A thorough understanding of the effects of the natural disturbances on successional dynamics is essential when developing silvicultural approaches. If applied correctly, this understanding should ensure the sustainable management of the wood resources, as well as the conservation of the biological attributes and ecological functions of forest ecosystems. With respect to the spatial and temporal complexity of the successional dynamics of forest ecosystems, simulation models are powerful tools as they are able to address many factors simultaneously.
Ecosystem-based management (EBM) presumes that sustainability is a function of how well we understand ecosystem function and ecological dynamics. This includes understanding relationships among climate, disturbance, vegetation patterns, and ecological services. Recent research on the historical ecology of montane forests in western Canada has challenged the long-standing notion that stand-replacing fires characterized the landscape. Instead, a mixed-severity regime (MSFR) existed in portions of the montane forest.
Midply walls have higher lateral resistance than traditional light wood frame shear walls, by creating double shear in fasteners and having larger edge distance. There is also a potential to use Midply wall as infills in Japanese Post and Beam construction, in order to improve the seismic performance of the current system. Little research has been done in this area. The proposed project will investigate the effect of different fasteners, stud material, and sheathing thickness on the behavior of Midply walls.
Driven by heightened environmental awareness, the construction industry increasingly strives to utilize materials such as timber with a low-carbon footprint in their life cycle. High-strength mass-timber products, innovative ductile connections, and fast computer-numerically-controlled pre-fabrication, combined with changing legislation create better opportunities to also build tall timber structures. However, low ductility and limited tensile strength of timber are challenges for such buildings particularly in high seismic zones.
Nowadays, massive timber floor/roof systems are designed by a simplified approach that treats the floor/roof and the supporting beams separately, thus ignoring the composite action between these two elements. Including the composite action in the calculations has the potential to increase the stiffness of the systems and to make their design more competitive and cost-effective. The key to achieve the composite action is to have a very stiff connection between the members.
Bull trout in the upper Fraser watershed (UFW) of British Columbia are important top predators and serve as the basis of a recreational fishery. Anglers in the region have asked government to consider changing current fishing regulations for bull trout from catch-and-release to regulations that allow them to take a portion of their catch home. Allowing for this regulatory change would increase the types of fishing opportunities in the area but could harm bull trout populations.
The Aboriginal housing situation in Canada is in crisis with a lack of culturally and environmentally appropriate housing. To address this need, this Mitacs Elevate project involves a collaboration between the Heiltsuk Nation (in Bella Bella, BC), the University of British Columbia, and FPInnovations. Through this project, a Participatory Approach towards Holistic Solutions (PATHS) framework was created and applied to help assess pathways with which the Heiltsuk Nation may effectively develop and implement community-led housing solutions.
The sequence of costly wildfires that burned at multiple locations in British Columbia and Alberta during fire seasons in 2003, 2015, 2016 and 2017 remind people that fires play an important part in forests of southwestern Canada. However, people are also increasingly recognizing the role of fire in providing ecological renewal and diversification. As a testament to this growth in understanding, forestry companies are embracing practices which include emulating historical fire regimes that exhibit a wide range of spatial and temporal characteristics such as fire shape and severity.
B.C.s Pacific salmon are in decline yet the causes are not clear. The role of disease in declining productivity is poorly understood but is potentially an important factor especially given recent controversies involving salmon farms and disease transmission to wild salmon. We have recently collected quantitative data on 47+ viral, bacterial, fungal, and protozoan pathogens in >16,000 out-migrating juvenile sockeye, Chinook and coho salmon and 4,500 salmon from farms culturing Atlantic and Chinook salmon.
In recent years, globalization and increasing international traffic have allowed tree infecting micro-organisms and pests to colonize new forests and plantations. These invasions are a threat to global trade and the delicate ecological balance of our forests. Good examples are the Sudden Oak Death (SOD) outbreak caused by Phytophthora ramorum in California and the emerald ash borer in eastern Canada. Such epidemics can wreak havoc and halt international trade resulting in loss of millions of dollars.