Download or read book Early Effects of Manipulating Aspen Density and Spatial Arrangement on Lodgepole Pine Performance Aspen Sucker Production and Stand Development in an 11 year old Stand in the SBPSxc Subzone of South central British Columbia written by and published by . This book was released on 2006 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Early Effects of Manipulating Aspen Density and Special Arrangement on Lodgepole Pine Performance Aspen Sucker Production and Stand Development in an 11 year Old Stand in the SBPSxc Subzone of South central British Columbia written by Teresa A. Newsome and published by . This book was released on 2006 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mixtures of trembling aspen (Populus tremuloides Michx.) and lodgepole pine (Pinus contorta var. latifolia Engelm.) regenerate naturally throughout the Sub-Boreal Pine-Spruce (SBPS), Interior Douglas-fir (IDF), Sub-Boreal Spruce (SBS), and Interior Cedar-Hemlock (ICH) zones in the Cariboo-Chilcotin area of the Southern Interior Forest Region. Due to the rapid height growth and high initial sucker densities of young aspen, these stands generally require some management at the juvenile stage to meet conifer growth objectives. Strategies designed to lessen competition from young aspen have become more complex over the past decade. In light of current understanding of the importance of broadleaf tree species to overall ecosystem health, successful management of young pine-aspen stands now requires practitioners to find a balance between removing aspen to meet lodgepole pine growth objectives and retaining as much aspen as possible to preserve the ecosystem benefits conferred by broadleaf species, reduce suckering, and reduce silviculture treatment costs. The Clusko aspen removal study, established in 2001 in an 11-year-old lodgepole pine-trembling aspen stand in the SBPSxc subzone, investigates the effects of five levels of aspen removal on target pine, neighbourhood competitive interactions, and stand development. Treatments include: (1) an untreated control; (2) complete aspen removal; broadcast retention of (3) 1000 and (4) 2500 aspen stems ha-1; and (5) a spatial treatment that removed aspen within a 1-m radius around target pine. This report presents second-year results from the Clusko River (Clusko) study.
Download or read book Early Effects of Manipulating Aspen Density on Lodgepole Pine Performance Aspen Sucker Production and Stand Development in an 11 year old Stand in the SBPSxc Subzone of South central British Columbia written by Teresa A. Newsome and published by . This book was released on 2006 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Early Effects of Manipulating Aspen Density and Spatial Arrangement on Lodgepole Pine Performance written by Teresa A. Newsome and published by . This book was released on 2006 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Variable Aspen Retention on Stand Development Aspen Sucker Production and Growth of Lodgepole Pine in the SBSdw1 Variant of South central British Columbia written by Teresa A. Newsome and published by . This book was released on 2006 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mixtures of trembling aspen (Populus tremuloides Michx.) and naturally regenerated or planted lodgepole pine (Pinus contorta var. latifolia Engelm. ex S. Wats.) occur throughout interior British Columbia. To develop effective management strategies for mixed stands where softwood timber production is the primary objective, silviculturists need information about levels of broadleaves that can be retained without seriously reducing conifer performance. They also require practical guidance on using this information to develop cost-effective treatment prescriptions. To address this topic in the Cariboo-Chilcotin, a pine-aspen competition project that includes studies in a variety of ecosystems is currently under way. In 1999, an operational trial to study the effects of variable aspen retention on stand-level lodgepole pine performance and aspen sucker production was established near McKinley Lake in the SBSdw1 variant of the Central Cariboo Forest District. The study was a co-operative undertaking by the B.C. Ministry of Forests and Weldwood of Canada, Ltd. In 2002, the study was adopted by the Silvicultural Systems Research Group of the Southern Interior Forest Region as part of the pine-aspen competition project, and objectives and methods were subsequently adapted to include the collection of long-term growth and yield and stand development data. This report summarizes fourth-year pine and aspen responses to aspen retention treatments, and provides baseline stand development information.
Download or read book Early Effects of Manipulating Aspen Density on Lodgepole Pine Performance Aspen Sucker Production and Stand Development in the IDFxm Subzone Near Williams Lake B C written by Teresa A. Newsome and published by . This book was released on 2004 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trembling aspen (Populus tremuloides Michx.) is a common component of forests throughout interior British Columbia, particularly in north and central parts of the province. In the Cariboo-Chilcotin area of the Southern Interior Forest Region, aspen commonly regenerates along with planted and natural lodgepole pine (Pinus contorta var. latifolia Engelm.) in the Interior Douglas-fir (IDF), Sub-Boreal Spruce (SBS), Sub-Boreal Pine-Spruce (SBPS), and Interior Cedar-Hemlock (ICH) biogeoclimatic zones. Although aspen can be a strong competitor with shade-intolerant pine, maintaining a low-density aspen component within stands offers many benefits to both individual conifers and the site as a whole. Until recently, managing aspen included reducing its presence among young pine as much as possible by applying aggressive site preparation and brushing treatments. While strategies for managing mixed broadleaf-conifer stands are now changing throughout British Columbia, forest practitioners still require information about threshold levels of broadleaves that can be retained without seriously affecting conifer performance. A retrospective study to investigate the effects of aspen competition on lodgepole pine in the Cariboo region was established in 1992 and, by 1997, results were suggesting that dry-belt (IDFdk) thresholds for aspen as tall or taller than target pine were in the range of 2000-5000 stems ha-1. To investigate pine-aspen interactions further and to more clearly define thresholds for aspen retention in the Cariboo-Chilcotin dry-belt, a variable density study was established in 1998 at a site near Meldrum Creek in the IDFxm subzone. This technical report presents 4th-year results of that study.
