Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
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Effects of Artificially Acidified Soils on the Growth and Nutrient Status of Pinus densiflora and Quercus acutissima Seedlings

토양산성화가 소나무, 상수리나무 묘목의 생장 및 영양상태에 미치는 영향

  • Jin, Hyun-O (College of Life Science, Kyunghee University) ;
  • Bang, Sun-Hee (College of Life Science, Kyunghee University) ;
  • Lee, Choong-Hwa (Department of Forest Environment, Korea Forest Research Institute) ;
  • Kim, Se-young (College of Life Science, Kyunghee University)
  • 진현오 (경희대학교 생명과학대학) ;
  • 방선희 (경희대학교 생명과학대학) ;
  • 이충화 (국립산림과학원 산림환경부) ;
  • 김세영 (경희대학교 생명과학대학)
  • Received : 2008.03.24
  • Accepted : 2008.04.23
  • Published : 2008.06.29
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Abstract

The effects of soil acidification on the seedling growth and nutrition of Pinus densiflora and Quercus acutissima were investigated. The relationship between the seedling growth and molar (Ca+Mg+K)/Al ratio of in soil solution was examined. The results suggested that growth inhibition of seedling Pinus densiflora and Quercus acutissima was due to the low pH of soil solution, which was followed by leach of Al into soil solution, and decrease of essential elements, such as Ca in aerial pant of the seeding caused by the increase of Al concentration in subterranean pant of the seedlings. The level of growth inhibition was determined not only by Al concentration, but also by the balance of inorganic elements, Al, Ca, Mg and K. The growths of two species in total dry weight were clearly inhibited when molar (Ca+Mg+K)/Al ratio of the soil was lower than 6.0. The growth in dry weight, in the condition of the molar ratio was 0.8, was decreased 60% or 50% for the seedling of Pinus densiflora or Quercus acutissima respectively. It was concluded that the molar (Ca+Mg+K)/ Al ratio could be an important index for evaluation of the effects of soil acidification, due to acid deposition such as acid rain, on growth of trees and nutrition. And it might be a more useful indicator for evaluation of critical load of acid deposition on forest ecosystems.

소나무, 상수리나무 묘목의 생장 및 영양상태에 미치는 토양산성화의 영향을 조사하고 묘목의 생장과 토양용액 중의 (Ca+Mg+K)/Al 몰비와의 관계를 검토하였다. 인위적으로 산성화 시킨 산림토양에서 생육한 소나무, 상수리나무 묘목의 생장저해에는 토양용액 중의 pH 저하와 이에 따른 토양용액으로의 Al 용출 및 묘목의 지하부에 있어서 Al 농도의 증가에 따른 지상부의 Ca 등의 식물 필수원소의 감소 등이 관여하고 있음을 시사하였다. 토양산성화에 따른 묘목의 생장저하 수준은 토양의 Al 농도뿐만 아니라 Al과 Ca, Mg 및 K과의 무기영양소 균형도에 의해 결정되며, 두 수종 모두 토양용액 중의 (Ca+Mg+K)/Al 몰비가 6.0 이하가 되면 건물생장이 현저하게 저하하고 그 비가 0.8인 경우 건물생장이 대조구 값에 비하여 소나무 묘목에서 약 60%, 상수리나무 묘목에서 약 50% 저하하였다. 앞으로, 산성우 등의 산성강하물에 의한 토양산성화가 수목의 생장 및 영양상태에 미치는 영향을 평가할 경우, 토양용액 중의 (Ca+Mg+K)/Al 몰비는 삼림생태계 피해예측에 대한 산성강하물의 한계부하량의 평가에 있어 중요한 지표가 될 수 있다고 판단된다.

Keywords

Acknowledgement

Supported by : 경희대학교

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