Study on Rainfall Interception Loss from Canopy in Forest(I)

삼림(森林)에서 임관(林冠)에 의한 강우차단(降雨遮斷) 손실(損失)에 관(關)한 연구(硏究)(I)

To investigate the effects of forest stand and stony characteristics on interception loss from canopy trees, throughfall and stemflow under the canopy of a pine stand and a hardwood stand were measured during 4-month periods July to October, 1986 at the Kwanak Arboretum near Anyang, and the data were analysed by correlation and regression methods. The man results obtained from this study are summerized as follows : 1. The overall throughfall collected during measurement period were 593.5mm(76.7%) in the pine stand and 663.1mm(81.8%) in the hardwood stand oui of total percipitation of 773.8mm. Combined regression analysis describes the relation between total precipitation(P) and throughfall(T) in the pine stand as T=-1.8675+0.8320 P. in the hardwood stand as T=-8179+0.8805P. 2. And the sum of stemflow from measurement of total precipitation in the pine stand and the hardwood stand were 37.4mm(4.8%) and 15.5mm(2%), respectively. In total precipitation less than 2.5mm, stemflow were not measured in both the pine stand and the hardwood stand. Regression equations for the pine stand and the hardwood stand are S=-0.6155+0.0698P, S=-0.0497+0.0183P. The mean slope and intercept of the individual regression of stemflow on rainfall for each fewest stand indicate the proportion of the rain diverted to the trunks and trunk water capacity, respectively. 3. Interception loss accounted for 142.9mm(18.5%) in the pine stand and 125.2mm(16.2%), in the hardwood stand. 4. By quadratic predictive model of relation between interception loss and total incident rainfall, the extent of variance in interception loss explained was about 72% and 61% in the pine stand and the hardwood stand respectively.

1986년(年) 7월(月)부터 10일(日)서까지 울대학교(大學校) 관악수목원(冠岳樹木園) 내(內)에서 24년생(年生) 리기테다소나무로 구성된 침엽수림분(針葉樹林分)과 14년생(年生) 신갈나무등으로 구성된 활엽수림분(闊葉樹林分)을 대상으로 삼림(森林)의 강우차단현상(降雨遮斷現像)을 구명(究明)하고자 수관통과량(樹冠通過量)과 수간류하량(樹幹流下量)을 측정(測定)하여 분석(分析)한 결과(結果)를 요약(要約)하면 다음과 같다. 1) 측정기간(測定其間)동안 내린 총강우량(總降雨量)은 77.38mm였으며, 수관통과우량(樹冠通過雨量)은 침엽수림(針葉樹林)에서 593.3mm(76.7%), 활엽수림(闊葉樹林)에서 663.1mm(81.8%)이었다. 임외강우량(林外降雨量)(P)과 수관통과우량(樹冠通過雨量)(T)의 관계(關係)는 침엽수림(針葉樹林) ; T=-1.8675+0.8320P, T=-1.8179-0.8805P에 있다. 2) 수간류하량(樹幹流下量)이 2.5mm이하인 때는 수간류하량(樹幹流下量)이 측정(測定)되지 않았다. 임외강우량(林外降雨量)과 수간류하량(樹幹流下量)의 관계식(關係式)은 침엽수림(針葉樹林) ; S=-0.6155+0.0698P, 그리고 활엽수림(闊葉樹林) ; S=-0.0497+0.0183P이었다. 3) 차단손실량(遮斷損失量)은 침엽수림(針葉樹林)에서 총강우량(總降雨量)의 18.5%인 142.9mm, 활엽수림(闊葉樹林)에서 125.2mm(16.2%)로 침엽수림(針葉樹林)이 활엽수림(闊葉樹林)보다 약14.1%가 많았다. 4) 차단량(遮斷量)(I)과 임외강우량(林外降雨量)(P)의 관계는 침엽수림(針葉樹林)에서 $I=-0.3693+0.3666P-0.0033P^2$($R^2=0.72$), 활엽수림(闊葉樹林)에서 $I=-0.4817+0.3109P-0.0026P^2$($R^2=0.61$)로 나타났다.