Skip to main content
U.S. flag

An official website of the United States government

Dryland soil microbial communities display spatial biogeographic patterns associated with soil depth and soil parent material

May 1, 2013

Biological soil crusts (biocrusts) are common to drylands worldwide. We employed replicated, spatially nested sampling and 16S rRNA gene sequencing to describe the soil microbial communities in three soils derived from different parent material (sandstone, shale, and gypsum). For each soil type, two depths (biocrusts, 0–1 cm; below-crust soils, 2–5 cm) and two horizontal spatial scales (15 cm and 5 m) were sampled. In all three soils, Cyanobacteria and Proteobacteria demonstrated significantly higher relative abundance in the biocrusts, while Chloroflexi and Archaea were significantly enriched in the below-crust soils. Biomass and diversity of the communities in biocrusts or below-crust soils did not differ with soil type. However, biocrusts on gypsum soil harbored significantly larger populations of Actinobacteria and Proteobacteria and lower populations of Cyanobacteria. Numerically dominant operational taxonomic units (OTU; 97% sequence identity) in the biocrusts were conserved across the soil types, whereas two dominant OTUs in the below-crust sand and shale soils were not identified in the gypsum soil. The uniformity with which small-scale vertical community differences are maintained across larger horizontal spatial scales and soil types is a feature of dryland ecosystems that should be considered when designing management plans and determining the response of biocrusts to environmental disturbances.

Citation Information

Publication Year 2013
Title Dryland soil microbial communities display spatial biogeographic patterns associated with soil depth and soil parent material
DOI 10.1111/1574-6941.12143
Authors Blaire Steven, La Verne Gallegos-Graves, Jayne Belnap, Cheryl R. Kuske
Publication Type Article
Publication Subtype Journal Article
Series Title FEMS Microbiology Ecology
Series Number
Index ID 70107088
Record Source USGS Publications Warehouse
USGS Organization Southwest Biological Science Center