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Implication of Soil Minerals on Formation of Impermeable Layers in Saprolite Surface-Piled Upland Fields at Highland
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 Title & Authors
Implication of Soil Minerals on Formation of Impermeable Layers in Saprolite Surface-Piled Upland Fields at Highland
Zhang, Yongseon; Sonn, Yeon-Kyu; Moon, Yong-Hee; Jung, Kangho; Cho, Hye-Rae; Han, Kyeong-Hwa;
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 Abstract
Farmers in highlands in South Korea pile up 20 to 30 cm of saprolites, mostly granite- or granite-gneiss-weathered materials, on surface of arable lands every three to five years to compensate eroded soil and sometimes to discontinue soil-borne diseases. Immediate increases of infiltration and percolation rates are expected with coarse textured saprolites while soil drainage becomes poorer in a long-term. In this study, we analyzed mineralogical characteristics and micro-morphology of plow pan to investigate processes making impermeable layers. Soil samples were collected from plow pan, usually located at approximately 20 cm soil depth and at the lower part of piled saprolites, in arable lands in Hoenggye 5-ri, Daekwanryeong-myeon, Gangwon-do (N37.7, E128.7) in which saprolites were added 2, 4, and 8 years ago; saprolites were transported from similar areas. The saturated hydraulic conductivity decreased over time. Based on soil thin section pedography, quartz and feldspar accounted for a majority of minerals. The size of feldspar decreased and macropores became filled with clay or silt particles over time, which implies that macropores were packed with particles weathered from feldspar. The X-ray diffraction (XRD) analysis indicated that intensity of feldspar decreased over time and the reverse was true for kaolinite and illite, indicating that feldspar and mica weathering induced formation of kaolinite and illite. Conclusively, deteriorated drainage by formation of impermeable layers in farms with piled saprolites was caused by accumulation of clay minerals such as kaolinite and illite in macropores; illite and kaolinite can be formed by weathering of mica and feldspar, respectively.
 Keywords
Surface-piled saprolite;Soil mineral;Micromorphology;
 Language
Korean
 Cited by
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Physico-chemical Properties of Disturbed Plastic Film House Soils under Cucumber and Grape Cultivation as Affected by Artificial Accumulation History,;;;;;;;

한국토양비료학회지, 2015. vol.48. 2, pp.105-118 crossref(new window)
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Effect of Deep Ploughing with a Spading Machine and an Excavator on Improvement of Physical Properties in the Highland Applied Saprolite,;;;;;;

한국토양비료학회지, 2015. vol.48. 5, pp.564-569 crossref(new window)
1.
Physico-chemical Properties of Disturbed Plastic Film House Soils under Cucumber and Grape Cultivation as Affected by Artificial Accumulation History, Korean Journal of Soil Science and Fertilizer, 2015, 48, 2, 105  crossref(new windwow)
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Effect of Deep Ploughing with a Spading Machine and an Excavator on Improvement of Physical Properties in the Highland Applied Saprolite, Korean Journal of Soil Science and Fertilizer, 2015, 48, 5, 564  crossref(new windwow)
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