Habitat characterizations underestimate the role of edaphic factors controlling the distribution of Entandrophragma
Habitat characterizations underestimate the role of edaphic factors controlling the distribution of Entandrophragma
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DOI：
10.1890/03-0043
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发表时间：
2004-08-01
期刊：
影响因子：
4.8
通讯作者：
Gregoire, TG
中科院分区：
文献类型：
--
作者：
Hall, JS;McKenna, JJ;Gregoire, TG
人们已经开发并测试了许多理论来解释热带森林的高度植物多样性，从强调机会重要性的非平衡理论到描述占据狭窄生态位的高度专业化物种的平衡理论。基于生态位的理论最常评估物种对不同光环境的适应，但一些研究评估了土壤属性在控制物种分布中的重要性。我们在中非共和国 Dzanga-Sangha 茂密森林保护区的 100 公顷土地上评估了土壤因素在控制非洲桃花心木属 Entandrophragma 分布中的作用。这项研究超越了地形或其他类别土壤条件的简单表征，以测试与已知对植物生长重要的化学和物理土壤参数的特定关联。所评估的四种内生树的树径大于或等于 30 cm 的树木在森林中呈非随机分布。环面平移测试表明，没有一个物种表现出任何地形偏好。然而，这四个物种中的三个与至少两种土壤化学属性具有显着关联。评估土壤化学和物理特性与地形位置之间联系的随机化测试强调了这种关系的复杂性，并表明从广泛而简单定义的栖息地类别推断土壤属性可能会大大低估土壤异质性在促进物种共存方面的重要性。
Numerous theories have been developed and tested to explain the high botanical diversity in tropical forests, ranging from nonequilibrium theories emphasizing the importance of chance to equilibrium theories depicting highly specialized species occupying narrow ecological niches. Niche-based theories have most often evaluated species adaptation to different light environments, but some studies have evaluated the importance of edaphic attributes in controlling species distributions. We evaluated the role of edaphic factors in controlling the distribution of African mahogany in the genus Entandrophragma on a 100-ha plot in the Dzanga-Sangha Dense Forest Reserve, Central African Republic. This study went beyond simple characterization of edaphic conditions in topographic or other classes to test for specific associations with chemical and physical soil parameters known to be kimportant to plant growth. Trees greater than or equal to30 cm dbh of the four species of Entandrophragma evaluated were nonrandomly distributed in the forest. Torus translation tests indicated that none of the species exhibited any topographic preferences. However, three of the four species had significant associations with at least two soil chemical attributes. Randomization tests evaluating links between soil chemical and physical properties and topographic position underscored the complexity of the relationship and suggest that inferring edaphic attributes from broadly and simply defined habitat classes may significantly underestimate the importance of soil heterogeneity in contributing to species coexistence.