（community coefficients/ similarity coefficients） 在群落生态学研究中,要把特征相似的群落进行比较,找出它们之间相似程度,即为群落系数，也叫相似度系数。
在种群生态学的研究中，要把特征相似的群落进行比较，找出它们之间的相似程度，即群落系数（coefficient of community）。计算群落相似性系数的方法很多，下面介绍2种常用的方法。
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用种面积曲线和群落系数面积曲线的方法对宜昌梅子垭地区一种主要植物群落类型的最小面积进行了研究。
The minimum sampling area of a major plant community in Meiziya Region was studied by using methods of species area curves and community coefficient area curves.
该模型用于模拟发生严重荒漠化的鄂尔多斯高原植物群落的季节及年生长、叶片投影盖度、蒸发系数。
The model was developed to simulate seasonal and annual growth, foliage projective cover (FPC), and evaporative coefficient in the Ordos plateau, where serious desertification happened recently.
从蚂蚁群落相似性系数来看，4种植被亚型的原始林和次生林蚂蚁物种的组成均具有显著差异。
According to the Jaccard similarity coefficient, the composition of the ant species all has distinct difference between primeval and secondary forests of the 4 vegetation subtypes.
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