간벌강도가 편백림의 낙엽낙지 분해에 미치는 효과

김현준1*

(1전남대학교 산림자원학과)

Effects of Thinning Intensity on Litterfall Decomposition

in Chamaecyparis obtusa Forests

Hyun-Jun Kim1*

(1Department of Forest Resources, Chonnam National University)

요약: 본 연구는 간벌강도에 따른 편백림 내 낙엽낙지의 분해율을 분석하고자 실시하였다. 시험지는 1976년에 전북 고창에 조성되었으며, 5개의 처리구로 구성되어 있다. 간벌은 2000년에 실시하였으며, 간벌율은 약도간벌구(LT)는 30%, 적정간벌구(NT)는 40%, 강도간벌구(HT)는 50%, 극강도간벌구(SHT)는 60%로 실시하였다. 각각 5g의 잎과 가지를 넣은 낙엽봉투는 조사구별로 3 set씩 2019년 2월에 설치하였다. 2019년 5월과 8월, 2020년 2월과 8월에 시료를 채취하여 잔류량을 측정하였다. 잎의 잔류량은 설치 18개월 이후에 Control에서 33%, LT에서 29%, NT에서 20%, HT에서 21%, SHT에서 19%로 나타났으며, NT, HT, SHT에서 통계적 유의성이 나타났다(P < 0.01). 잎의 분해상수는 역시 NT(1.28), HT(1.23), SHT(1.24)에서 Control(0.83)보다 유의하게 높게 나타나 40% 이상의 간벌은 잎의 분해속도를 촉진시키는 것으로 판단된다. 한편, 가지의 잔류량은 설치 18개월 이후에 Control에서 64%, LT에서 66%, NT에서 60%, HT에서 62%, SHT에서 66%로 나타났다. 분해상수는 Control(0.33)과 비교하여 모든 처리구에서 유의한 차이를 보이지 않아 간벌의 효과가 나타나지 않았다.

Abstract: This study was conducted to analyze the decomposition rate of fallen leaves and branches in Chamaecyparis obtusa forest according to the thinning intensity. The study site was established in Gochang, Jeonbuk province in 1976 and consists of 5 treatment zones. Thinning was carried out in 2000, and the thinning rate was 30% for light thinning (LT), 40% for normal thinning (NT), 50% for heavy thinning (HT), and 60% for super-heavy thinning (SHT). Three sets of litter bags each containing 5 g of leaves and branches were installed in February 2019. Samples were collected in May and August 2019, and February and August 2020, and the remaining mass was measured. After 18 months of observation, the remaining mass of leaves was 33% in Control, 29% in LT, 20% in NT, 21% in HT, and 19% in SHT, and statistical significance was shown in NT, HT, and SHT (P < 0.01). The decomposition constant of leaves was also significantly higher than Control (0.83) in NT (1.28), HT (1.23), and SHT (1.24). it is believed that thinning more than 40% accelerates the decomposition rate of leaves. Meanwhile, after 18 months of installation, the remaining mass of branches was 64% in Control, 66% in LT, 60% in NT, 62% in HT, and 66% in SHT. The decomposition constant did not show a significant difference in all treatments compared to Control (0.33), so the effect of thinning was not observed.

사사: 본 연구는 한국연구재단(NRF-2018RIDIAIB07042483)의 지원에 의해 이루어진 것임.