Arbuscular mycorrhizal fungi (AMF) are obligate symbionts that establish a mycorrhizal interaction with nearly 80% of terrestrial vascular plants. However, their diversity in tropical low flooding forest (TLFF) has not been characterized, and their distribution patterns in natural environments are not fully clear. Our objective was to determine the diversity and distribution of AMF in the TLFF of Yucatan, Mexico. We selected four sites of TLFF where the basal area of trees, herbaceous plant cover and richness and abundance of trees, herbaceous vegetation and AMF were determined. In addition, we determined the quantity of available phosphorus, cation exchange capacity, percentage of organic matter and pH in the soil at these sites. We found significant differences between sites in terms of tree basal area, herbaceous vegetation diversity and in all of the soil variables. We identified 11 species of AMF, and the greatest diversity was found in the site with the least observable anthropogenic disturbance. The abundance of AMF was positively related to the basal area and abundance of the arboreal vegetation and negatively related to the chemical soil properties measured. Our results indicate that the distribution of AMF in TLFF is related to the characteristics of vegetation, chemical parameters of the soil and identity of the AMF. This study sheds additional information to our understanding of the factors involved in AMF distribution in natural flooding environments.

中文翻译：

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墨西哥热带低洪森林中丛枝菌根真菌的多样性与分布

丛枝菌根真菌（AMF）是专性共生体，与近80％的陆地维管植物建立了菌根相互作用。然而，它们在热带低洪森林（TLFF）中的多样性尚未得到表征，并且它们在自然环境中的分布方式也不十分清楚。我们的目标是确定墨西哥尤卡坦州TLFF中AMF的多样性和分布。我们选择了TLFF的四个位置，确定了树木的基础面积，草本植物的覆盖率以及树木，草本植物和AMF的丰富度和丰度。此外，我们确定了这些地点土壤中的有效磷含量，阳离子交换能力，有机质百分比和pH。我们发现站点之间在树的基础面积方面存在显着差异，草本植被的多样性以及所有土壤变量。我们确定了11种AMF，在该地区发现的人为干扰程度最小，多样性最大。AMF的丰度与树木的基础面积和丰度呈正相关，与所测化学土壤的性质呈负相关。我们的研究结果表明，TLFF中AMF的分布与植被特征，土壤化学参数和AMF的特性有关。这项研究为我们了解自然洪水环境中AMF分布所涉及的因素提供了更多信息。AMF的丰度与树木的基础面积和丰度呈正相关，与所测化学土壤的性质呈负相关。我们的研究结果表明，TLFF中AMF的分布与植被特征，土壤化学参数和AMF的特性有关。这项研究为我们了解自然洪水环境中AMF分布所涉及的因素提供了更多信息。AMF的丰度与树木的基础面积和丰度呈正相关，与所测化学土壤的性质呈负相关。我们的研究结果表明，TLFF中AMF的分布与植被特征，土壤化学参数和AMF的特性有关。这项研究为我们了解自然洪水环境中AMF分布所涉及的因素提供了更多信息。