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).