Cost-effective brightening of thermomechanical pulp from mountain pine beetle-infested lodgepole pine

We developed a cost-effective bleaching method for overcoming the brightness ceiling of thermomechanical pulp (TMP) made from mill chips containing predominantly mountain pine beetle-infested lodgepole pine. The method involves synergistic bleaching of the TMP in the refiner with hydrosulfite (Y) and diethylenetriaminepentaacetic acid (DTPA) as the chelating agent. The synergistic, in-refiner Y+DTPA bleaching, when followed by post-refiner Y or peroxide bleaching, can provide higher brightness gain or lower bleaching chemical cost for Y- or peroxide-bleached TMP from the mill chips. Estimated cost savings for Y bleaching to 60.0% ISO brightness and peroxide bleaching to 74.3% ISO brightness are USD 5.2/ton pulp and USD 5.2-6.2/ton pulp, respectively.

Download Full-text

Pre-logging Baiting with Semiochemicals for the Mountain Pine Beetle, Dendroctonus Ponderosae, in High Hazard Stands of Lodgepole Pine

The Forestry Chronicle ◽

10.5558/tfc62020-1 ◽

1986 ◽

Vol 62 (1) ◽

pp. 20-23 ◽

Cited By ~ 5

Author(s):

J. H. Borden ◽

L. J. Chong ◽

T. E. Lacey

Keyword(s):

Pinus Contorta ◽

Mountain Pine Beetle ◽

Lodgepole Pine ◽

Dendroctonus Ponderosae ◽

Cost Effective ◽

Additional Advantage ◽

Mountain Pine ◽

Massive Influx ◽

Pine Beetle ◽

High Hazard

Baiting of trees with attractive semiochemicals prior to logging in three high hazard blocks of lodgepole pine (Pinus contorta var. latifolia Engelm.) was effective in inducing attack by the mountain pine beetle (Dendroctonus ponderosae Hopkins) on baited trees and on surrounding unbaited trees. There was evidence for partial shifting of attack loci, concentration of dispersing beetles and containment of emergent beetles as a result of the baiting program. However, baiting was ineffective when the baits were within the understory canopy, and the baiting program did not cause a massive influx of beetles from infestations 75-200 m away from the baited blocks. Such baiting programs would be cost effective if they avoided the necessity of disposing of two attacked trees/ha outside of the baited blocks. They have the additional advantage of reducing the risk of future beetle attacks by removing beetles and their broods during logging of induced infestations.

Download Full-text

Mountain pine beetle attack severity data in lodgepole pine in the Northern Rockies from 1999-2014

Forest Service Research Data Archive ◽

10.2737/rds-2017-0006 ◽

2017 ◽

Cited By ~ 1

Author(s):

Howard L. Williams ◽

Sharon M. Hood ◽

Chrisopher R. Keyes ◽

Joel M. Egan

Keyword(s):

Mountain Pine Beetle ◽

Lodgepole Pine ◽

Mountain Pine ◽

Pine Beetle ◽

Northern Rockies

Download Full-text

Forest structure altered by mountain pine beetle outbreaks affects subsequent attack in a Wyoming lodgepole pine forest, USA

Canadian Journal of Forest Research ◽

10.1139/x11-142 ◽

2011 ◽

Vol 41 (12) ◽

pp. 2403-2412 ◽

Cited By ~ 9

Author(s):

Daniel M. Kashian ◽

Rebecca M. Jackson ◽

Heather D. Lyons

Keyword(s):

Pinus Contorta ◽

Mountain Pine Beetle ◽

Stand Structure ◽

Lodgepole Pine ◽

Climate Change Scenarios ◽

Cone Production ◽

Mountain Pine ◽

Large Trees ◽

Pine Beetle ◽

The 1960S

Extensive outbreaks of the mountain pine beetle ( Dendroctonus ponderosae Hopkins) will alter the structure of many stands that will likely be attacked again before experiencing a stand-replacing fire. We examined a stand of lodgepole pine ( Pinus contorta var. latifolia Engelm. ex S. Watson) in Grand Teton National Park currently experiencing a moderate-level outbreak and previously attacked by mountain pine beetle in the 1960s. Consistent with published studies, tree diameter was the main predictor of beetle attack on a given tree, large trees were preferentially attacked, and tree vigor, age, and cone production were unimportant variables for beetle attack at epidemic levels. Small trees killed in the stand were killed based mainly on their proximity to large trees and were likely spatially aggregated with large trees as a result of the previous outbreak. We concluded that the driving factors of beetle attack and their spatial patterns are consistent across outbreak severities but that stand structure altered by the previous outbreak had implications for the current outbreaks in the same location. This study should catalyze additional research that examines how beetle-altered stand structure affects future outbreaks — an important priority for predicting their impacts under climate change scenarios that project increases in outbreak frequency and extent.

Download Full-text