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首页> 外文期刊>Soil Biology & Biochemistry >Abiotic conditions and plant cover differentially affect microbial biomass and community composition on dune gradients
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Abiotic conditions and plant cover differentially affect microbial biomass and community composition on dune gradients

机译：非生物条件和植物覆盖度对沙丘梯度上的微生物生物量和群落组成有不同的影响

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摘要

Dune systems are characterized by strong gradients of physical stress, with blowing sand and salt spray decreasing with distance from the ocean, and soil nutrients increasing. In this study we ask how soil microbial community composition and biomass change along transects away from the ocean, and whether these changes are regulated by abiotic stress or by resource availability. We collected bulk soil from under three plant species representative of the dune front, back, and flat: Ammophila breviligulata, Rosa rugosa, and Myrica pensylvanica. The biomass and composition of microbial communities were examined using phospholipid fatty acid (PLFA) analysis under patches of dominant vegetation, and in paired bare plots. We found that microbial biomass was strongly correlated with soil C, and thus the presence of vegetation. Community composition, on the other hand, varied with abiotic stresses, especially soil salinity. These variables in turn depended on distance from the shore, and were ameliorated in some cases by vegetation. These findings demonstrate that biomass and community composition are influenced by different environmental variables. Thus, relationships between biomass and composition are unlikely to be readily predicted on the basis of a single resource.
机译：沙丘系统的特征在于强烈的物理应力梯度，随着离海洋的距离，吹沙和盐雾会减少，土壤养分也会增加。在这项研究中，我们询问土壤微生物群落组成和生物量如何沿远离海洋的样带变化，以及这些变化是否受到非生物胁迫或资源可利用性的调节。我们从代表沙丘的正面，背面和平坦的三种植物物种下收集了散装土壤：短孢氨虫，皱叶蔷薇和杨梅。使用磷脂脂肪酸（PLFA）分析在优势植被斑块和成对裸露地块中检查了微生物群落的生物量和组成。我们发现微生物生物量与土壤C密切相关，因此与植被有关。另一方面，群落组成随非生物胁迫特别是土壤盐分的变化而变化。这些变量反过来取决于离海岸的距离，在某些情况下，植被可以改善这些变量。这些发现表明，生物量和群落组成受不同环境变量的影响。因此，基于单一资源不太可能容易地预测生物量和组成之间的关系。

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