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首页> 外文期刊>Plant and Soil >Spatial Variability of Soil Chemical Properties of a PrairieForest Transition in Louisiana
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Spatial Variability of Soil Chemical Properties of a PrairieForest Transition in Louisiana

机译：路易斯安那州草原森林过渡带土壤化学性质的空间变异

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Woody plant expansion, particularly eastern red cedar (Juniperus virginiana L.), has been a major threat to Louisiana calcareous prairies. Previous studies have shown that woody plant expansion into grasslands is associated with an increase in soil heterogeneity. We studied the within site spatial variability and among site differences of surface (0–15cm depth) soil pH, electrical conductivity (EC), and Mehlich III extractable Ca, Mg, K, Fe and Mn from three remnant prairie-forest associations in Winn Parish, Louisiana. The prairie soil was consistently basic (pH7.0) and the forest soil was acidic (pH7.0) while the transition soil was neutral (pH7.0). A nonparametric statistical test for the equality of medians among sites showed the median valuesof the soil attributes differed (α=0.05) except for soil Ca and Fe. The similarity in Ca concentration among sites was attributed to the calcareous parent material common to the three sites. Geostatistical analysis showed that spatial dependence was expressed over a range of 20–30 m for most of the soil attributes considered. Semivariogram shapes were similar among sites, suggesting the greater control of soil parent material on the observed spatial soil pattern. Shorter range of variation emerged only for soil pH when soil data from the forest and transition were deleted, indicating the scaling characteristics of soil pH and its susceptibility to plant induced changes. It is concluded that soil pH can be used as an index to determine prairie-forest boundary, and to access the impact of eastern red cedar on these and similar sites derived from calcareous parent material. Further, results from this study can be used for designing future ecological studies within the prairie by taking the soil spatial variability into account.
机译：木本植物的扩张，特别是东部红柏（Juniperus virginiana L.），已成为路易斯安那州钙质大草原的主要威胁。先前的研究表明，木本植物向草原的扩张与土壤异质性的增加有关。我们研究了Winn地区三个残留的草原-森林协会中地表内空间变异性以及地表（0-15cm深度）土壤pH，电导率（EC）和Mehlich III可提取的Ca，Mg，K，Fe和Mn的站点间差异。路易斯安那州教区。草原土壤始终为碱性（pH7.0），森林土壤为酸性（pH7.0），而过渡土壤为中性（pH7.0）。站点间中位数均等性的非参数统计检验表明，除土壤钙和铁外，其他土壤属性中位数均不同（α= 0.05）。这些位点之间钙浓度的相似性归因于这三个位点共有的钙质母质。地统计分析表明，对于大多数考虑的土壤属性，空间依赖性在20–30 m的范围内表达。各地点之间的半变异函数形状相似，这表明在观测的空间土壤格局上对土壤母体物质的控制更大。当删除来自森林和过渡带的土壤数据时，仅在土壤pH值上出现了较小的变化范围，这表明土壤pH值的缩放特性及其对植物诱发的变化的敏感性。结论是，土壤pH可以作为确定草原-森林边界的指标，并可以利用东部红柏对钙质母质来源的这些和类似地点的影响。此外，该研究的结果可用于通过考虑土壤空间变异性来设计草原内未来的生态研究。

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