Effects of different disturbances on species diversity and biomass of community in the typical steppe
Effects of different disturbances on species diversity and biomass of community in the typical steppe
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发表时间：
2009
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通讯作者：
Hugejiletu;Y. Jie;Baoyintaogetao;Bao Qinghai
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作者：
Hugejiletu;Y. Jie;Baoyintaogetao;Bao Qinghai
用象限方法研究了不同干扰对典型草原物种多样性、群落高度、群落密度、地上生物量的影响。在研究区设置了中牧(G)、一年割一次(M)、封育7年(E7)和封育27年(E27)4个处理小区。E27和G的丰富度指数、多样性指数和均匀度指数显著高于E7和M，但E27和G的差异不显著。E_(27)和G可能维持群落物种多样性，M和G样地退化指示植物Cleistgenes squarrosa的重要值显著高于围栏样地，E7的地上生物量为454.06 g/m~2，显著高于其他样地，因此，E7能够显著提高草原生产力，但围栏时间过长对草原生产力没有帮助。
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.