Summary of relationships^a between agronomic, soil and environmental factors and AMF communities assessed by T-RFLP analysis.

aCorrelations with all environmental variables (r2) were obtained by fitting linear trends to the NMDS ordination obtained with each restriction enzyme and significance (P) was determined by permutation (nperm = 1000). ‘***’ = P<0.001; ‘**’ = P<0.01; ‘*’ = P<0.05. Variables with highest significant weight are shown in bold. bOrchard agronomic and climatic characteristics, and soil physicochemical properties are shown in Table S1 and some of them were reported before [5], [14]. Climatic variables were obtained from SigMapa, Geographic Information System from the Spanish Ministry of “Medio Ambiente y Medio Rural y Marino” (http://sig.mapa.es/geoportal/) using ArcGIS 10 (ESRI, Redlands, California, EE.UU.).