[논문]저장 온도 및 기간이 굴참나무와 느티나무 노지묘 및 용기묘의 묘목품질에 미치는 영향

조민석; 양아람; 노남진

doi:10.14578/jkfs.2021.110.3.406

저장 온도 및 기간이 굴참나무와 느티나무 노지묘 및 용기묘의 묘목품질에 미치는 영향
Effects of Refrigerated Storage Temperature and Duration on the Seedling Quality of Bare Root Plants and Container Seedlings of Quercus variabilis and Zelkova serrata 원문보기

한국산림과학회지 = Journal of korean society of forest science, v.110 no.3, 2021년, pp.406 - 418

조민석 (국립산림과학원 산림기술경영연구소) , 양아람 (국립산림과학원 국제산림연구과) , 노남진 (강원대학교 산림과학부)

초록
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연구는 굴참나무와 느티나무 노지묘 및 용기묘를 대상으로 식재 전까지 우수한 묘목품질을 유지하기 위한 최적 묘목 저장 기술을 구명하고자 수행되었다. 저온저장 온도(냉장 2℃, 냉동 -2℃)와 기간(0, 15, 30, 60, 120, 180, 240, 300, 360일)에 따른 묘목의 비구조성탄수화물 함량 및 줄기 함수율과 식재 후 묘목 생존율 및 건중량을 조사·분석하였다. 굴참나무와 느티나무 두 수종 모두 저장 기간이 길어질수록 비구조성탄수화물 함량과 줄기함수율이 감소하였으며, 180~240일 이후 비구조성탄수화물 함량이 급격히 감소하는 것을 확인하였다. 저장 기간이 길어질수록 냉장보다는 냉동 조건이 낮은 감소율을 보였다. 줄기함수율은 두 수종 모두 노지묘보다 용기묘, 냉장보다 냉동 저장 조건에서 감소율이 낮았다. 식재 후 생존율은 두 수종 모두 냉장 저장은 60일, 냉동 저장은 180일 이후 급격히 감소하였다. 비구조성탄수화물 함량이 20 mg g^-1 이하로 감소하면, 굴참나무와 느티나무 모두 60% 이하의 식재 후 묘목 생존율을 보였다. 또한, 저장 전 줄기함수율 기준으로 굴참나무는 약 30%, 느티나무는 약 20% 감소 시 80% 이하의 생존율을 나타냈다. 본 연구 결과, 굴참나무와 느티나무 묘목의 저장 방식으로 2개월 미만의 단기저장은 냉장(1~2℃), 2~6개월 동안의 장기저장은 냉동(-2~-4℃)이 적정한 것으로 판단된다. 향후 조림 전 묘목 수확 및 관리 시스템과 연계하여 적정 묘목 저장 조건의 적용은 우수한 품질의 묘목 생산과 함께 조림 성과 향상을 기대할 수 있을 것이다.

Abstract ▼ AI-Helper

This study was conducted to evaluate optimal storage techniques for bare root plants and container seedlings of Quercus variabilis and Zelkova serrata in order to maintain high quality of seedlings until planting. Refrigerated storage treatments were given at two temperatures (-2℃ [freezing] and 2℃ [cooling]) for nine different durations (0, 15, 30, 60, 120, 180, 240, 300, and 360 days after storage). We analyzed total nonstructural carbohydrate (TNC) content and measured shoot moisture content (SMC) during the storage stage and survival rate (SR) and dry weight during the planting stage of seedlings. The TNC content and SMC of the seedlings of the two species decreased with an increase in storage duration. The TNC content of seedlings rapidly decreased after 180~240 days of storage. The TNC reduction rate in the freezing treatment was lower than that in the cooling treatment. Also, with an increase in the storage duration of the two species, the SMC reduction rate in the cooling treatment increased in comparison with that in the freezing treatment. In both the species, the SR after planting decreased rapidly after 60 days of cooling storage and 180 days of freezing storage, respectively. The SR after planting was less than 60% when the TNC content for both the species dropped below 20 mg g-1. In addition, the SR was lower than 80% when SMC measured before storage decreased by approximately 30% and 20% for Q. variabilis and Z. serrata, respectively. Our results suggest that cooling (1~2℃) storage is recommended for a short-term period (2 months or less), whereas freezing (-2~-4℃) storage is suitable for longer periods (2~6 months). These optimal storage techniques, allied with seedling harvesting and handling systems, will improve the quality of seedling production in nursery stages and increase seedling growth performances in plantations.

주제어

표/그림 (11)

표 Table 1. The initial root collar diameter and height of two deciduous hardwood species seedlings before refrigerated storage treatment.
표 Table 2. The environmental characteristics of growth chamber after seedling planting.
표 Table 3. The results of three-way ANOVA of the stock type, temperature, duration and their interaction effects on total nonstructural carbohydrate and shoot moisture content for two deciduous hardwood species in refrigerated storage.
그림 Figure 1. The total nonstructural carbohydrate (TNC) of two deciduous hardwood species in relation to duration refrigerated storage. Vertical bars represent SD of the mean (n=9). BS: bare-root seedling, CS: container seedling, Freezing: −2℃ storage, Cooling: 2℃ storage.
그림 Figure 2. The total nonstructural carbohydrate (TNC) of two deciduous hardwood species according to stock types (n=162) (A), temperature (n=162) (B) and duration (n=36) (C) of refrigerated storage. Different letters show statistical differences among refrigerated storage treatments at the 5% levels by Duncan’s multiple range test.
그림 Figure 3. The shoot moisture content (SMC) of two deciduous hardwood species in relation to duration refrigerated storage. Vertical bars represent SD of the mean (n=9). BS: bare-root seedling, CS: container seedling, Freezing: −2℃ storage, Cooling: 2℃ storage.
그림 Figure 4. The shoot moisture content (SMC) of two deciduous hardwood species according to stock types (n=162) (A), temperature (n=162) (B) and duration (n=36) (C) of refrigerated storage. Different letters show statistical differences among refrigerated storage treatments at the 5% levels by Duncan’s multiple range test.
표 Table 4. The effect of refrigerated storage treatments on survival rate and dry weight of Z. serrata seedlings after planting.
표 Table 5. The effect of refrigerated storage treatments on survival rate and dry weight of Q. variabilis seedlings after planting.
그림 Figure 5. The relationship between survival rate after planting and total nonstructural carbohydrate (TNC) (A) and shoot moisture content (SMC) (B) of two deciduous hardwood species in refrigerated storage. BS: bare-root seedling, CS: container seedling, Freezing: −2℃ storage, Cooling: 2℃ storage. The dotted line in (A) denotes 20 mg g^-1 of TNC.
그림 Figure 6. The relationship between seedling dry weight after planting and total nonstructural carbohydrate (TNC) (A) and shoot moisture content (SMC) (B) of two deciduous hardwood species in refrigerated storage. BS: bare-root seedling, CS: container seedling, Freezing: −2℃ storage, Cooling: 2℃ storage.

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