Woody and herbaceous plants are differentially influenced by the environment, with non‐random association with the evolutionary history of these taxa and their traits. In general, woody plants may have climate‐dominated niches, whereas herbaceous plants may have edaphic and microhabitat‐dominated niches. Here, we explored and mapped how the patterns of species richness, phylogenetic diversity, and structures of total, woody, and herbaceous plants vary across the geographical regions and with respect to 12 environmental variables across Ethiopia and Eritrea, in the horn of Africa. Our result showed that both richness and phylogenetic diversity had almost the same tendency in total woody and herbaceous plants, in which they showed positive relationships with annual precipitation, precipitation annual range of climate, all the three variables of topography, and total nitrogen and total extractable phosphorus of soil, and negative relations with mean annual temperature. Compared with the total and herbaceous plants, the environmental variables explained greater variance both in the standardized effect size phylogenetic diversity and net relatedness index for woody plants. Our results highlight that, on the large spatial scales, the environmental filtering process has played a greater role in structuring species into local communities for woody plants than for herbaceous plants.

中文翻译：

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非洲之角生物多样性热点地区被子植物不同生长形式的物种丰富度和系统发育多样性

木本植物和草本植物受环境的影响不同，与这些类群的进化历史及其特征具有非随机关联。一般来说，木本植物可能有气候主导的生态位，而草本植物可能有土壤和微生境主导的生态位。在这里，我们探索并绘制了物种丰富度、系统发育多样性以及总、木本和草本植物结构的模式如何在不同地理区域以及埃塞俄比亚和厄立特里亚（非洲之角）的 12 个环境变量之间发生变化。我们的结果表明，在总木本和草本植物中，丰富度和系统发育多样性都具有几乎相同的趋势，它们与年降水量、气候年降水量范围、地形、土壤总氮和总磷的三个变量均与年平均气温呈负相关。与总植物和草本植物相比，环境变量解释了木本植物标准化效应大小系统发育多样性和净相关性指数的更大差异。我们的结果强调，在大空间尺度上，与草本植物相比，环境过滤过程在将物种构建为木本植物的当地群落方面发挥了更大的作用。环境变量解释了木本植物标准化效应大小系统发育多样性和净相关性指数的更大差异。我们的结果强调，在大空间尺度上，与草本植物相比，环境过滤过程在将物种构建为木本植物的当地群落方面发挥了更大的作用。环境变量解释了木本植物标准化效应大小系统发育多样性和净相关性指数的更大差异。我们的结果强调，在大空间尺度上，与草本植物相比，环境过滤过程在将物种构建为木本植物的当地群落方面发挥了更大的作用。