3.3 Relationships of root and foliar nutrients with soil exploration types
Root P concentration was positively related to the colonization ratio of CE with an exponential relationship (R2=0.73, P< 0.01; Figure 5a). Root P and N concentrations were negatively related to the colonization ratio of SDE with a linear (R2=0.57, P < 0.05; Figure 5b) and exponential relationships (R2=0.65 P< 0.001; Figure 5c), respectively. As shown in Figure 5d, it suggested that root P varied with the colonization ratio of MDE in a curve relationship, and increased firstly with the increase of the colonization ratio of MDE, then decreased with the increase of MDE. Root N:P ratio decreased with the increase of the colonization ratio of MDE (R2=0.52, P < 0.05; Figure 5e). As to foliar nutrient variables, foliar N:P was decreased with the colonization ratio of MDE in less than 20%, yet increased with that of MDE when over 20% (R2=0.56, P < 0.09; Figure 5f).