식재 묘령과 밀도가 물푸레나무 조림목의 초기 생육 특성에 미치는 영향
Effects of seedling age and planting density on early growth performances of Fraxinus rhynchophylla
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본 연구는 식재 당시 묘령과 식재 밀도 처리에 따른 물푸레나무 조림목의 초기 생육 특성을 연차적으로 분석하였다. 물푸레나무 조림목은 묘령에 따라 유의한 차이를 보였으며, 특히 조림 6년차에는 2년생×5천 그루 식재 처리구에서 가장 우수한 생장 특성(근원경, 수고, 수간재적)을 보였다. 이는 묘목의 크기가 크고 밀식할 경우 수광 경쟁이 유도되어 생장이 촉진된 것으로 판단된다. 식재 밀도에 따른 조림목 생육 특성은 2년생 식재 처리구에서만 조림 6년차에 밀식효과를 확인할 수 있었다. 본 연구에서 제시된 묘령과 식재 밀도에 따른 생육 특성에 대한 정량적 분석자료는 향후 물푸레나무 조림 확대를 위한 양묘-조림이 연계된 적정 시스템과 조림 후 관리 방안을 마련하는 데 중요한 자료로 활용될 것이다.
Abstract
This study investigated effects of seedling age and planting density on early growth performances of Fraxinus rhynchophylla trees. Containerized F. rhynchophylla seedlings (1-year-old and 2-year-old) were planted according to two different planting den- sities (3,000 and 5,000 trees ha-1) in April of 2017 in Gangneung city, Gangwon province, South Korea. Survival rate, root collar diameter (RCD), and height (H) were measured from 2017 to 2022 (except for 2021). H/RCD (H/D) ratio and stem volume were then calculated. It was found that growth performances of F. rhynchophylla trees were only affected by seedling age. In 2022, mean (±standard error) RCD (mm), H (cm), and stem volume (cm3 tree-1) were the highest for 5,000 trees ha-1 of 2-year-old seedlings (at 30.7, 197.3, and 1001.8, respectively). Initial RCD and H showed relationships with stem volume (in 2017 2020). As growth space decreased, planted trees initially showed rapid growth due to light competition. In this study, the optimal seedling age and density of planting for F. rhynchophylla were confirmed and important data were secured for preparing a plan for post-reforestation management including operations of weed removal and young tree tending.
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