Precipitation shapes communities of arbuscular mycorrhizal fungi in Tibetan alpine steppe.
Precipitation shapes communities of arbuscular mycorrhizal fungi in Tibetan alpine steppe.
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降水塑造西藏高寒草原丛枝菌根真菌群落
DOI：
10.1038/srep23488
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发表时间：
2016-03-22
影响因子：
4.6
通讯作者：
Cui X
中科院分区：
文献类型：
--
作者：
Zhang J;Wang F;Che R;Wang P;Liu H;Ji B;Cui X
青藏高原是包括丛枝菌根真菌（AMF）在内的生物最大和最独特的栖息地之一。然而，目前尚不清楚AMF社区如何应对这种恶劣环境中的关键环境变化。为了验证降水是否是区域尺度上AMF群落结构形成的驱动力，我们研究了西藏高寒草原中与优势植物沿着降水梯度相关的AMF群落。从年降水量在400 ~ 50 mm之间的5个样点采集了降雨圈土壤。共鉴定了31个AMF操作分类单位（OTU）。AMF群落组成的网站之间的差异显着，而AMF群落组成并没有不同的植物物种。通径分析表明，降水量直接影响AMF菌丝长度密度，并可能通过植被覆盖度的中介作用间接影响AMF物种丰富度。研究结果表明，水资源的可利用性可以驱动AMF群落在区域尺度的变化。鉴于AMF在植物群落动态中的重要作用，探讨AMF群落沿着关键环境梯度的变化将有助于我们更好地预测西藏植被对未来气候变化的生态系统水平响应。
Tibetan Plateau is one of the largest and most unique habitats for organisms including arbuscular mycorrhizal fungi (AMF). However, it remains unclear how AMF communities respond to key environmental changes in this harsh environment. To test if precipitation could be a driving force in shaping AMF community structures at regional scale, we examined AMF communities associated with dominant plant species along a precipitation gradient in Tibetan alpine steppe. Rhizosphere soils were collected from five sites with annual precipitation decreasing from 400 to 50 mm. A total of 31 AMF operational taxonomic units (OTUs) were identified. AMF community composition varied significantly among sites, whereas AMF community composition did not vary among plant species. Path analysis revealed that precipitation directly affected AMF hyphal length density, and indirectly influenced AMF species richness likely through the mediation of plant coverage. Our results suggested that water availability could drive the changes of AMF communities at regional scale. Given the important roles AMF could play in the dynamics of plant communities, exploring the changes of AMF communities along key environmental gradients would help us better predict the ecosystem level responses of the Tibetan vegetation to future climate change.