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Components of spatial patterning in a serpentine grassland

机译：蛇形草地空间格局的组成

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We analyzed the components of spatial patterning in species abundance in a diverse grassland dominated by early season, annual forbs. Species abundance, soil depth and gopher disturbances were measured by means of a nested spatial design on two 8 m X 20 m plots that differed in the amount of larger scale variability in soil depth. Species distributions at the scale of the 10 cm X 10 cm quadrat were highly clumped, with a decline in clumping with mean abundance. Even with the effect of abundance on clumping removed, species showed differences in the degree of clumping and these differences were consistent between the two plots. The abundance of the species and the frequency of disturbance correlated weakly to moderately with soil depth. Semivariance analyses indicated that the most common species all showed complex spatial patterning at a range of scales. Some of this variation corresponded to patterns of soil depth variation and patterns of gopher disturbance; however, a large amount of the spatial patterning in species abundance remains unexplained.
机译：我们分析了在以早期季节，一年生禾本科为主的多样化草地中物种丰富度的空间格局的组成部分。通过嵌套的空间设计，在两个8 m X 20 m的样地上测量了物种的丰度，土壤深度和地鼠干扰，这些样地在土壤深度的较大尺度变化量上有所不同。 10 cm X 10 cm方形的尺度上的物种分布高度成簇，成簇下降且平均丰度下降。即使去除了富集对结块的影响，物种也表现出结块程度的差异，并且这些差异在两个样区之间是一致的。物种的丰富度和干扰频率与土壤深度呈弱至中度相关。半方差分析表明，最常见的物种在一定范围内都显示出复杂的空间格局。这种变化中的一些对应于土壤深度变化的模式和地鼠干扰的模式。然而，物种丰富度的大量空间格局仍然无法解释。

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