Canopy Interception in a Hypermaritime Forest on the North Coast of British Columbia
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چکیده
Canopy interception plays an important role in determining the amount of rainfall reaching the forest floor. During a rainfall event, water either penetrates the canopy falling directly to the understory of the forest floor, or is intercepted by the canopy. From there it can drip to the ground surface, flow down tree stems, or be held and evaporated. The portion that falls directly to the ground or drips from the canopy is termed throughfall. Rainfall that is intercepted and flows down the tree trunk is known as stemflow, and the remainder is called interception. The amount of rainfall intercepted by a forest canopy depends on storm size, intensity, duration, rainfall frequency, forest structure, tree species and architecture, tree age, tree density, and epiphytic growth such as moss and lichens (Crockford and Richardson 1990; Calder 1998; Spittlehouse 1998). Depending on these conditions, canopy interception can account for 15 to 35% of annual rainfall.
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