would be no help for the steppe productivity if exclosure lasts too long.

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