Ecophysiological processes as determinants for understanding growth of poplars in the Canadian boreal zone

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This project is a continuation of a previous CRD grant through which we had installed and studied several fast-growing plantations of hybrid poplars in north eastern Canada. We aim to improve our understanding of nutrient requirements of hybrid poplars in the boreal zone using mineral or organic amendment, and understand the role of litter decomposition in pure and mixed plantations on soil fertility and plantation productivity. We also want to understand the specific ecophysiology of different types of hybrid poplars/aspens compared to their native parents, and relate it to fertilization and moisture levels. For regions where the use of exotic species is impossible or prohibited we want to understand the regeneration dynamics and genetic structure of natural balsam poplar stands, in order to be able to use it to devise appropriate propagation/deployment scenarios to reforest natural hardwood stands or to limit its regeneration in areas where it is not desired. The results of this project will allow the Canadian industry to use and cultivate poplars and fast-growing plantations to alleviate wood shortages and new harvesting restrictions on public lands.