PROBLEMS IN THE MEASUREMENT OF EVENNESS IN ECOLOGY
PROBLEMS IN THE MEASUREMENT OF EVENNESS IN ECOLOGY
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DOI：
10.2307/3544465
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发表时间：
1981-01-01
期刊：
影响因子：
3.4
通讯作者：
ALATALO, RV
中科院分区：
文献类型：
--
作者：
ALATALO, RV
均匀度被认为是衡量一个社区中财富平等的标准。通过比较人工丰度分布，发现修正希尔比(N2-1)/(N1-1)是最容易解释的均匀度度量。当物种多样性较低时，修改（从Hill数中减去1）是重要的。群落的物种丰富度往往被低估，由于采样偏差，均匀度指数建议不使用物种丰富度。最流行的均匀度指数J”似乎是一个相当模糊的测量，因为它是纯粹的数学原因与物种丰富度正相关。这种模糊性源于Shannon熵H与物种丰富度的对数关系。希尔的以物种为单位的数量比一般的多样性测量方法更明确。需要强调的是，没有单一的方法来衡量均匀性，由于这一概念的松散性，建议在应用时谨慎。
Evenness is considered as the measure of equality of abundances in a community. By comparing artificial abundance distributions the modified Hill''s ratio (N2-1)/(N1-1) was found to be the most easily interpreted evenness measure. The modification (subtracting 1 from Hill''s numbers) is important when species diversity is low. Often the species richness of the community is underestimated and because of the sampling bias evenness indices not using species richness are recommendable. The most popular evenness index J'' seems to be a rather ambiguous measure, since it is for purely mathematical reasons positively correlated with species richness. The ambiguity arises from the logarithmic relation of Shannon''s entropy H'' to species richness. Hill''s numbers with species as units are less ambiguous than diversity measures in general. It is emphasized that there is no single way to measure evenness and because of the looseness of the concept caution is advised in its application.