Abstract
(1) Stands of Salix viminalis L. (clone Bowles hybrid), growing near Edinburgh, were studied in two successive years. In 1984, the stands grew from coppiced stumps at 0 5 m spacing in the field. In 1985, the stands grew from cuttings in containers of compost, at 0 3 m spacing, supplied with trickle irrigation and nutrients. (2) Interception of total solar radiation by the canopies was measured using tube solarimeters. Regular harvests were made to determine above-ground dry matter in 1984 and both above-ground and root dry matter in 1985. Leaf area index (L) was also determined, and total stem surface area was estimated in 1985. (3) Accumulated dry matter was linearly related to accumulated intercepted radiation until heavy leaf fall. The slopes of the relationships for above-ground dry matter were 0 99 g MJ-I in 1984 and 1 38 g MJ-1 in 1985. This difference in light-use efficiency (rather than a difference in amounts of light intercepted) was primarily responsible for a difference between years in above-ground dry matter production (11 t ha-1y-I in 1984 and 14 t ha y1 in 1985). Greater efficiency in 1985 was attributed to better water and nutrient supplies and lower levels of incoming radiation. (4) L reached 2 4 in 1984 and 4 5 in 1985. The relationship between L and fractional interceptance (f) was:
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