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首页> 外文期刊>Ecological research >Spore diversity of arbuscular mycorrhizal fungi in human-modified neotropical ecosystems
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Spore diversity of arbuscular mycorrhizal fungi in human-modified neotropical ecosystems

机译：人类改良的新热带生态系统中丛枝菌根真菌的孢子多样性

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摘要

Neotropical landscapes are diverse mosaics of ecosystems commonly resulting from different degrees of human intervention. Although easily recognized by their vegetation, the associated soil microbiota including arbuscular mycorrhizal fungi (AMF) is little known. In Mexico, native tropical rainforest and native savannas are rapidly vanishing, remaining in few spots surrounded by human-made ecosystems. It is unknown, however, how such vegetation types differ in their AMF communities. We compared the spore diversity, spore density and root colonization by AMF in contiguous mosaics of tropical rainforest, savanna and two pine plantations, one managed and the other unmanaged. We detected indicator species associated with tropical rainforest. The savanna displayed the highest values of root colonization of AMF and the lowest spore density. Conversely, the highest spore density and the lowest root colonization rates were found in the tropical rainforest. The two pine plantations showed intermediate values of spore density and colonization between tropical rainforest and the savanna. We did not detect significant seasonal differences (between dry and rainy seasons) in AMF species richness, spore density and root colonization within the vegetation types (except for root colonization in the savanna). Soil cation exchange capacity, phosphorus and nitrogen were negatively associated with AMF spore density and species richness. Our findings suggest that contiguous vegetation types in neotropical landscapes may display significant differences in AMF species composition, spore density and root colonization, and that such differences can be explained in part by soil properties and levels of human intervention.
机译：新热带景观是生态系统的多种多样的马赛克，通常是由于不同程度的人类干预导致的。尽管很容易被其植被识别，但包括丛枝菌根真菌（AMF）在内的相关土壤微生物群却鲜为人知。在墨西哥，当地的热带雨林和热带稀树草原正在迅速消失，仅存于人造生态系统所包围的几个地方。但是，未知的是，这些植被类型在其AMF群落中有何不同。我们比较了热带雨林，热带稀树草原和两个松树人工林（其中一个被管理而另一个未被管理）的连续镶嵌中的AMF的孢子多样性，孢子密度和根部定植。我们检测到与热带雨林相关的指示物种。稀树草原显示出最高的AMF根定植值和最低的孢子密度。相反，在热带雨林中发现最高的孢子密度和最低的根定殖率。这两个松树人工林在热带雨林和热带稀树草原之间显示出中等的孢子密度和定殖值。我们未发现植被类型内的AMF物种丰富度，孢子密度和根部定植（除了热带稀树草原的根部定植）在季节性（干旱和雨季之间）之间没有显着的季节性差异。土壤阳离子交换能力，磷和氮与AMF孢子密度和物种丰富度呈负相关。我们的发现表明，新热带景观中的连续植被类型可能在AMF物种组成，孢子密度和根部定植方面显示出显着差异，并且这种差异可以部分由土壤性质和人工干预水平来解释。

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