Interception de la pluie dans la sapinière à bouleau blanc, Forêt Montmorency

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Abstract
Rainfall interception from four balsam fir stands and in a clearcut site, was examined in lake Laflamme watershed area, Montmorency Forest, 80 km north of Québec City. The four balsam fir stands were 25 to 65 years old and were defoliated from 20 to 70% by spruce budworm (Choristoneurafumiferana (Clem.)); the clearcut site was covered by logging debris and vegetation less than 1 m high. Rainfall interception in the balsam fir stands varied from 15.1 to 38.6%; it tended to decrease with increasing defoliation and to increase with increasing cover. During the summer of 1982, interception in the clearcut and the average for the lake Laflamme forested watershed were 32.3 and 35.0%, respectively. Stemflow (0.3 to 3.8%) was negligible in those stands. Net precipitation and interception can be calculated from gross rainfall and the relations established in this study.