The influence of the geometry and distribution of root systems on coppice regeneration and growth of hybrid poplars

Abstract

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Raw material characterization and properties of structural flakeboard from coppice grown hybrid poplar

“…The linear effect of a decreasing number of sprouts with increasing planting density accounted for almost all (99.93%) of the variation in the number of sprouts per stump due to planting density. The influence of parent stand spacing on the number of sprouts emerging after coppice has been reported by others and is similar to those trends observed here (Ek et al, 1983;Lee, 1978).…”

“…Others have reported that differences in height growth, for original planted seedlings or cuttings, did not become apparent until after the second growing season (Bowersox and Ward, 1976;Dawson et al, 1976). However, the clonal rankings for height growth for each planting density at age three after coppicing, are different from those reported by Lee (1978) Table A1 (Appendix A). DIAONE ranged from 3.30 cm to 8.43 cm.…”

“…Early growth and yield studies for SRIC systems were based on limited information from small, young research plots, yields for coppice rotations were projections (Ek and Dawson, 1976). (Dawson, 1976;Lee, 1978;and Murphey et al, 1979).…”

“…Previous work has shown planting density to have little effect on wood properties of SRIC material (Dawson, 1976;Lee, 1978;and Murphey et al, 1979). However, since initial planting density may influence coppice regeneration, primarily the number and survival of sprouts, resulting tree characteristics may be more sensitive to different initial planting densities.…”

“…The ability of a species to regenerate substantial above ground biomass from adventitious and/or dormant buds eliminates the need for replanting between rotations. Moreover, the growth of these sprouts is usually accelerated from the existence of a well-established root system (Lee, 1978). While the number of coppice rotations which a root system can support is in question, it is clear that this method of stand regeneration is economically more attractive to the SRIC program than conventional regeneration methods (Lothner, 1983).…”