Differences of Nitrogen Mineralization in Larix decidua, Pinus strobus and Thuja occidentalis Plantations of the Kwangeneung Experimental Forest, Kyonggi Province

경기도 광릉시험림의 구주낙엽송, 스트로브잣나무, 서양측백 조림지 토양내 질소 무기화 비교

  • Son, Yowhan (Department of Forest Resources, Korea University) ;
  • Im-Kyun Lee (Department of Forest Resources, Korea University) ;
  • Jung-Tae Kim (Department of Agronomy, Ansung University) ;
  • Sang-Eun Lee (Department of Agronomy, Ansung University)
  • Published : 1995.06.01

Abstract

Species effects on soil nitrogen mineralization and nitrification in the top 15 cm of soil were evaluated using the buried-bag incubation method in three coniferous plantations in the Kwangneung Experimental Forest, Kyonggi Province. The plantations were established on a similar soil in 1927, and included Larix decidua, Pinus strobus, and Thuja occidentalis. Ten soil samples within each plantation were taken during an entire growing season (May 2~Oct. 30, 1994). Mean daily nitrogen mineralization rates during 45-day in situ soil incubations were significantly different among species and incubation dates. Growing season nitrogen mineralization also differed significantly among species and ranged from 47.7 mg N/kg soil for Larix decidua to 21.5 ma N/kg soil for Thuja occidentalis. Growing season nitrification differed significantly among species and comprised from 93% to 100% of the total growing season nitrogen mineralized. We speculated that organic matter contents and quality might control nitrogen mineralization and nitrification in these soils.

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