Response of Red Squirrels and Feeding Damage to Variable Stand Density in Young Lodgepole Pine Forest

1996 ◽  
Vol 6 (4) ◽  
pp. 1124-1134 ◽  
Author(s):  
Thomas P. Sullivan ◽  
Walt Klenner ◽  
Paul K. Diggle
Keyword(s):  
Lodgepole Pine ◽  
Stand Density ◽  
Pine Forest ◽  
Feeding Damage ◽  
Red Squirrels

Prediction of stand susceptibility to feeding damage by red squirrels in young lodgepole pine

1994 ◽  
Vol 24 (1) ◽  
pp. 14-20 ◽  
Author(s):  
Thomas P. Sullivan ◽  
John A. Krebs ◽  
Paul K. Diggle
Keyword(s):  
British Columbia ◽  
Population Studies ◽  
Lodgepole Pine ◽  
Forecast Model ◽  
Shrub Cover ◽  
Feeding Damage ◽  
Red Squirrels ◽  
Site Class ◽  
Potential Factors ◽  
Major Factors

This paper provides a forecast model to predict when and where significant feeding damage by red squirrels (Tamiasciurushudsonicus Erxleben) will occur in managed stands of lodgepole pine (Pinuscontorta Dougl. var. latifolia Engelm.). Information from 51 managed stands (average DBH > 6.0 cm) in the interior of British Columbia and from past squirrel population studies was used to formulate the model. Incidence of damage was significantly greater in stands originating from wildfire than from harvesting. Stands within the Montane Spruce biogeoclimatic zone had the highest levels of damage of the five zones sampled. There was no relationship between damage incidence and average stand diameter, area of managed stand, or site class. In a subset of stands where understory shrub data were available, shrub cover was positively related to incidence of damage. Major factors in the forecast model that influence stand susceptibility include (i) stand origin and proximity to mature timber; (ii) frequency of cone crops leading to squirrel population increases in juvenile pine; and (iii) shrub cover, which may provide security from predators. Additional potential factors include (iv) switching of predators from squirrels to snow-shoe hares (Lepusamericanus Erxleben) during peak years of the hare cycle and (v) fertilization. A decisionmaking profile is outlined for prespacing surveys to identify susceptible stands.

Long-term responses of ecosystem components to stand thinning in young lodgepole pine forest

2006 ◽  
Vol 228 (1-3) ◽  
pp. 69-81 ◽  
Author(s):  
Thomas P. Sullivan ◽  
Druscilla S. Sullivan ◽  
Pontus M.F. Lindgren ◽  
Douglas B. Ransome
Keyword(s):  
Lodgepole Pine ◽  
Pine Forest ◽  
Stand Thinning

Changes in structure and cover of a common property pine forest in Guatemala, 1954–1996

2004 ◽  
Vol 31 (1) ◽  
pp. 22-29 ◽  
Author(s):  
CURTIS D. HOLDER
Keyword(s):  
Forest Structure ◽  
Common Property ◽  
Forest Cover ◽  
Municipal Government ◽  
Stand Density ◽  
Forest Products ◽  
Pine Forest ◽  
Aerial Photographs ◽  
Secondary Forests ◽  
Communal Property

Concern about increasing rates of deforestation of tropical forests has resulted in investigations into the viability of local land-use practices and communal forms of governance. The majority of people in Guatemala live in regions where primary forests are absent. Several secondary forests in the highly populated highlands of Guatemala are communally managed forests, and people depend on forest products from these secondary forests for their livelihood. This study examines changes in forest structure and coverage of a native Pinus oocarpa Schiede communally managed forest in San Jose La Arada, Chiquimula in eastern Guatemala from 1954–1996. The pine forest is a municipal-communal property. The municipality has title to the land, however the forests are communal property. Neither forest committees in the villages nor municipal government regulations establish communal management of the pine forest; instead there are customary rules in the villages that guide forest extraction. People from the surrounding villages extract fuelwood, ocote (resin-rich wood harvested from the tree trunk and used for kindling) and timber from the pine forest. The P. oocarpa forest is situated in a seasonally dry region with nutrient-poor and highly eroded soils. Aerial photographs from 1954 and 1987 were compared to estimated changes in forest cover. Changes in forest structure are based on data collected from stand inventories conducted in 1987 and 1996. The pine forest was reduced in area by 14.4%, from 12.39 km2 in 1954 to 10.61 km2 in 1987. Additionally, stand density and basal area were reduced by 12% and 41%, respectively, from 1987–1996. Fuelwood and timber for domestic use were not extracted at a sustainable rate between 1954 and 1996 from the communally managed pine forest in this study. A sustainable-use management plan, in which all villages surrounding the forest participate, is recommended to provide future forest products for the villages.

