The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel.
Research Unit for Environmental Genomics, Helmholtz Zentrum München, German Research Center for Environmental Health, 85764 Neuherberg, Germany.
Sci Rep. 2017 Jan 11;7:40266. doi: 10.1038/srep40266.
Sand dunes are unique ecosystems with distinct features which limited the accumulation of biomass. The distance from seashore affects both the physical properties of the sand dunes and the biota living above- and below ground. The goal of the present study was to determine the effects of the distance from shore to inland on soil bacterial community composition during wet and dry season. We studied a chronosequence of sites close to the eastern Mediterranean coast. Bacterial diversity was assessed using directly extracted DNA from soil samples and 16 S ribosomal RNA gene fingerprinting. Our data indicates a significant influence of season and site on bacterial community structure. We showed that during the wet season soil organic matter, pH and salinity strongly influence bacterial community composition, whereas during the dry period bacterial diversity was mainly driven by the shortage of water at all sites. Consequently diversity was lowest during dry season at dunes close to the shore, whereas during the wet season the higher water content and the reduced salinity at the dunes which are more at the inland induced an increase in diversity, which illustrates the pronounced dynamics of microbial communities in soil over a season mainly at inland dunes.
沙丘是具有独特特征的独特生态系统，限制了生物量的积累。距海岸的距离会影响沙丘的物理特性以及地上和地下的生物区系。本研究的目的是确定在干湿季节，距海岸向内陆的距离对土壤细菌群落组成的影响。我们研究了靠近东地中海海岸的一系列地点。使用直接从土壤样本中提取的 DNA 并进行 16S 核糖体 RNA 基因指纹分析来评估细菌多样性。我们的数据表明，季节和地点对细菌群落结构有重大影响。我们表明，在雨季，土壤有机质、pH 值和盐度强烈影响细菌群落组成，而在旱季，所有地点的缺水主要驱动着细菌多样性。因此，在靠近海岸的沙丘，旱季的多样性最低，而在雨季，内陆沙丘的水分含量较高且盐分较低，导致多样性增加，这说明了土壤中微生物群落在一个季节内的明显动态，主要是在内陆沙丘。
