Variation partitioning analysis of microbial diversity explained by sample altitude (A), soil geochemistry factors (S) and pH (p). (a) General outline, (b) all functional genes. Each diagram represents the biological variation partitioned into the relative effects of each factor or a combination of factors, in which geometric areas were proportional to the respenctive percentages of explained variation. The edges of the triangle presented the variation explained by each factor alone. The sides of the triangels presented interactions of any two factors, and the middle of the triangles represented interactions of all three factors.
Zhang et al. BMC Microbiology 2013 13:72 doi:10.1186/1471-2180-13-72