Mountains are rugged structures in the landscape that are difficult to delineate. Given that they host an overproportional fraction of biodiversity of high ecological and conservational value, conventions on what is mountainous and what not are in need. This short communication aims at explaining the differences among various popular mountain definitions. Defining mountainous terrain is key for global assessments of plant species richness in mountains and their likely responses to climatic change, as well as for assessing the human population density in and around mountainous terrain.

中文翻译：

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山的定义及其后果

山脉是景观中难以描绘的崎岖结构。鉴于它们拥有高生态和保护价值的生物多样性的比例过高，关于什么是山区和什么不需要的公约。这篇简短的交流旨在解释各种流行的山脉定义之间的差异。定义山区是全球评估山区植物物种丰富度及其对气候变化的可能反应以及评估山区及其周围人口密度的关键。