【摘要】 通过分析大量文献结合实例数据演示的方式,对重要值的计算和统计方法中存在的问题进行了分析,主要问题为:在重要值公式的构建中对几个相对值的选取随意性大;乔木层与灌草层常采用不同的重要值计算公式导致层间物种可比性差;群落中分层统计计算重要值导致层间物种无可比性;传统重要值未反映物种的实际生长状况,导致不同样方间同一物种无可比性.针对上述问题提出了相应的改进方法:(1)强化不同重要值计算公式的生态学意义;(2)在同一群落研究中各层次的重要值计算应尽量使用同一公式;(3)将分层统计方法改为群落整体统计方法;(4)在计算公式中加入能反映物种实际生长状态的因子参数.更多还原

【Abstract】 Important Value(IV) is an index to evaluate the importance of a species in community.Four problems of calculating method of traditional IVs were analyzed.First,five indices were selected randomly to make IVs formula by researchers;second,species IVs in different layers were incomparable because different IV were commonly used in different layers;third,species IVs in different layers were incomparable too because tree,shrub and herb layers were calculated respectively;forth,traditional IVs couldn’t reflect species’ actual growth situation,which made the IVs of the same species in different plot were incomparable.Finally,four methods suggestedwere introduced to resolve these four problems:(1)Researchers would better know the exact ecological meanings of different IVs when they make these formulas.(2)The same IV formula would better be used in different layers in one study.(3)IV would better be calculated for total community not for different layers.(4)A parameter was suggested to add to IV formula to inflect species’ space niche.更多还原