Boreal forests comprise 73% of the world's coniferous forests. Based on forest floor measurements, they have been considered a significant natural sink of methane (CH4) and a natural source of nitrous oxide (N2O), both of which are important greenhouse gases. However, the role of trees, especially conifers, in ecosystem N2O and CH4 exchange is only poorly understood. We show for the first time ...

1 DISRUPT Micro-Flake Verbenone Bark Beetle Anti-Aggregant flakes (Hercon Environmental, Inc., Emigsville, Pennsylvania) were applied in two large-scale tests to assess their efficacy for protecting whitebark pine Pinus albicaulis Engelm. from attack by mountain pine beetle Dendroctonus ponderosae Hopkins (Coleoptera: Scolytinae) (MPB). At two locations, five plots of equivalent size and stand ...

University House 1, PO Box 1700, STN CSC, University of Victoria, Victoria, British Columbia, Canada, V8W 3R4 Phone: 250-721-6236 | Fax: 250-721-7217 | pacificclimate.org In a recent paper in Nature Climate Change, Mikkelson (2013) and colleagues find that municipal water supplies that draw from mountain pine beetle-infested source regions have higher concentrations of both organic carbon and p...

There is abundant evidence that evergreen conifers living at high elevations or at high latitudes have longer-lived needles than trees of the same species living elsewhere. This pattern is likely caused by the influence of low temperature in combination with related factors such as a short growing season and low nutrient availability. Because it is not known to what degree such patterns result ...

Surveys were conducted on regenerating stands of lodgepole pine to determine the relationship between root deformation and susceptibility to attack by the Warren root collar weevil, Hylobius warreni Wood. The total number of trees attacked by H. warreni did not differ between planted and natural trees. A matched case-control logistic regression suggested that root cross-sectional area was more ...

The resin tapping history of an Aleppo pine (Pinus halepensis ssp halepensis) forest in Northern Evia, Central Greece was investigated by standard dendrochronological methods. Cross-sections disks of tapped and non-tapped trees were taken from a representative, concerning structure and management, Aleppo pine stand. The identification of resin tapping scars in the cross-sections, combined with ...

Tapping technique comprises the extraction of pine oleoresin, a non-wood forest product consisting of a complex mixture of mono, sesqui, and diterpenes biosynthesized and exuded as a defense response to wounding. Oleoresin is used to produce gum rosin, turpentine, and their multiple derivatives. Oleoresin yield and quality are objects of interest in pine tree biotechnology, both in terms of env...

Pine trees cover large portions of the Himalayan region and are considered a hazard to cultivation and agriculture as well as the environment. This is because during the summer season, dry pine needles fall from the trees and cover the forest floor. Not only is this detrimental to cultivation, and the growth of grass needed as fodder for livestock, this is also a serious cause of uncontrolled f...

Photosynthate production is reduced by foliage loss. Thus, scorch-induced decreases in the leaf area of longleaf pine (Pinus pa/u&is Mill.) may reduce photosynthate allocation to roots. In this investigation the root carbohydrate concentrations and dynamics of longleaf pine after two intensities of prescribed burning were monitored. In September 1996,65-year-old longleaf pine were burned. Plots...

Thinning of the site to a target basal area of 65 ft/ac was conducted in June 1999 to maintain stands within the 50to 80-ft/ac basal area range recommended for red-cockaded woodpecker (Picoides borealis) habitat (US Fish and Wildlife Service [USFWS] 2009). Additionally, it was thought that by reducing stand stocking the remaining trees would have sufficient growing space to better respond to ma...