Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
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Early Growth Performance of Zelkova serrata Trees According to Seedling Age and Planting Density

묘령 및 식재밀도에 따른 느티나무 조림목의 초기 생육 특성

  • Noh, Nam Jin (Forest Technology and Management Research Center, National Institute of Forest Science) ;
  • Cho, Min Seok (Forest Technology and Management Research Center, National Institute of Forest Science)
  • 노남진 (국립산림과학원 산림기술경영연구소) ;
  • 조민석 (국립산림과학원 산림기술경영연구소)
  • Received : 2020.10.20
  • Accepted : 2020.11.19
  • Published : 2020.12.31
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Abstract

We investigated the effect of seedling age and planting density on early growth performance of Zelkova serrata trees. Containerized Z. serrata seedlings, 1-year-old and 2-year-old, were planted according to two different planting densities (3,000 and 5,000 trees ha-1) at the end of March, 2017. Three plots were established for each treatment (2 seedling ages × 2 planting densities). We calculated the survival rate (%) of out-planted seedlings as well as the stem volume based on the root collar diameter (RCD) and height (H) in September of each year, from 2017 to 2019. Seedling age and planting density did not affect survival rate of the out-planted trees. Planting density did not affect height of the trees, whereas the treatment significantly affected RCD and the H/D ratio for 2-year-old seedlings in 2019. The stem volume per tree was highest in the plot of 2-year-old seedlings at 5,000 trees ha-1 and lowest in the 1-year-old seedlings at 3,000 trees ha-1. In addition, the tree height in both 1-year-old and 2-year-old Z. serrata trees was greater in the 5,000 trees ha-1 plot than in the 3,000 trees ha-1 plot. There was no interactive effect between seedling age and planting density on stem volume; however, as seedling age and planting density increased, stem volume of Z. serrata trees increased. The values for stem volume per hectare are 85%, 68%, and 300% higher in 1-year-old 5,000 trees ha-1, 2-year-old 3,000 trees ha-1, and 2-year-old 5,000 trees ha-1 plots, respectively, compared to the values in 1-year-old 3,000 trees ha-1. This result shows that high planting density (close planting) affects tree growth differently based on seedling age, and suggests that the planting density of 5,000 trees ha-1 is suitable for 2-year-old seedlings to improve early growth field performance.

본 연구는 조림목 묘령과 식재밀도가 느티나무 조림목의 초기 생육 특성에 미치는 영향을 알아보고자 수행되었다. 2017년 3월말에 온대 남부지역인 영덕지역 2 ha 면적에 묘령[용기묘(1-0), 용기묘(2-0)] × 식재밀도(3,000본 ha-1, 5,000본 ha-1) 4가지 조합으로 느티나무 묘목을 식재하였다. 각 처리별 3개의 조사구를 설치하였고, 조림목의 근원경과 수고 생장을 매년 9월마다 3년 동안(2017-2019년) 측정하여 수간 재적을 계산하였다. 느티나무의 초기생존율은 처리간에 차이를 나타내지 않았다. 수고는 묘령(1-0)과 묘령(2-0)에서 밀식처리의 효과가 나타나지 않았으나, 근원경과 H/D율은 묘령(2-0)에서 식재 후 3년차에 밀식처리 효과가 나타났다. 개체목당 수간재적은 묘령(2-0) 5,000본 ha-1 처리구에서 가장 높았으며, 묘령(1-0) 3,000본 ha-1 처리구에서 가장 낮았다. 수간재적은 묘령과 식재밀도 간에 상호작용 효과는 없었고, 묘령과 식재밀도가 높을수록 높은 수간재적을 보였다. 단위면적당 수간 재적은 용기묘(1-0) 3,000본 ha-1 대비 용기묘(1-0) 5,000본 ha-1는 85%, 용기묘(2-0) 3,000본 ha-1와 5,000본 ha-1는 각각 약 68%, 300% 향상되었다. 본 연구는 식재밀도가 묘령에 따라 생장에 다르게 영향을 미친다는 것을 보여주며, 용기묘(2-0)의 초기 생장을 향상시키는데 5,000본 ha-1 처리가 적합하다는 것을 제안한다.

Keywords

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