Propagation of trembling aspen and hybrid poplar for agroforestry: potential benefits of elevated CO2 in the greenhouse
- 132 Downloads
We examined the usefulness of elevated CO2 in the greenhouse to aid in early selection of genotypes and in the propagation of Populus tremuloides Michaux (aspen) and hybrid poplars for agroforestry, afforestation, or reclamation. Growth in elevated (800 ppm) vs ambient (375 ppm) CO2 for 95 days resulted in greater height (14%), stem caliper (16%), overall biomass, and proportional allocation of biomass to roots as well as elevated net assimilation and water-use-efficiency. Aspen clones selected for superior growth (based on phenotypic selection) broke bud significantly earlier than unselected clones under both CO2 levels; superior clones were also taller with greater stem caliper under both CO2 treatments (but not significant). Under ambient CO2 male aspen were taller than females while under elevated CO2 female aspen were taller than males and also had greater caliper (but not significant). Hybrid poplar grown under elevated (vs ambient) CO2 broke bud significantly earlier and had significantly greater net assimilation and water-use efficiency; they were also taller with greater caliper (but not significant). Differences in performance among the eight hybrid clones were enhanced by growth under elevated CO2. Under ambient CO2, P38P38 was the clone that broke bud earliest, was tallest with greater caliper and had a lower shoot:root biomass ratio. Sargentii, on the other hand, was the shortest with the smallest caliper. The implications of these results need to be considered in the context of using aspen and hybrid poplar for large-scale agroforestry, afforestation and reclamation across Canada.
Unable to display preview. Download preview PDF.
- Bourdeau P.F. 1958. Photosynthetic and respiratory rates in leaves of male and female quaking aspen. Forest Science 4: 331-334Google Scholar
- Dickmann D.L.I., Isebrands J.G., Eckenwalder J.E. and Richard-son J. 2001. Poplar culture in North America. NRC Research Press, 397 pp.Google Scholar
- Littell R.C., Milliken G.A., Walter W. and Wolfinger R.D. 1996. SAS System for Mixed Models. SAS Institute Inc., Cary, NC, 633 pp.Google Scholar
- Peterson E.B. and Peterson N.M. 1992. Ecology, management and use of aspen and balsam poplar in the prairie provinces. For. Can. Northwest Reg. North. For Cent. Edmonton, Alberta. Spec. Rep. 1 252 pp.Google Scholar
- Radoglou K.M. and Jarvis P.G. 1990a. Effects of CO2 enrichment on four poplar clones. I. Growth and leaf anatomy. Ann. Bot. 65: 617-626Google Scholar
- Radoglou K.M. and Jarvis P.G. 1990b. Effects of CO2 enrichment on four poplar clones. I. Leaf surface properties. Ann. Bot. 65: 627-632Google Scholar
- Thomas B.R. 1996. Genetic variation and phenotypic plasticity in trembling aspen _Populus tremuloides Michaux_. PhD. Diss. Dept. of Renewable Resources, University of Alberta, Edmon-ton, AB, Canada, 162 pp.Google Scholar
- Thomas B.R., Macdonald S.E. and Dancik B.P. 1997. Variance components, heritabilities and gain estimates for growth cham-ber and field performance of Populus tremuloides: growth pa-rameters. Silvae Genetica 46: 317-326Google Scholar
- Tupker K.A. 2001. Response of trembling aspen _Populus tremu-loides Michaux_ and hybrid poplar _Populus spp._ to increased CO2 in the greenhouse. MSc Diss. Dept. of Renewable Resources, University of Alberta, Edmonton, AB, Canada, 117 pp.Google Scholar
- Wang S. Curtis P.S. Pregitzer K.S. and Zak D.R. 2000. Genotypic variation in physiological and growth responses of Populus tremuloides to elevated atmospheric CO2 concentration. Tree Phys. 20: 1019-1028Google Scholar
- Zsuffa L. 1992. Experiences in vegetative propagation of Populus and Salix and problems related to clonal strategies. In: Baker F.W.G. _ed._, Rapid Propagation of Fast-growing Woody Species. Redwood Press Ltd., London, pp. 86-97Google Scholar
- Zsuffa L., Giordano E., Pryor L.D. and Stettler R.F. 1996. Trends in poplar culture: some global and regional perspectives. In: Stettler R.F., Bradshaw H.D. Jr., Heilman P.E. and Hinckley T.M. _eds_, Biology of Populus and its implications for management and conservation. NRC Research Press. Ottawa, pp. 515-539Google Scholar