I haven't done original work in forestry and climate impacts, but I'm familiar with the work of others. In general, northern latitude countries, like Canada and Russia, are still expected to be net beneficiaries for agriculture and forestry as a result of climate change.
The fifth assessment report of the IPCC made this particularly clear for forestry. Recent studies that I have seen, including in Nature magazine, continue to say that Canada, overall for agriculture, will experience net benefits from a longer growing season, warmer conditions and generally favourable conditions for crop types that aren't necessarily sustainable in our climate now.