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首页> 外文期刊>Oecologia >The relative importance of vertical soil nutrient heterogeneity, and mean and depth-specific soil nutrient availabilities for tree species richness in tropical forests and woodlands
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The relative importance of vertical soil nutrient heterogeneity, and mean and depth-specific soil nutrient availabilities for tree species richness in tropical forests and woodlands

机译：垂直土壤养分异质性以及平均和深度特定土壤养分有效性对热带森林和林地树木物种丰富度的相对重要性

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The relative importance of resource heterogeneity and quantity on plant diversity is an ongoing debate among ecologists, but we have limited knowledge on relationships between tree diversity and heterogeneity in soil nutrient availability in tropical forests. We expected tree species richness to be: (1) positively related to vertical soil nutrient heterogeneity; (2) negatively related to mean soil nutrient availability; and (3) more influenced by nutrient availability in the upper than lower soil horizons. Using a data set from 60, 20 x 40-m plots in a moist forest, and 126 plots in miombo woodlands in Tanzania, we regressed tree species richness against vertical soil nutrient heterogeneity, both depth-specific (0-15, 15-30, and 30-60 cm) and mean soil nutrient availability, and soil physical properties, with elevation and measures of anthropogenic disturbance as co-variables. Overall, vertical soil nutrient heterogeneity was the best predictor of tree species richness in miombo but, contrary to our prediction, the relationships between tree species richness and soil nutrient heterogeneity were negative. In the moist forest, mean soil nutrient availability explained considerable variations in tree species richness, and in line with our expectations, these relationships were mainly negative. Soil nutrient availability in the top soil layer explained more of the variation in tree species richness than that in the middle and lower layers in both vegetation types. Our study shows that vertical soil nutrient heterogeneity and mean availability can influence tree species richness at different magnitudes in intensively utilized tropical vegetation types.
机译：资源异质性和数量对植物多样性的相对重要性是生态学家之间不断争论的话题，但是我们对热带森林土壤养分的树木多样性和异质性之间关系的知识知之甚少。我们期望树木物种丰富度为：（1）与垂直土壤养分异质性呈正相关; （2）与平均土壤养分利用率负相关; （3）在较高的土壤层位上比较低的土壤层位受养分利用率更高。利用来自潮湿森林中60、20 x 40米的地块和坦桑尼亚的Miombo林地的126个地块的数据集，我们针对垂直土壤养分异质性回归了树种的丰富度，这两种都是特定于深度的（0-15、15-30和30-60厘米），以及土壤养分的可利用性和土壤物理性质，以及海拔高度和人为干扰的度量作为协变量。总体而言，垂直土壤养分异质性是密博县树木物种丰富度的最佳预测因子，但与我们的预测相反，树木物种丰富度与土壤养分异质性之间的关系为负。在湿润的森林中，平均土壤养分利用率解释了树木物种丰富度的巨大差异，并且与我们的预期相符，这些关系主要是负相关。在这两种植被类型中，表层土壤层中的土壤养分有效性比中层和下层树种丰富度的变化更多。我们的研究表明，在高强度利用的热带植被类型中，垂直土壤养分的异质性和平均有效性会影响树种的丰富程度。

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