시비처리에 따른 소나무의 내건성 반응특성 연구
Drought resistance characteristics of Pinus densiflora seedlings according to fertilization treatment
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본 연구는 소나무 2-0 용기묘를 대상으로 시비처리에 따른 생장변화와 시비처리 후 단수처리에 따른 생리활성 측정을 통해 내건성 증진을 위한 적정시비 방안을 수립하여 건강한 묘목 생산을 위한 기초자료를 제공하고자 수행되었다. 시비처리에 따른 소나무 묘목은 중도(2.0g/ℓ)의 시비구에서 가장 높은 묘고 생장량(12.34±0.73㎝)을 나타냈으며 근원경 생장은 약도(1.0g/ℓ)의 시비구에서 가장 높은 생장량(5.77±0.20㎜)을 나타냈다. 묘목의 품질을 평가하는 종합적 지수인 묘목품질지수(SQI)는 약도(1.0g/ℓ)의 시비구에서 2.05±0.07로 가장 높게 나타났으며, 중도(2.0g/ℓ)의 시비처리구에서는 1.90±0.09의 값을 보였다. 전체 엽록소 함량은 시비 농도가 높아짐에 따라 증가하는 경향을 보였고 강도(3.0g/ℓ)의 시비구에서 22.50±0.28㎎/g으로 가장 높게 나타났다. 단수처리에 따른 시비구별 소나무 묘목의 아브시스산 함량은 엽 피해가 발생한 강도(3.0g/ℓ)의 시비구를 제외하면 중도(2.0g/ℓ)의 시비구에서 2,190.85ng/g로 가장 낮게 나타났고, 전체 엽록소 함량은 중도(2.0g/ℓ)의 시비구에서 건조스트레스에 따른 엽록소의 파괴가 거의 없이, 단수처리 기간 동안 꾸준히 가장 높은 엽록소 함량 값(21.20±0.20㎎/g)을 나타냈다. 공시 수종인 소나무는 중도(2.0g/ℓ)의 시비구에서 건조스트레스에 따른 아브시스산의 함량이 가장 적고, 엽록소의 함량은 가장 높게 나타나 소나무의 내건성 증진을 위한 적정 시비수준은 중도(2.0g/ℓ)라고 판단된다
Abstract
The main aim of this study is first to measure changes in the growth of 2-year-old Pinus densiflora containerized seedlings as influenced by fertilizer treatments and water supply cut-off proxy of drought resistance, second to establish a proper fertilization plan for the promotion of drought resistance, and finally to provide basic data for healthy seeding production. For the fertilization treatments, the height growth of P. densiflora seedlings was 12.34±0.73cm at an intermediate (2.0g/ℓ) fertilizer treatment, while the diameter growth of root collar was 5.77±0.20mm at a weak (1.0g/ℓ) fertilizer treatment. The highest seedling quality index of 2.05±0.07 was shown at a weak (1.0g/ℓ) fertilizer treatment. The total chlorophyll content increased as the fertilizer concentration increased, and the highest total chlorophyll content of 22.50±0.28 ㎎/g was observed at a strong (3.0g/ℓ) fertilizer treatment and fallowed total chlorophyll content of 1.90±0.09 ㎎/g was found at an intermediate (2.0g/ℓ) fertilizer treatment. For the abscisic acid content of P. densiflora seedlings for each fertilizer treatment during water supply cut-off, the lowest abscisic acid content of 2,190.85ng/g was found at an intermediate (2.0g/ℓ) fertilizer treatment. Exceptionally, seedlings with strong (3.0g/ℓ) fertilizer treatment showed poor growth evident by damaged leaves. Besides, the highest total chlorophyll content of (21.20±0.20㎎/g) was found at an intermediate (2.0g/ℓ) fertilizer treatment constantly during the period of water supply cut-off without destruction of chlorophyll by the drought stress. In conclusion, P. densiflora seedlings showed the lowest abscisic acid content and the highest chlorophyll content during water cut-off or drought stress at the intermediate (2.0g/ℓ) fertilizer treatment. The results suggested that the appropriate fertilizer treatment for improving the drought resistance of P. densiflora seedlings is the intermediate (2.0g/ℓ) level.
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