Working forest landscapes in BC are increasingly dominated by young stands planted with genetically selected, faster growing trees grown from seed produced in seed orchards. Tree breeding has increased the productivity of these stands by close to 20%; however, questions remain on the long-term effects of tree breeding and reforestation on genetic diversity. The resilience of stands to climate change, insects and diseases, and the continued production of economic and ecological benefits are dependent on maintaining adequate genetic diversity within stands and across landscapes.

This project will examined consequences of reforestation seed use policy and landscape deployment on forests-level genetic diversity. The team of Prof. Sally Aitken at UBC and Dr. Nicholas Ukrainetz from BC Ministry of Forest Land Natural Resources Operations & Rural Development, with support from Western Forest Products and Mosaic Forest Management, used a combination of existing and new genomic data as well as simulation modelling approaches to investigate genetic diversity of individual reforestation seedlots, established stands, and forest landscapes.

Building on existing genomic data for the economically and ecologically important conifer species, lodgepole pine, while generating new data for coastal Douglas-fir, the team will first determine levels of genetic diversity of seeds produced by seed orchards. Next, they assessed genetic diversity of well established, planted stands and compare the results to the original seedlots. Finally, the results were used in a simulation model to assess the effects of different approaches to reforestation on forest diversity and resiliency across larger areas, now and into the future. Building on the outcomes from past investments from Genome BC and Genome Canada, the results from this project will provide guidance on policies or practices for maintaining forest health, productivity, and economic benefits for the people of BC.