Tree Diversity in Western Kenya: Using Profiles to Characterise Richness and Evenness
Tree Diversity in Western Kenya: Using Profiles to Characterise Richness and Evenness
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肯尼亚西部的树木多样性：利用剖面来表征丰富度和均匀度
DOI：
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发表时间：
2006
影响因子：
3.4
通讯作者：
A. Simons
中科院分区：
文献类型：
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作者：
R. Kindt;P. Damme;A. Simons
物种多样性是物种数量和组成物种丰度均匀度的函数。我们计算了多样性和均匀性概况，这使得比较群落的多样性和均匀性。我们采用的方法来调查肯尼亚西部农场树木的主要功能之间的多样性差异。许多用途组（提供特定用途的所有树木和物种）无法按多样性或均匀性进行排序。没有使用组具有完全均匀的分布。均匀度尤其可以提高建筑材料，水果，观赏，木柴，木材和药物，其中包括一些最丰富的物种组的调查景观。若仅考虑优势种分布的均匀性，则木材、药材、水果和饮料的均匀性最低（60%以上的树木属于这些组的优势种）。这些也是主要由农民通过销售提供现金的使用群体。由于并非所有社区都能按多样性进行排序，因此，试图按多样性对社区进行排序的研究不应以单一指数为基础，甚至不应以几个指数的组合为基础，而应使用为多样性排序而开发的技术，如Rényi多样性概况。本文中描述的多样性特征的稀疏化可以用于比较不同样本量调查结果的研究。
Species diversity is a function of the number of species and the evenness in the abundance of the component species. We calculated diversity and evenness profiles, which allowed comparing the diversity and evenness of communities. We applied the methodology to investigate differences in diversity among the main functions of trees on western Kenyan farms. Many use-groups (all trees and species that provide a specific use) could not be ranked in diversity or evenness. No use-group had perfectly even distributions. Evenness could especially be enhanced for construction materials, fruit, ornamental, firewood, timber and medicine, which included some of the most species-rich groups of the investigated landscape. When considering only the evenness in the distribution of the dominant species, timber, medicine, fruit and beverage ranked lowest (> 60% of trees belonged to the dominant species of these groups). These are also use-groups that are mainly grown by farmers to provide cash through sales. Since not all communities can be ranked in diversity, studies that attempt to order communities in diversity should not base the ordering on a single index, or even a combination of several indices, but use techniques developed for diversity ordering such as the Rényi diversity profile. The rarefaction of diversity profiles described in this article could be used in studies that compare results from surveys with different sample sizes.