Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Analysis of Environmental Properties of Paddy Soils with Regard to Seasonal Variation and Farming Methods

농법 및 시기 변화에 따른 논토양의 환경 특성 분석

  • Lee, Tae-Gu (Department of Bioresources & Rural Systems Engineering, Hankyong National University) ;
  • Park, Seong-Jik (Department of Bioresources & Rural Systems Engineering, Hankyong National University) ;
  • Lee, Yong Ho (Ojeong Eco-Resilience Institute, Korea University)
  • 이태구 (한경대학교 지역자원시스템공학과) ;
  • 박성직 (한경대학교 지역자원시스템공학과) ;
  • 이용호 (고려대학교 오정에코리질리언스 연구소)
  • Received : 2017.02.25
  • Accepted : 2017.04.21
  • Published : 2017.06.30
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Abstract

The aim of this study is to investigate the environmental properties of paddy soils depending on farming methods and seasonal variation. The paddy soils in 11 plots of conventional paddy and 24 plots of organic paddy were sampled and analyzed in four season of March, May, August, and October. The obtained data of soil properties were used for statistical analysis. Analysis of variance showed that only $NH_4-N$ and $P_2O_5$ were significantly different depending on farming methods. However, the differences of all soil properties depending on seasonal variation were strongly significant. Principal component analysis also presented that nitrogen and phosphorus concentration in soils were more significantly influenced by seasonal variation than farming method. Electric conductivity in soil was decreased from March to October. Amounts of soil organic matter in August and October were higher than that in March and May. T-N was decreased from March to October. $NH_4-N$ and $NO_3-N$ in the soil of both conventional and organic paddy were higher in May than other seasons. T-P concentration was found to be highest in August, but $P_2O_5$ concentration was lowest in August. It can be concluded that seasonal variation should be considered for analysis and comparison of soil environmental properties.

본 연구에서는 농법 및 시기에 따른 논토양의 화학성을 비교 분석하였다. 이를 위하여 관행논 11개 필지와 유기논 24개 필지에 대하여 3월, 5월, 8월, 10월에 토양 시료 채취 및 분석을 수행하였고, 실험 분석 결과에 대해 통계 분석을 수행하였다. 분산분석 결과 농법에 의한 유의미한 차이가 나타난 항목은 $NH_4-N$와 $P_2O_5$이었지만, 시기에 따른 차이는 모든 항목에서 높은 유의성 있는 차이를 보였다. 주성분 분석 결과 또한 토양내 질소 및 인의 농도는 농법에 의한 영향보다는 시료 채취시기에 따른 영향이 더 크게 나타났다. 토양의 전기전도도는 3월에서 10월로 감에 따라서 값이 증가하였다. 토양 유기물은 3월 및 5월에 비하여 8월과 10월에 높게 나타났다. T-N는 3월에서 10월로 지남에 따라서 감소하는 경향을 나타냈다. $NH_4-N$ 및 $NO_3-N$ 농도는 관행논 및 유기논 모두 5월에 가장 높게 나타났다. T-P 농도는 8월에 가장 높은 값을 나타낸 반면에, $P_2O_5$의 경우에는 8월에 가장 낮은 값을 나타내었다. 본 연구 결과 논토양의 화학적 특성은 농법에 의한 차이보다는 시기에 의한 차이가 더 크게 나타났다. 따라서 토양 환경 특성에 대한 분석 및 비교시 시기에 대한 고려가 반드시 필요한 것으로 판단된다.

Keywords

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