종가시나무 인공림의 솎아베기 수준별 가지치기 시업효과
Effect of Pruning Treatment by Thinning Intensity on Tree Growth and Characteristics in a Quercus glauca Thunb. Plantation
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본 연구는 2013년 1차 솎아베기 및 가지치기를 시행한 35년생 종가시나무 인공림을 대상으로 2014년과 2021년에 임분조사를 실시하여 임목생장⋅형질 반응 특성을 분석하였다. 가지치기 시업임분에 대한 솎아베기 강도별 임목생장 특성을 비교 분석한 결과, 평균수관면적은 강도구가대조구보다 유의적으로 넓으며(p<0.05), 정기생장률도 높아 흉고직경과 유사한 경향을 보였다. 가지치기 시업임분에 대한 솎아베기 처리구별 가지발달 특성을 분석한 결과, 약도구를 제외한 모든 처리구의 지하고는 가지치기 처리구에서 대조구보다 유의적으로 높게 분석되었다(p<0.05). 고사지발생률의 경우 가지치기 처리구에서 29.6∼36.7%, 대조구에서 40.0∼53.3%로 각각 나타났다. 활엽수 입목형질등급평가 기준에 따른 연구대상지의형질등급 분석 결과, 1등급 입목의 비율은 가지치기 처리구에서 21.0%, 대조구에서 11.6%로 각각 나타나 유의적인 차이를 보였으며, 이로부터가지치기 시업에 따른 임목형질개선 효과에 대한 실증적 시험연구결과를 도출할 수 있었다.
Abstract
This study comparatively analyzed the tree growth and quality characteristics in 2014 and 2021 for Quercus glauca Thunb. stands of 35 years that were performed the first thinning and pruning in 2013. As the result of analysis for growth by thinning intensity for the pruning experiments, the mean crown area of heavy thinning was significantly wider than that of the unthinned control group (p<0.05), and the periodic growth rate was also higher, showing a similar tendency to the DBH. As the result of analysis for characteristic of branch development by thinning intensity for the pruning stand, in the case of clear length height, the pruning plot was significantly higher than the control plot except for light thinning(p<0.05). It was found that the incidence rate of dead branch was 29.6-36.7% in the pruning group and 40.0-53.3% in the control group. According to the criteria on grading hardwood quality of standing trees reported by NIFoS(2016), the first grade was classified as 21.0% in pruning plot and 11.6% in control plot, it was possible to obtain the results of an empirical test study on the effect of tree characteristic improvement according to the pruning.
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