Diversity of arbuscular mycorrhizal fungi along an environmental gradient in the Brazilian semiarid
Diversity of arbuscular mycorrhizal fungi along an environmental gradient in the Brazilian semiarid
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DOI：
10.1016/j.apsoil.2014.07.008
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发表时间：
2014-12-01
影响因子：
4.8
通讯作者：
Maia, Leonor Costa
中科院分区：
文献类型：
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作者：
da Silva, Iolanda Ramalho;Aragao de Mello, Catarina Maria;Maia, Leonor Costa
在全球尺度上，植物寄主、环境特性和扩散限制是影响丛枝菌根真菌(AMF)多样性的主要因素，而在局部尺度上，其他因素也可能影响AMF群落的组成。因此，本研究的目的是评估AMF的多样性，并将其与植物物种丰富度、季节(干旱或降雨)和沿环境梯度的土壤参数联系起来，以了解哪些因素是巴西半干旱地区AMF空间分布的驱动因素。坡度由干旱林(DF)、过渡带(TZ)和湿润林(MF)组成。在每个站点的雨季(2011年8月)和旱季(2012年2月)采集了10个土壤样本。测定了土壤性质和AMF多样性，后者以形态孢子鉴定为基础。在大多数土壤化学参数上，DF区与其他两个区差异显著，而MF区和TZ区的大部分土壤属性相似。共鉴定出50种AM真菌，优势属为无梗霉属和球囊霉属。通过排序(NMDS)和统计学方法(PERMANOVA)，DF的AMF群落结构与其他两个地区有显著差异。然而，基于Shannon指数的物种多样性最高出现在TZ。不同季节AMF群落结构不同，旱季分生孢子丰度较高。AMF的空间分布受寄主、季节等因素的影响，但土壤是主要影响因素。根据BIONAL-ENV分析，4种土壤属性与AMF群落组成(锌、镁、盐基饱和度和粘粒)的相关性约为60%。我们认为，植被、季节变化和土壤类型影响着AMF多样性，后者是巴西半干旱地区AMF群落相似性/差异性的关键因素。(C)2014爱思唯尔B.V.保留所有权利。
Plants host, environmental characteristics and dispersal limitation are the main factors affecting the diversity of arbuscular mycorrhizal fungi (AMF) in global scale, whereas at the local scale other factors might also influence the composition of the AMF community. Therefore, the objective of this study was to assess the diversity of AMF and to relate it with the richness of plant species, season (dry or rainy) and soil parameters along an environmental gradient to know which are the drivers of the spatial distribution of AMF in the Brazilian semiarid. The gradient was composed of a dry forest (DF), a transitional zone (TZ) and a moist forest (MF). Ten soil samples were collected during the rainy (August 2011) and dry (February 2012) seasons in each site. The soil properties were determined, as well as AMF diversity, the latter based on morphological spore identification. There were significant differences between the DF and the other two areas in most soil chemical parameters, whereas the majority of soil attributes in the MF and TZ were similar. Altogether, 50 AMF species were identified, and the genera Acaulospora and Glomus were predominant. The AMF community structure in DF was significantly different from the other two areas by ordination (NMDS) and statistical method (PERMANOVA). However, the highest species diversity, based on the Shannon index, occurred in the TZ. The AMF community structure differed between seasons, with greater spore abundance in the dry season. Spatial AMF distribution was influenced by plants host, season, but the soil was the main factor. Four edaphic attributes showed approximately 60% of correlation with AMF community composition (Zn, Mg, base saturation and clay) based on the BIO-ENV analysis. We conclude that vegetation, seasonal variations and soil type affect the AMF diversity, and that the latter is a key factor for the similarity/dissimilarity of AMF communities between areas in the Brazilian semiarid. (C) 2014 Elsevier B.V. All rights reserved.