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草业学报 ›› 2009, Vol. 18 ›› Issue (3): 6-11.

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不同干扰对典型草原群落物种多样性和生物量的影响

呼格吉勒图,杨劼*,宝音陶格涛,包青海   

  1. 内蒙古大学生命科学学院 生态与环境科学系,内蒙古 呼和浩特 010021
  • 收稿日期:2008-11-18 出版日期:2009-06-20 发布日期:2009-06-20
  • 作者简介:呼格吉勒图(1980-),男,蒙古族,内蒙古赤峰人,在读博士。E-mail:qhgjlt_529@sina.com
  • 基金资助:

    国家重点基础研究发展规划“973”项目(2007CB106807)和国家自然科学基金项目(40841018)资助。

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

摘要:

采用样方法对内蒙古典型草原区围封27年(E27)、7年(E7)、1年割1次(M)和中度放牧(G)样地的群落物种多样性、群落高度、群落密度、地上生物量进行实地调查分析,以研究不同干扰对典型草原群落物种多样性和生物量的影响。结果表明,围封27年和中度放牧样地的丰富度指数、多样性指数、均匀度指数仍显著高于围封7年和1年割1次样地,但围封27年样地与中度放牧样地之间无显著差异,围封27年和中度放牧相对于围封7年和1年割1次可以维持群落物种多样性;1年割1次和中度放牧样地退化指示植物糙隐子草重要值显著高于围封样地,草原群落呈退化趋势;围封7年样地的地上现存量为454.06 g/m2,显著高于其他样地。说明围封7年可显著提高草原生产力,但围封时间过长将不利于其维持较高的生产力。

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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