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Effect of Planting Density on Early Growth Performances of Zelkova serrata Trees

식재밀도가 느티나무 조림목의 초기 생육에 미치는 영향

  • Noh, Nam Jin (Forest Technology and Management Research Center, National Institute of Forest Science) ;
  • Kwon, Boram (Forest Technology and Management Research Center, National Institute of Forest Science) ;
  • Yang, A-Ram (Division of Global Forestry, National Institute of Forest Science) ;
  • Cho, Min Seok (Forest Technology and Management Research Center, National Institute of Forest Science)
  • 노남진 (국립산림과학원 산림기술경영연구소) ;
  • 권보람 (국립산림과학원 산림기술경영연구소) ;
  • 양아람 (국립산림과학원 국제산림연구과) ;
  • 조민석 (국립산림과학원 산림기술경영연구소)
  • Received : 2020.08.05
  • Accepted : 2020.08.26
  • Published : 2020.09.30

Abstract

The purpose of this study was to determine the optimal planting density for Zelokva serrata plantations. The study sites were located in Gyeongsan (GS) and Sunchang (SC), Korea. One-year-old, bare-root seedlings were planted at densities of 3,000; 5,000; 7,000; and 10,000 trees ha-1 at the end of March 2015. We measured the root collar diameter and height each September from 2015 to 2019, and then calculated the H/D ratio and stem volume. The root collar diameter and height increased with increased planting density, and the stem volume was significantly higher at 10,000 trees ha-1 than those at the other planting densities. Planting density did not affect the survival rate or H/D ratio. The root collar diameter, height, and stem volume were higher in GS than those in SC five years after planting. This study highlights that early growth performance was improved at increased planting densities at both sites. This study suggests that the initial planting density of 10,000 trees ha-1 is suitable to improve the early growth performance of Z. serrata plantations, and that the improved growth performance at higher planting densities may be a silvicultural characteristic of Z. serrata.

본 연구는 식재밀도가 느티나무 조림목의 초기 생장에 미치는 영향을 구명하고자 수행되었다. 연구지는 경북 경산과 전북 순창이며, 2015년 3월 말 느티나무 노지묘(1-0)를 4처리 밀도(3천, 5천, 7천, 10천본 ha-1)로 식재하였다. 2019년까지 매년 9월에 조림목의 근원경과 수고를 측정하였고, H/D율과 수간 재적을 계산하였다. 모든 조사지에서 식재밀도가 증가할수록 근원경 및 수고 생장이 높아지는 경향을 보였으며, 수간 재적은 10천본 ha-1 처리구에서 가장 높게 나타났다. 그러나 생존율과 H/D율은 식재밀도에 따른 차이가 없었다. 식재후 5년차에, 경산 지역에서의 근원경, 수고, 수간 재적은 순창 지역에서보다 높게 나타났다. 그러나, 입지 환경이 다른 두 조사지 모두에서 식재밀도 증가에 따라 조림목의 초기 생장이 향상되는 동일한 경향을 확인할 수 있었다. 본 연구는 10천본 ha-1의 식재밀도가 느티나무 조림목의 초기 생장을 향상시키기 위한 적정 식재밀도임 확인하였으며, 느티나무의 조림학적 특성으로서 밀식처리에 의해 초기 생장이 향상될 수 있다는 점을 제안한다.

Keywords

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