시비처리에 따른 2년생 편백나무 용기묘의 내건성 반응특성 = Drought Resistance Characteristics of 2-years Old Chamaecyparis obtusa Container Seedlings According to Fertilization Treatment

다국어 초록 (Multilingual Abstract)

The main aim of this study is first to measure changes in the growth of 2-year-oldChamaecyparis obtusa containerized seedlings as influenced by fertilizer treatments and throughwater resistance measurement by water supply cut-off, second to establish a proper fertilizationplan for the promotion of drought resistance, and finally to provide basic data for healthyseeding production. For fertilization treatments, the height growth of C. obtusa seedlings was26.96±0.87 cm at a weak (1.0 g/L) fertilizer treatment, while the diameter growth of root collarwas 4.76±0.18 mm at an intermediate (2.0 g/L) fertilizer treatment (p<0.0001). Furthermore, thequality index of seedling was 0.83 at an intermediate (2.0 g/L) fertilizer treatment, which is thehighest one, while total chlorophyll content was 16.19 mg/g at a weak (1.0 g/L) fertilizertreatment. For the abscisic acid content of C. obtusa seedlings for each fertilizer treatmentduring water supply cut-off, the lowest abscisic acid content of 3671.70 ng/g was found at an intermediate (2.0 g/L) fertilizer treatment. Exceptionally, seedlings with strong (3.0 g/L) fertilizertreatment showed poor growth, caused by damaged leaves due to the excessive fertilizertreatment. Furthermore, the highest total chlorophyll content of 15.12 mg/g was observed at anintermediate (2.0 g/L) fertilizer treatment due to less effect of drought stress on chlorophyll. Wethus found the lowest abscisic acid content and the highest chlorophyll content of C. obtusaseedlings during water cutoff or drought stress at the intermediate (2.0 g/L) fertilizer treatment.
The results suggested that the appropriate fertilizer treatment for improving the droughtresistance of C. obtusa seedlings is the intermediate (2.0 g/L) level.

국문 초록 (Abstract)

본 연구는 편백나무 2-0 용기묘를 대상으로 시비처리에 따른 생장변화와 시비처리 후 단수처리에따른 내건성 측정을 통해 내건성 증진을 위한 적정시비 방안을 수립하여 건강한 묘목 생산을 위한 기초자료를 제공하고자 수행되었다. 시비처리에 따른 편백나무 묘목은 약도(1.0 g/L) 시비구에서 묘고생장량(26.96±0.87 cm)을 나타냈으며, 근원경 생장은 중도(2.0 g/L)의 시비구에서 가장 높은 생장량(4.76±0.18 mm)을 나타내어 다른 처리구보다 유의적으로 높게 나타났다(p<0.0001). 묘목품질지수(SQI)는 중도(2.0 g/L)의 시비구에서 0.83으로 가장 높게 나타났다. 전체 엽록소 함량은 약도(1.0 g/L)의 시비구에서 16.19 mg/g으로 가장 높게 나타났다. 단수처리에 따른 시비구별 편백나무 묘목의 ABA함량은 과시비로 인해 엽 피해가 발생하여 생육이 건전하지 못한 강도(3.0 g/L)의 시비구를 제외하면중도(2.0 g/L)의 시비구에서 가장 낮은 ABA 함량 값(3671.70 ng/g)을 나타냈고, 전체 엽록소 함량은중도(2.0 g/L)의 시비구에서 건조스트레스에 따른 엽록소의 파괴가 적어 가장 높은 엽록소 함량 값(15.12 mg/g)을 나타냈다. 따라서 편백나무는 중도(2.0 g/L)의 시비구에서 건조스트레스에 따른 ABA의 함량이 가장 적고, 엽록소의 함량은 가장 높게 나타나 편백나무의 내건성 증진을 위한 적정 시비수준은 중도(2.0 g/L)라고 판단된다.

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