Microclimate Studies in Uniform Shelterwood Systems in the Sub-Boreal Spruce Zone of Central British Columbia PDF Download
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Author: Robert Matthew Sagar
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 40
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Book Description
This study was initiated in 2001 as part of a uniform shelterwood trial located in the dry, warm Sub-Boreal Spruce subzone (sbsdw) near Williams Lake, B.C., after a second harvesting entry was completed. The focus of the main trial was to test various levels of residual basal retention and harvesting methods on the establishment, survival, and productivity of Douglas-fir regeneration. The microclimate component was set up to help interpret tree performance by comparing the climate conditions among three of the residual basal area treatments (0, 15, and 20 m2/ha). The objectives for the microclimate portion of the shelterwood project were to compare soil temperatures and snow-free periods among the three residual basal area treatments (0, 15, and 20 m2/ha); to compare the incidence, duration, and severity of growing season frosts among the three residual basal area treatments (0, 15, and 20 m2/ha); and to investigate the effects of local canopy density on minimum near-ground air temperatures and duration of frost events during the growing season.--Document.
Author: Robert Matthew Sagar
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 40
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Book Description
This study was initiated in 2001 as part of a uniform shelterwood trial located in the dry, warm Sub-Boreal Spruce subzone (sbsdw) near Williams Lake, B.C., after a second harvesting entry was completed. The focus of the main trial was to test various levels of residual basal retention and harvesting methods on the establishment, survival, and productivity of Douglas-fir regeneration. The microclimate component was set up to help interpret tree performance by comparing the climate conditions among three of the residual basal area treatments (0, 15, and 20 m2/ha). The objectives for the microclimate portion of the shelterwood project were to compare soil temperatures and snow-free periods among the three residual basal area treatments (0, 15, and 20 m2/ha); to compare the incidence, duration, and severity of growing season frosts among the three residual basal area treatments (0, 15, and 20 m2/ha); and to investigate the effects of local canopy density on minimum near-ground air temperatures and duration of frost events during the growing season.--Document.
Author: Philip Joseph Burton
Publisher: University of British Columbia Press
ISBN:
Category : Nature
Languages : en
Pages : 80
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Book Description
Three replicates of a uniform shelterwood trial were established in even-aged stands dominated by Douglas-fir in the SBSdw1 variant northeast of Williams Lake, B.C., with initial harvesting conducted in the summer of 1991. Treatments consisted of a two-stage shelterwood leaving 50% residual basal area (RBA) after the first entry and a three-stage shelterwood leaving 70% RBA, with overstory thinning achieved by hand-falling or by feller-buncher. Treatment units were 1.4 ha in area, with an uncut control (100% RBA) at each site. Seedfall was monitored using ten 0.37 m 2 seedfall traps in each treatment unit, inspected twice a year from 1992 through 1998. The abundance of different ground surface materials was surveyed in 1990, 1991, and 1993. Controlled germination experiments were conducted in 1994, 1995, and 1996. on four seedbed materials (forest floor, live moss, rotting wood, and mineral soil) across all RBA levels. Surveys of the density of natural regeneration were conducted in 1990, 1991, 1993, 1994, and 1996. ... Results to date suggest that a low residual basal area, combined with a high level of forest floor disturbance, is preferable for enhancing conifer regeneration. It is tentatively recommended that a preparatory cut is not necessary for naturally regenerating Douglas-fir under a shelterwood overstory in this zone, and that the seed cut should leave less than 50% residual basal area.
Author: Robert Matthew Sagar
Publisher:
ISBN:
Category : Bioclimatology
Languages : en
Pages : 60
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Book Description
The objectives of this study were to: 1. compare the key environmental variables between blocks (elevational effect) and treatments (clearcut and irregular group shelterwood with whole-tree harvesting partial cut), and between microsites within partial cut openings (north and south edges and centre); and 2. examine temporal changes occurring to environmental variables in the context of the changing biological environment. This document includes an introduction, methods, results and discussion, and a summary.--Includes text from document.
Author: Robert Matthew Sagar
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 42
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Book Description
Author: British Columbia. Forest Research Division
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 100
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Author: Dagmar Gabriele Keisker
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Book Description
Author:
Publisher:
ISBN:
Category : Forest genetics
Languages : en
Pages : 344
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Author: Kevin Gordon Driscoll
Publisher:
ISBN:
Category : Forest soils
Languages : en
Pages : 0
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Author: Jean Heineman
Publisher:
ISBN:
Category : Juvenile Nonfiction
Languages : en
Pages : 24
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Book Description
Almost all harvested sites in the interior cedar hemlock (ICH) zone of British Columbia are currently planted, but natural regeneration can be a viable reforestation alternative in small patch cuts or where a partial canopy is retained. This report describes a project in which five small, variable-sized patch cuts in an ICH forest were studied to determine the effects of opening size, edge characteristics, and substrate quality on the distribution & composition of natural regeneration. Results are presented & discussed regarding regeneration at four years after harvest.
Author: Robert Matthew Sagar
Publisher:
ISBN:
Category : Peace River Regional District (B.C.)
Languages : en
Pages : 0
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