Treesearch

Seasonal changes in the magnitude and duration of streamflow can have important implications for aquatic species, drinking water supplies, and water quality. In many regions, including the Pacific Northwest (U.S. and Canada), seasonal low flow is declining, primarily due to a changing climate, but is also influenced by urbanization, agriculture, and forestry. We review the responses of seasonal low flow, catchment storage, and tree-water relations to forest harvest over long timescales and discuss the potential implications of these responses for current forest practices and aquatic biota....

The increasing amount of high-severity wildfire in historical low and mixed-severity fire regimes in western US forests has created a need to better understand the ecological effects of different post fire management approaches. For three different salvage prescriptions, we quantified change in stand structural metrics (snag densities and snag basal areas), dead woody fuel loadings, tree regeneration survival, and percentage change in vegetation cover before and after post-fire logging 1 year after the 2015 Stickpin Wildfire on the Colville National Forest in northeastern Washington State,...

This special issue of the Canadian Journal of Forest Researchhighlights research presented at the 12th North American Forest Ecology Workshop (NAFEW), which took place in Flagstaff, Arizona, USA, in June 2019. NAFEW is a biennial workshop series designed with the explicit mission “to bring researchers, academicians, and managers together to foster dialogue and discussion of current issues related to basic and applied research in forested ecosystems in North America”. NAFEW 2019 was a truly continental conference. Over 300 attendees from Canada, Mexico, and the United States gathered to...

Amplified climate warming at high northern latitudes is challenging societies that depend on local provisional and cultural ecosystem services, e.g., subsistence resources, for their livelihoods. Previous qualitative research suggests that climate-induced changes in environmental conditions are affecting rural residents’ ability to travel across the land and access local resources, but detailed information on the nature and effect of specific conditions is lacking. Our objectives were to identify climate-related environmental conditions affecting subsistence travel and access, and then...

As a long-term investment, timberland investments offer financial benefits including portfolio diversification, attractive risk/return profile, an inflation hedge and the potential of cash flow. Based on interviews with experts regarding ranges of input parameters used in single-hectare financial models and Monte Carlo simulation method, we examine what are the main factors that influence internal rates of returns (IRRs) in several global timber plantation investment opportunities: loblolly pine on the U.S. Atlantic coastal plain; Douglas-fir plan- tations in the western U.S.; loblolly...

The South of Brazil is one of the most attractive regions for timberland investments in the world. High pro- ductivity and relatively attractive timber prices have gained attention from timberland investors. However, as in most emerging countries, it is not very clear how prices are transmitted across products and markets. Having this information is essential to strategic planning as well as understand the market structure. We investigate market linkages of the stumpage price of five products (fuelwood, pulpwood, sawtimber, veneer, and special veneer) in the three main pine producing...

The walnut twig beetle, Pityophthorus juglandisBlackman (Coleoptera: Scolytidae), vectors a phytopathogenic fungus, Geosmithia morbidaKolařík et al. (Hypocreales), which causes thousand cankers disease (TCD) in walnut (Juglanssp.) and wingnut (Pterocaryasp., both Juglandaceae) trees. We investigated an early point in disease inception in two walnut species – Juglans californicaS. Wats. and Juglans major(Torr. ex Sitsgr.) Heller – native to riparian forests of the western USA by comparing P. juglandisflight and landing responses to small‐diameter branch sections. Twenty unbaited branch...

We used molar measurements from 136 known-age red tree voles (Arborimus longicaudus) to develop regression models that could estimate tree vole age from skeletonized remains. The best regression included a quadratic structure of the ratio between two measurements, crown height and anterior height, and natural log-transformed age in days. The regression predicted that molar roots begin to develop at 40 days of age and that molar crowns are worn completely away at 1,177 days of age. We used the regression to estimate the age distribution of 1,703 red tree voles found in northern spotted owl...

Subsurface flow dominates water movement from hillslopes to streams in most forested headwater catchments. Hewlett and Hibbert (1963, https://doi.org/10.1029/JZ068i004p01081) constructed an idealized hillslope model (0.91 × 0.91 × 15.0 m; 21.8°) using reconstituted C horizon soil to investigate importance of interflow, a type of subsurface flow. They saturated the model, covered it to prevent evaporation, and allowed free drainage for 145 days. The resulting recession drainage curve suggested two phases: fast drainage of saturated soil in the first 1.5 days and then slow drainage of...

Black ash (Fraxinus nigra) wetlands are an important economic, cultural, and ecological resource in the northern Great Lake States, USA, and are threatened by the invasive insect, emerald ash borer (Agrilus planipennis Fairmmaire [EAB]). EAB-induced ash mortality can increase air temperatures, alter understory vegetation communities, and modify wetland hydrology by elevating the water table following canopy dieback, which may, in turn, alter nitrogen cycling in wetland soils and affect plant N uptake, N export to watersheds, and N emissions to the atmosphere. We sampled soils in replicated...