scholarly journals Mountain Pine Beetle Infestation: Cycling and Succession in Lodgepole Pine Forest

1981 ◽  
Vol 5 ◽  
pp. 131-135
Author(s):  
W. Romme ◽  
J. Yavitt ◽  
D. Knight
Keyword(s):  
National Parks ◽  
Yellowstone National Park ◽  
National Park ◽  
Pinus Contorta ◽  
Mountain Pine Beetle ◽  
Lodgepole Pine ◽  
Pine Forest ◽  
Mountain Pine ◽  
Pine Beetle ◽  
Surrounding Areas

A research project was initiated in 1980 to study the effects of outbreaks of the mountain pine beetle (Dendroctonus ponderosae Hopkins) on lodgepole pine forest (Pinus contorta Dougl. ssp. latifolia) in Yellowstone National Park and surrounding areas. This native insect apparently has long been associated with lodgepole pine, and reports of small numbers of beetles can be found in Park records as early as 1925. However, in the late 1940's and early 1950's major outbreaks began to occur on the Caribou and Targhee National Forests immediately to the west and southwest of Yellowstone and Grand Teton National Parks. An outbreak in Grand Teton National Park and the adjacent Teton National Forest began in the 1950's, with an explosive increase in 1961 followed by an eventual subsidence in the late 1960's. The first major outbreak in Yellowstone National Park began in the late 1960's in the Bechler and South Entrance areas, reaching a peak there in 1970 and later declining. Yearly aerial surveys conducted thereafter showed a steady northward movement of the outbreak through the western half of the Park at a rate of 1 - 5 km per year. By 1978 the peak outbreak was centered around West Yellowstone, with hundreds of infested trees per hectare. The outbreak is now moving north and east along the Madison and Gibbon Rivers, with the greatest beetle populations currently in the vicinity of Madison Junction.

scholarly journals Long-term influence of stand thinning and repeated fertilization on forage production in young lodgepole pine forests

2017 ◽  
Vol 47 (8) ◽  
pp. 1123-1130 ◽  
Author(s):  
Pontus M.F. Lindgren ◽  
Thomas P. Sullivan ◽  
Douglas B. Ransome ◽  
Druscilla S. Sullivan ◽  
Lisa Zabek
Keyword(s):  
Pinus Contorta ◽  
Large Scale ◽  
Bos Taurus ◽  
Lodgepole Pine ◽  
Stand Density ◽  
Stand Age ◽  
Forage Production ◽  
South Central ◽  
Stand Thinning

Integration of trees with forage and livestock production as silvopastoralism is another potential component of intensive forest management. Stand thinning and fertilization may enhance growth of crop trees and understory forage for livestock. We tested the hypothesis that large-scale precommercial thinning (PCT) (particularly heavy thinning to ≤1000 stems·ha−1) and repeated fertilization, up to 20 years after the onset of treatments, would enhance production of graminoids, forbs, and shrubs as cattle (Bos taurus L.) forage. Results are from two long-term studies: (1) PCT (1988–2013) and (2) PCT with fertilization (PCT–FERT) (1993–2013) of lodgepole pine (Pinus contorta Dougl. ex Loud. var. latifolia Engelm.) stands in south-central British Columbia, Canada. Mean biomass estimates of graminoids, forbs, total herbs, and shrubs were not affected by stand density. However, fertilization enhanced mean biomass estimates of graminoids, forbs, and total herbs, but not shrubs. Thus, the density part of our hypothesis was not supported, but the nutrient addition part was supported at least for the herbaceous components. Biomass of the herbaceous understory was maintained as a silvopasture component for up to 20 years (stand age 13 to 33 years) in fertilized heavily thinned stands prior to canopy closure.

Stand dynamics 11 years after retention harvest in a lodgepole pine forest

2018 ◽  
Vol 427 ◽  
pp. 169-181 ◽  
Author(s):  
Justin S. Crotteau ◽  
Christopher R. Keyes ◽  
Sharon M. Hood ◽  
Andrew J. Larson ◽  
Elaine Kennedy Sutherland ◽  
...  
Keyword(s):  
Lodgepole Pine ◽  
Pine Forest ◽  
Stand Dynamics
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