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首页> 外文期刊>Ecological research >Environmental factors determining the distribution of highland plants at low-altitude algific talus sites
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Environmental factors determining the distribution of highland plants at low-altitude algific talus sites

机译：环境因素决定高海拔距骨站点高地植物的分布

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Algific talus is a micro-scale habitat type where highland plants (subalpine and alpine species) are found, disjunct from their typical range, in lowland forests. On algific talus, cold airflows from the interstices between talus fragments create a local microclimate colder than surrounding forests. Despite of the widely-known occurrence of unique vegetation on algific talus, critical environmental factors determining the distribution of highland species in this habitat type are unclear. In order to reveal the environmental factors enabling highland species to inhabit algific talus, we investigated the vegetation and environments of 26 algific talus sites and four reference (non-algific talus) sites in Hokkaido, northern Japan. Several algific talus sites were dominated by highland species, while some algific talus sites and all non-algific talus sites were dominated by lowland species. Community analysis based on detrended correspondence analysis (DCA) and canonical corresponding analysis (CCA) revealed that the algific talus sites dominated by highland species had lower ground temperature, more acidic soil, larger canopy openness, and less diverse vegetation than the sites dominated by lowland species. Highland plants might be maintained under conditions stressful for lowland plants, resulting in less competitive situation. Generalized linear models (GLM), used to evaluate the response of individual highland species to environmental factors, revealed that preferable environmental conditions for highland plants are highly species specific. These results indicate that the maintenance of diverse environments is crucial for the conservation of the unique vegetation and local populations of highland species in algific talus areas.
机译：高原距骨是一种微尺度的栖息地类型，在低地森林中发现了高地植物（亚高山和高山物种），与典型范围不同。在银色距骨上，距骨碎片之间的空隙产生的冷气流产生了比周围森林还冷的局部小气候。尽管众所周知，在距骨上出现了独特的植被，但尚不清楚决定该栖息地类型中高地物种分布的关键环境因素。为了揭示环境因素，使高地物种能够栖息在距骨上，我们调查了日本北部北海道的26个距骨站点和四个参考（非距骨）站点的植被和环境。几个taltal站点由高地物种占主导，而一些taltal站点和所有非altal talus站点则由低地物种占主导。基于趋势对应分析（DCA）和规范对应分析（CCA）的群落分析表明，与高地物种相比，高地物种占优势的距骨点地温较低，酸性更强，冠层开放度更大，植被多样性更低。种类。高地植物可能会维持在对低地植物充满压力的条件下，从而导致竞争状况减弱。用于评估各个高原物种对环境因素的响应的广义线性模型（GLM）显示，高原植物的优选环境条件具有很高的物种特异性。这些结果表明，保持多样化的环境对于保护距骨地区的独特植被和高原物种的本地种群至关重要。

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