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引用次数: 0
摘要
在阿维尼翁大学的约安-勒巴古塞-宾盖(Yoann Le Bagousse-Pinguet)的带领下,一个国际研究小组对全球旱地进行了实地调查,收集了所遇到的 301 种植物的形态、性状和化学成分数据。这个阈值代表了从半干旱到干旱条件的过渡,以往的研究表明,一旦超过这个阈值,就会发生突然的变化,包括土壤肥力、植物生产力、植被和物种丰富度的下降。本研究发现,植物功能多样性的增加与植物覆盖率的下降同时出现,这令人吃惊,因此本研究的作者推测,植物性状多样性的增加是由于植物与植物之间的相互作用被打破,从而使独特的物种摆脱了竞争。支持这一观点的发现是,放牧压力的增加(植物覆盖率下降的主要驱动因素)扩大了植物性状空间,并调节了性状多样性增加的干旱阈值。
期刊介绍:
Nature Plants is an online-only, monthly journal publishing the best research on plants — from their evolution, development, metabolism and environmental interactions to their societal significance.