Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
권호 표지

Effects of Thinning and Pruning on Net Rainfall and Interception Loss in Abies holophylla

전나무林에서 間伐과 가지치기가 林內雨 및遮斷損失量에 미치는 影響

Kim, Kyong-ha;Jeong, Yong-ho;Jeong, Chang-gi
김경하;정용호;정창기

  • Published : 2003.09.30
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Abstract

This study was can-ied out to clarify the effects of thinning and pruning on net rainfall and interceptionloss at the planted forest of Abies holophylta m Gwangneung, Gyeonggi-do. It aims to supply afundamental results, which need to develop the techniques on forest practices to increase available waterresources in a coniferous forested watershed. The Abies hotothytIa forest had been established in 1976 andpractised from February to July, 1996. Total and net rainfall were monitored during the periods of Juneto October, 2002. Tipping bucket rain gauge recorded total rainfall. ThrouKhfall and stemflow weremeasured by custom-made tipping bucket and CR10X data logger at each lOm x lOm plot at intervals of30 minutes. Interception loss at the thinned plot decreased by 17.6% compared with the unthinned plot becausethroughfall and stemflow produced more in the thinned plot than the unthinned plot. The relationshipsbetween total rainfall and net rainfall or interception loss were linearly in both plots. Changes of foreststructure parameters such as canopy storage capacity after thinning and pruning were analysed to use theregression equations above. Canopy storage capacity at the thinned plot was less than the unthinned plotowing to reduction of crown coverage after thinning. While on the other, proportion of rainfall which isdiverted to stemflow and stem storage capacity showed reversely because DBH of the thinned increasedmore than one of the◎nthinned. P교ameters related in interception loss◎ere analysed다iro닌토h the relativeequations of total rainfall and interception loss. Average evaporative rate from the saturated canopy surfaceof the thinned was two times as much as one of the unthinned but canopy storage capacity and the amountof evaporation during events showed similarly at both plots. % of interception loss reduced at both plotsas total rainfall and input rate of rainfall increased. Coniferous-planted forests should be practised timelyin order to augment available water resources because % of interception loss at the unthmned plot aged26 years old resulted in being as high as 40%.

본 연구는 경기도 광릉시험림 내의 전나무 인공림에서 간벌과 가지치기가 임내우 및 차단손실량에 미치는 영향을 조사하여 앞으로 가용수자원 증진을 위한 침엽수 인공림 시업기술을 개발하는데 필요한 자료를 확보하기 위하여 수행되었다. 본 연구 대상유역인 전나무림은 1976년 조림지로서 1996년 2월부터7월까지 간벌과 가지치기를 실시하였으며 임외강우량과 임내우량은 시업 후 6년이 경과한 2002년 6월부터 10월까지 조사하였다. 임외강우량은 전도형 자기우설량계로 측정하였으며 임내우량은 서로 인접한간벌구와 비간벌구에 lOm x lOm의 표준구를 설정하고 수관통과우량과 수간유하량을 전도형 측정기와CR10X 데이터 로거를 이용하여 30분 단위로 측정하였다. 간벌구는 임내우인 수관통과우량과 수간유하량 모두 비간벌구 보다 많이 발생하여 차단손실량이17.6% 감소하였다. 임외강우량에 대한 임내우량 및 차단손실량의 관계는 두 시험구 모두 직선회귀식으로 나타났으며 이 관계식을 이용하여 간벌과 가지치기에 따른 임분구조변수의 변화를 구하였다. 간벌구는 비간벌구에 비해 수관울폐도의 감소로 수관저류능이 감소한 반면 흥고직경의 증가로 수간유하량 전환률과 수간저류능이 증가하였다. 임외강우량과 차단손실량의 관계식을 이용하여 차단손실량과 관련있는 변수를 분석한 결과 강우기간동안 포화된 수관의 평균 증발률은 비간벌구가 간벌구에 비해 2배 정도 높은 반면 수관저류능과 강우기간 중의 증발량의 합은 비슷한 값을 나타냈다. 차단손실를은 강우량이 많을수록 그리고 강우유입률이 높을수록 감소하였다. 전나무 인공림 26년생의 경우 간벌과 가지치기를 실시하지 않으면 차단손실률이 40%에 이르기 때문에 가용수자원을 늘리기 위해서는 적정시기에 간벌과 가지치기를 실시해야 한다.

Keywords

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