Research Article

Distribution of Available Silicon of Volcanic Ash Soils in Jeju Island

Table 1

Spearman rank correlation coefficients between the available Si content and the selected chemical properties of analyzed soils.

Total (n = 290)Land useSoil type
Cultivated (n = 195)Uncultivated (n = 95)Andisols (n = 204)Non-Andisols (n = 86)

pH H2O0.4680.5630.3680.5190.834
Organic C−0.017−0.045−0.216−0.116−0.420
Exch. Ca0.3120.4970.1400.2670.643
Exch. Mg0.2620.3920.1020.2540.532
Sio0.4510.3030.8340.6930.102
Alo0.7210.1030.7200.490−0.357
Feo0.2640.1860.3930.409−0.123
Alo + 1/2Feo0.2790.1280.6600.483−0.266
Alp/Alo−0.588−0.652−0.647−0.608−0.617
P retention−0.0060.0930.4430.292−0.225
Allophane0.4270.2830.4430.6700.079

, Significant difference at the 0.05 and 0.01 probability levels, respectively.