Econ. Environ. Geol. 2005; 38(3): 207-219

Published online June 30, 2005

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Use of Discriminant Analysis to Identify Soil Quality Variation by Land Use

Kyung-Seok Ko*, Jae Gon Kim, Jin-Soo Lee, Tack Hyun Kim, Gyoo Ho Lee, Choon Hee Cho, In Suk Oh and Young Wook Cheong

Geological & Environmental Hazards Division, Korea Institute of Geoscience & Mineral Resources, Daejeon 305-350, Korea

Correspondence to :

Kyung-Seok Ko

kyungsok@kigam.re.kr

Received: March 14, 2005; Accepted: April 21, 2005

Abstract

The physical and chemical characteristics of soils in a small watershed were investigated and the effect of geology and land use on soil quality were examined by using multivariate statistical methods, principal components analysis and discriminant analysis. The soil developed from andesite had finer texture and higher contents of water extractable inorganic components, clay, and mafic minerals than the soil developed from granite. It is considered that the accumulation of salts in the farmland soils indicated by electrical conductivity, contents of cations and anions and pH was caused by fertilizer input during cultivation. The low contents of organic matter in the farmland soils was due to the enhanced oxidation of organic matter by tillage and by the harvest of crops. The contents of inorganic components are increased as following order: upland > orchard > paddy field > forest. The high contents of water soluble SO42? of
paddy soils is due to the oxidation of sulfides mineral formed during the flooding period during the air-dry and extraction. The results of principal components analysis show the difference of soil quality was controlled by geology and land use. PC1 indicate the input of fertilizer, mineral weathering and ion exchange reaction by application of nitrogenous fertilizers. The results of two discriminant analyses using water extractable inorganic components and their ratios by land use were also clearly classified by discriminant function 1 and 2. In discriminant analysis by components, discriminant function 1 indicated the effect of fertilizer application and increased as following order: upland > orchard > paddy field > forest soil. The investigated and predicted data for land use from discriminant analysis showed
similar results. The discriminant analysis can be used as a useful method certifying the change of land use.

Keywords soil characteristic, geology, farmland soil, principal components analysis, discriminant analysis, ion exchange reaction

Article

Econ. Environ. Geol. 2005; 38(3): 207-219

Published online June 30, 2005

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Use of Discriminant Analysis to Identify Soil Quality Variation by Land Use

Kyung-Seok Ko*, Jae Gon Kim, Jin-Soo Lee, Tack Hyun Kim, Gyoo Ho Lee, Choon Hee Cho, In Suk Oh and Young Wook Cheong

Geological & Environmental Hazards Division, Korea Institute of Geoscience & Mineral Resources, Daejeon 305-350, Korea

Correspondence to:

Kyung-Seok Ko

kyungsok@kigam.re.kr

Received: March 14, 2005; Accepted: April 21, 2005

Abstract

The physical and chemical characteristics of soils in a small watershed were investigated and the effect of geology and land use on soil quality were examined by using multivariate statistical methods, principal components analysis and discriminant analysis. The soil developed from andesite had finer texture and higher contents of water extractable inorganic components, clay, and mafic minerals than the soil developed from granite. It is considered that the accumulation of salts in the farmland soils indicated by electrical conductivity, contents of cations and anions and pH was caused by fertilizer input during cultivation. The low contents of organic matter in the farmland soils was due to the enhanced oxidation of organic matter by tillage and by the harvest of crops. The contents of inorganic components are increased as following order: upland > orchard > paddy field > forest. The high contents of water soluble SO42? of
paddy soils is due to the oxidation of sulfides mineral formed during the flooding period during the air-dry and extraction. The results of principal components analysis show the difference of soil quality was controlled by geology and land use. PC1 indicate the input of fertilizer, mineral weathering and ion exchange reaction by application of nitrogenous fertilizers. The results of two discriminant analyses using water extractable inorganic components and their ratios by land use were also clearly classified by discriminant function 1 and 2. In discriminant analysis by components, discriminant function 1 indicated the effect of fertilizer application and increased as following order: upland > orchard > paddy field > forest soil. The investigated and predicted data for land use from discriminant analysis showed
similar results. The discriminant analysis can be used as a useful method certifying the change of land use.

Keywords soil characteristic, geology, farmland soil, principal components analysis, discriminant analysis, ion exchange reaction

    KSEEG
    Apr 30, 2024 Vol.57 No.2, pp. 107~280

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