Soil Microbial Diversity in the Vicinity of Desert Shrubs

被引:0
作者
Vered Saul-Tcherkas
Adrian Unc
Yosef Steinberger
机构
[1] Bar-Ilan University,The Mina & Everard Goodman Faculty of Life Sciences
[2] New Mexico State University,Plant and Environmental Sciences
来源
Microbial Ecology | 2013年 / 65卷
关键词
Actinobacteria; Bacteroidetes; Ethylene Diamine Tetraacetic Acid; Ethylene Diamine Tetraacetic Acid; Taxonomic Diversity;
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中图分类号
学科分类号
摘要
Water and nutrient availability are the major limiting factors of biological activity in arid and semiarid ecosystems. Therefore, perennial plants have developed different ecophysiological adaptations to cope with harsh conditions. The chemical profile of the root exudates varies among plant species and this can induce variability in associated microbial populations. We examined the influence of two shrubs species, Artemisia sieberi and Noaea mucronata, on soil microbial diversity. Soil samples were collected monthly, from December 2006 to November 2007, near canopies of both shrubs (0–10-cm depth). Samples were used for abiotic tests and determination of soil bacterial diversity. No significant differences were found in the abiotic variables (soil moisture, total organic matter, and total soluble nitrogen (TSN)) between soil samples collected from under the two shrubs during the study period. No obvious differences in the Shannon–Weaver index, evenness values, or total phylogenetic distances were found for the soil microbial communities. However, detailed denaturing gradient gel electrophoresis (DGGE) clustering as well as taxonomic diversity analyses indicated clear shifts in the soil microbial community composition. These shifts were governed by seasonal variability in water availability and, significantly, by plant species type.
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页码:689 / 699
页数:10
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