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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：孢子多样性在人改进的新生生态系统中丛枝菌根真菌

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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：新景观景观是常见于不同程度的人类干预的生态系统的多样化马赛克。虽然通过植被容易地识别，但包括丛枝菌根真菌（AMF）的相关土壤微生物群是鲜为人知的。在墨西哥，天然热带雨林和本土大草原正在迅速消失，仍然存在于众多斑点，被人造生态系统包围。然而，它是未知的，这种植被类型如何在其AMF社区中不同。我们将孢子多样性，孢子密度和根殖民与热带雨林，大草原和两种松树种植园的连续马赛克进行比较，一个管理，另一个未被囚犯。我们检测到与热带雨林相关的指示物种。大草属展示了AMF的根定子的最高值和最低的孢子密度。相反，在热带雨林中发现了最高的孢子密度和最低的根殖民率。这两个松树种植园显示了热带雨林和大草原之间的孢子密度和殖民的中间值。我们在植被类型内的AMF物种丰富性，孢子密度和根殖民化的巨大季节性差异（干燥和雨季之间）（除草原中的根殖民除外）。土壤阳离子交换能力，磷和氮与AMF孢子密度和物种丰富性负相关。我们的研究结果表明，新景观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中显示出显着差异，并且可以部分地通过土壤性质和人为干预水平来解释这种差异。

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