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 use | Soil type | Cultivated (n = 195) | Uncultivated (n = 95) | Andisols (n = 204) | Non-Andisols (n = 86) |
| pH H2O | 0.468 | 0.563 | 0.368 | 0.519 | 0.834 | Organic C | −0.017 | −0.045 | −0.216 | −0.116 | −0.420 | Exch. Ca | 0.312 | 0.497 | 0.140 | 0.267 | 0.643 | Exch. Mg | 0.262 | 0.392 | 0.102 | 0.254 | 0.532 | Sio | 0.451 | 0.303 | 0.834 | 0.693 | 0.102 | Alo | 0.721 | 0.103 | 0.720 | 0.490 | −0.357 | Feo | 0.264 | 0.186 | 0.393 | 0.409 | −0.123 | Alo + 1/2Feo | 0.279 | 0.128 | 0.660 | 0.483 | −0.266 | Alp/Alo | −0.588 | −0.652 | −0.647 | −0.608 | −0.617 | P retention | −0.006 | 0.093 | 0.443 | 0.292 | −0.225 | Allophane | 0.427 | 0.283 | 0.443 | 0.670 | 0.079 |
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, Significant difference at the 0.05 and 0.01 probability levels, respectively. |