The Korean Journal of Ecology

The Ecological Society of Korea (한국생태학회)
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Effects of Nitrogen and Phosphorus Fertilization on Seasonal Changes and Retranslocation of Nutrition in Foliage and Twig of Pinus rigida and Larix kaempferi

질소와 인 시비가 리기다소나무와 낙엽송 침엽 및 소지에서의 부위별 양분의 계절적 변화 및 재분배에 미치는 영향

  • 이임균 (국립산림과학원 산림환경부) ;
  • 손요환 (고려대학교 환경생태공학부)
  • Published : 2004.08.01
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Abstract

Effects of nitrogen and phosphorus fertilization on seasonal changes of nutrient content in tree components, and retranslocation N and P in foliage and twig were determined in adjacent 41-year-old plantations of Pinus rigida Miller and Larix kaempferi Gordon on a similar soil in Yangpyeong, Gyeonggi Province. In general, foliage N and P concentrations of L kaempferi were significantly higher than current and 1-year-old foliages of P. rigida. N and P concentrations were higher in foliage than in twigs for both tree species. However, there were no significant differences in foliage and twig N and P concentrations with ages. Significant seasonal differences in foliage and twig N and P concentrations were observed for both tree species because of nutrient retranslocation. Foliage nutrient concentrations were highest in the mid-growing season and lowest in autumn, whereas twig nutrient concnetrations have gradually increased since July. These seasonal trends indicated nutrient retranslocation from foliage into twigs before foliage senescence. However, there were no significant changes in foliage and twig nutrient retranslocation, and no consistent patterns in foliage and twig nutrient retranslocation following N and P fertilizer additions. No significant changes in nutrient retranslocation between different foliage and twig ages were observed following fertilization.

본 연구는 경기도 양평지역 내 서로 인접하여 있고 동일한 입지환경 위에 생육하고 있는 41년생 리기다소나무와 낙엽송 조림지를 대상으로 질소와 인 시비처리가 리기다소나무와 낙엽송 침엽 및 소지에서의 부위별 양분의 계절적 변화 및 양분 재분배에 미치는 영향을 구명하기 위하여 수행되었다. 엽내 질소와 인 농도는 낙엽송이 리기다소나무 당년생과 1년생 엽보다 모두 높은 것으로 나타났다. 또한 두 수종 모두 질소와 인 농도는 소지보다 침엽에서 더 높았던 것으로 나타났으나 엽령 증가에 따른 침엽과 소지에서의 질소와 인 농도의 차이는 나타나지 않았다. 엽과 소지에서의 질소와 인 농도의 계절적인 차이는 두 수종 모두 통계적으로 유의성이 인정되었다. 두 수종의 침엽내 양분의 농도는 임목 생장기에 농도가 가장 높았고 가을철엔 가장 낮아진 반면, 소지내 양분농도는 7월 이후 점차적으로 증가되는 경향을 나타내었다 이러한 계절적 경향은 두 수종 모두 가을철 낙엽기에 침엽으로부터 소지로 양분이 이동되어 축적되는 현상을 나타내는 양분의 재분배현상에 기인하는 것으로 판단된다. 그러나 수종별로 양분 이용효율을 나타낼 수 있는 양분 재분배율은 본 연구 결과만으로 보면 상록성 침엽수인 리기다소나무와 낙엽성 침엽수인 낙엽송간에 차이가 없어 잎의 행태와 양분이용효율간의 관계를 단정하기는 어려웠다. 또한 시비처리 후 침엽과 소지의 양분 재분배율 변화도 일정 한 경향을 나타내지 않아 임지의 비옥도와 양분 재분배율의 관계가 명확하지 않았다.

Keywords

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