Table 4.

Variables identified as contributing to the variation in species dispersions across the OTU groupings (+) using CCA and forward/backward selection to identify the best fitting models.

Environmental variable	AM fungi	Insect Pathogens	Rare	Abundant	Core	All	Total Significant OTU Groupings
CEC-Ca%	+			+			2
%Clay				+	+	+	3
%Sand			+	+			2
%Silt		+					1
Cu		+	+	+			3
EC			+				1
OM			+		+		2
P		+	+		+	+	4
pH			+	+			2
POX-C			+		+	+	3
S		+					1
Zn		+				+	2
Total Significant Contributors	1	5	7	5	4	4

EC = electrical conductivity. OM = organic matter.

CEC, CEC-Mg, CEC-K, Ca, K, Mg, NH₄⁺, NO₃⁻, gravimetric water content, and matric potential were removed from the table because there were no groups that were significantly impacted by these variables.