Spatial Distribution of Major Soil Types in Korea and an Assessment of Soil Predictability Using Soil Forming Factors

한국 주요 토양유형의 공간적 분포와 토양형성요인을 이용한 예측가능성 평가

  • 박수진 (서울대학교 지리학과) ;
  • 손연규 (농촌진흥청 국립농업과학원) ;
  • 홍석영 (농촌진흥청 국립농업과학원) ;
  • 박찬원 (농촌진흥청 국립농업과학원) ;
  • 장용선 (농촌진흥청 국립농업과학원)
  • Received : 2010.01.25
  • Accepted : 2010.03.13
  • Published : 2010.03.31

Abstract

This study aims to investigate the spatial distribution of major soil types in Korea, and to assess the ability to predict soil distribution using environmental variables. A classification tree method was used to assess soil predictability. While the great soil groups can give more intuitive understandings on their spatial distributions, its predictability using environmental factors is much lower than that of the great groups. The most important factor to determine the spatial distribution of major soil types is the geomorphological characteristic of Korea that shows distinctive morphological difference between mountains and plains. Spatial distribution of climatic variables and catenary soil sequence along slopes play additional roles in determining the distribution of soil types. The classification tree models resulted in 35-75% of prediction accuracy, depends on the combination of different environmental variables brought in the models. While geomorphological variables are the best predictors for the great groups, climatic variables perform better for the great soil groups.

이 연구에서는 현재 한국에서 사용되고 있는 구분류법에 근거한 대토양군과 신분류법에 근거한 대군의 공간적 분포를 살펴보고, 토양형성과 관련된 각종 환경요인들과의 상관관계를 분석하였다. 그 결과를 토대로 의사결정나무기법을 이용하여 토양분포의 예측가능성을 평가하였다. 대토양군의 경우에는 분포를 보다 직관적으로 이해할 수 있는 장점이 있지만, 환경요인을 이용한 예측가능성면에서는 대군에 뒤지는 결과를 보여주었다. 토양분포를 결정하는 요인들로는 산지와 평탄지가 뚜렷하게 구분되는 한국의 지형특성이 가장 중요한 요인으로 나타났으며 부차적으로 기후특성, 그리고 사변을 따라 나타나는 토양연속성이 제시되었다. 의사결정나무기법을 이용한 토양의 예측가능성 평가에서는 예측변수의 수와 종류에 따라 35%에서 75%의 분류정확도를 보여주었다. 신분류법의 경우에는 지형요인이 가장 중요한 예측변수로 평가된 반면, 구분류법의 경우에는 기후변수가 중요한 예측변수로 평가되어 대조를 보였다.

Keywords

Acknowledgement

Supported by : 농촌진흥청

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