Alpha, Beta, Gamma 多样性

总述:生物多样性--生命有机体及其赖以生存的生态综合体的多样化和变异性--是指生命形式的多样化(从类病毒、病毒、细菌、支原体、真菌到动物界与植物界),各种生命形式之间的多种相互作用,以及各种生物群落、生态系统及其生境与生态过程的复杂性(李博 等,2000)。

所谓α多样性是指一个特定区域或生态系统内的多样性,经常用物种丰富度来度量;

β多样性是不同生态系统之间多样性的比较,是物种组成沿环境梯度或者在群落间的变化率,用来表示生物种类对环境异质性的反应;

γ多样性是指大区域(地理区域)上总的多样性。

Alpha diversityFrom Wikipedia, the free encyclopedia

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Alpha diversity (α-diversity) is the biodiversity within a particular area, community or ecosystem, and is usually expressed as the Species richness of the area. This can be measured by counting the number of taxa (distinct groups of organisms) within the ecosystem (eg. familiesgeneraspecies). However, such estimates of species richness are strongly influenced by sample size, so a number of statistical techniques can be used to correct for sample size to get comparable values.


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