It is elemental: soil nutrient stoichiometry drives bacterial diversity

TitleIt is elemental: soil nutrient stoichiometry drives bacterial diversity
Publication TypeJournal Article
Year of Publication2017
AuthorsDelgado-Baquerizo M, Reich PB, Khachane AN, Campbell CD, Thomas N, Freitag TE, Abu Al-Soud W, Sorensen S, Bardgett RD, Singh BK
JournalEnvironmental Microbiology
Volume19
Pagination1176-1188
Date PublishedMar
Type of ArticleArticle
ISBN Number1462-2912
Accession NumberWOS:000397525100028
Keywordsbelow-ground biodiversity, carbon, climate, communities, life, microbial diversity, Microbiology, organic-matter, patterns, Plant diversity, terrestrial ecosystems
Abstract

It is well established that resource quantity and elemental stoichiometry play major roles in shaping below and aboveground plant biodiversity, but their importance for shaping microbial diversity in soil remains unclear. Here, we used statistical modeling on a regional database covering 179 locations and six ecosystem types across Scotland to evaluate the roles of total carbon (C), nitrogen (N) and phosphorus (P) availabilities and ratios, together with land use, climate and biotic and abiotic factors, in determining regional scale patterns of soil bacterial diversity. We found that bacterial diversity and composition were primarily driven by variation in soil resource stoichiometry (total C:N:P ratios), itself linked to different land uses, and secondarily driven by other important biodiversity drivers such as climate, soil spatial heterogeneity, soil pH, root influence (plant-soil microbe interactions) and microbial biomass (soil microbe-microbe interactions). In aggregate, these findings provide evidence that nutrient stoichiometry is a strong predictor of bacterial diversity and composition at a regional scale.

Alternate JournalEnviron. Microbiol.