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生物多样性通常使用物种丰富度、Simpson指数、Shannon-Wiener多样性指数等来进行度量,但是在土壤动物群落研究中,由于使用了粗水平的分类方法,因此即使生境变化很大,这些多样性指数在评估群落多样性变化时仍然是不适当的。为了克服这种限制,廖崇惠(1990,2009)提出用DG指数来代替这些标准的多样性指数,并在土壤动物生态学领域得到了广泛应用。然而笔者分析发现DG指数与Pielou均匀度指数呈显著的负相关关系(r=–0.534,P=0.000),即,高的均匀度反而有低的多样性。另外,DG指数与类群数(r=0.648,P=0.000)和类群密度(r=0.487,P=0.000)呈明显的正相关,类群数的下降可以通过部分类群密度的上升而获得补偿,群落的类群丢失后却可以获得一个不变的甚至更高的多样性值。因此,笔者不支持DG指数用于测度生物多样性,提议使用各类群实际群势与潜在群势比值的平均值来估计群落潜在多度的实现程度。如果继续使用DG指数作为实际生境条件的一个指标,那么与以往不同,DG指数测度的是该生境群落多度增长的一种潜力。
Biodiversity is usually measured using species richness, Simpson index, Shannon-Wiener diversity index, etc. However, due to the coarse-grained classification method used in soil animal community studies, even if habitat changes vary greatly, Indices are still not appropriate in assessing changes in community diversity. In order to overcome this limitation, Liao Chonghui (1990, 2009) proposed to use the DG index instead of the diversity index of these standards, and has been widely used in the field of soil animal ecology. However, the author found a significant negative correlation between DG index and Pielou evenness index (r = -0.534, P = 0.000), that is, high evenness had low diversity. In addition, the DG index was significantly positively correlated with the number of taxa (r = 0.648, P = 0.000) and taxa (r = 0.487, P = 0.000). The decline of the number of taxa could be compensated by the increase of population density. Of the population lost but can get a constant or even higher diversity value. Therefore, I do not support the use of the DG index for measuring biodiversity. It is proposed that the average of the actual and potential group ratios of each group be used to estimate the degree of potential multi-level achievement of the community. If DG indicators continue to be used as an indicator of actual habitat conditions, the measure of the DG index, unlike in the past, is a potential for the excessive growth of habitat communities.