Abstract Knowledge of principal environmental factors is essential for understanding the patterns of changes in species richness (SR) in specially protected natural areas. Species richness regression models have been produced for life forms (LFs) predominant in Samarskaya Luka National Park (hemicryptophytes and geophytes). These models have made it possible to identify solar radiation and topography as the principal environmental factors. SR maps show that LFs are spatially separated, which reduces competition between them. It is established that the SR proportion of therophytes on a site occupied by open forest is three times smaller than that in the Middle Volga region; this reflects the effect of the local species pool in the forest community. The SR spectrum of LFs is described by a geometric progression and geographically associated with active geological fault lines.

中文翻译：

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环境因素对南方森林草原植被生命形式多样性的影响

摘要 了解主要环境因素对于了解特别保护区内物种丰富度 (SR) 的变化模式至关重要。已经为萨马尔斯卡亚卢卡国家公园（半隐生植物和土生植物）中占主导地位的生命形式 (LF) 生成了物种丰富度回归模型。这些模型使得将太阳辐射和地形确定为主要环境因素成为可能。SR 地图显示 LF 在空间上是分开的，这减少了它们之间的竞争。已经确定，在开阔森林占据的场地上，良生植物的 SR 比例比中伏尔加地区小 3 倍；这反映了当地物种库在森林群落中的作用。