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Determinants of bacterial communities in C anadian agroforestry systems
Author(s) -
Banerjee Samiran,
BaahAcheamfour Mark,
Carlyle Cameron N.,
Bissett Andrew,
Richardson Alan E.,
Siddique Tariq,
Bork Edward W.,
Chang Scott X.
Publication year - 2016
Publication title -
environmental microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.954
H-Index - 188
eISSN - 1462-2920
pISSN - 1462-2912
DOI - 10.1111/1462-2920.12986
Subject(s) - edaphic , acidobacteria , biology , agroforestry , ecology , actinobacteria , soil water , genetics , 16s ribosomal rna , bacteria
Summary Land‐use change is one of the most important factors influencing soil microbial communities, which play a pivotal role in most biogeochemical and ecological processes. Using agroforestry systems as a model, this study examined the effects of land uses and edaphic properties on bacterial communities in three agroforestry types covering a 270 km soil‐climate gradient in A lberta, C anada. Our results demonstrate that land‐use patterns exert stronger effects on soil bacterial communities than soil zones in these agroforestry systems. Plots with trees in agroforestry systems promoted greater bacterial abundance and to some extent species richness, which was associated with more nutrient‐rich soil resources. While A cidobacteria , A ctinobacteria and A lphaproteobacteria were the dominant bacterial phyla and subphyla across land uses, A rthrobacter , A cidobacteria_ G p16 , B urkholderia , R hodanobacter and R hizobium were the keystone taxa in these agroforestry systems. Soil pH and carbon contents emerged as the major determinants of bacterial community characteristics. We found non‐random co‐occurrence and modular patterns of soil bacterial communities, and these patterns were controlled by edaphic factors and not their taxonomy. Overall, this study highlights the drivers and co‐occurrence patterns of soil microbial communities in agroforestry systems.