Download or read book Effects of Variable Aspen Retention on Stand Development Aspen Sucker Production and Stand Development and of Lodgepole Pine in the SBSdw1 Variant of South central British Columbia written by Teresa A. Newsome and published by . This book was released on 2006 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Competitive Effects of Trembling Aspen on Lodgepole Pine Performance in the SBS and IDF Zones of the Cariboo Chilcotin Region of South central British Columbia written by Teresa A. Newsome and published by . This book was released on 2003 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes & presents results of a retrospective study carried out between 1992 and 1999 in the Cariboo-Chilcotin region of British Columbia to quantify the effects of trembling aspen competition on lodgepole pine performance, and to identify competition indices or other measures of competition that could be used by field staff. Target pine were selected across neighbourhoods in six stands with varying densities of aspen. Data pertaining to pine size & condition, and to the size & location of aspen within a 70-inch radius of the pine were collected three times. Measurements began when the stands were seven to 12 years old. Various approaches are used to identify levels of aspen abundance when pine performance declined below acceptable levels. These include analyses of regression & correlation, tests of existing competition indices, and visual & statistical characterization of trends. Finally, conservative recommendations are made for the retention of aspen within pine stands in the Cariboo-Chilcotin region.
Download or read book Relative Impact of Aspen Competition and Soil Factors on the Performance of Lodgepole Pine and Hybrid White Spruce in North central British Columbia written by C. DeLong and published by . This book was released on 2007 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Releasing conifers from the competition effects of aspen (Populus tremuloides Michx.) is a key focus of plantation management in sub-boreal and boreal forests, often at considerable cost. However, other factors affect early plantation performance. This study investigates the relative influence of aspen competition and soil factors on the performance of planted lodgepole pine (Pinus contorta Dougl. ex Loud.) and hybrid white spruce (Picea glauca [Moench] Voss x engelmannii Parry ex Engelm.) in north-central British Columbia. Plots were established across a gradient of natural aspen competition levels that resulted from a test of aspen control treatments at one site. Within these plots, 240 of each of the target conifer species were measured and their immediate soil and vegetative environment quantified. Regression trees and regression analysis were used to examine the importance of aspen competition relative to other factors in determining target conifer size."--Document.
Download or read book Initial Growth Development and Clonal Dynamics of Regenerated Aspen in the Rocky Mountains written by Wayne D. Shepperd and published by . This book was released on 1993 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book British Columbia Rangeland Seeding Manual written by Allan Dobb and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessing the Effect of Aspen Competition on Lodgepole Pine Growth in the IDFdk3 4 EP1152 written by Cariboo Forest Region (B.C.). Research Section and published by . This book was released on 1999 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Historically broadleaf trees have been considered weeds when growing in conifer stands and have been removed from young stands to avoid the negative effects from competition. However, retention of some broadleaf trees in conifer stands is becoming a more accepted practice for a variety of reasons. The broadleaf component provides many biological advantages including enhancing soil properties and alleviating weather extremes on the understory conifers. Its presence benefits wildlife and increases the biodiversity of a stand. Broadleaf trees can have economic value, although in the current market, broadleaf trees with commercial value are not common in the IDF. Even when the above factors are not considered, removal of broadleaf trees from a stand can be expensive. Therefore brushing should only be done when necessary. Determining the need for brushing when the primary objective is growing a conifer crop is the focus of this research. The growth strategies of both species, but especially the conifer, will affect the relationship between the conifer and the broadleaf trees. The purpose of this study is to investigate and quantify the effects of trembling aspen (Populus tremuloides) competition on lodgepole pine (Pinus contorta) in young stands, 5 to 15 years old. The information in this note can be used by silviculturists when considering stand tending options and by foresters looking for options for increasing biodiversity in young stands.
Download or read book Adjusting Free growing Guidance Regarding Aspen Retention in the Cariboo Chilcotin written by Teresa A. Newsome and published by . This book was released on 2016 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2008, a Working Group that included British Columbia government staff (researchers, stewardship foresters, and wildlife habitat experts), a research consultant, and industry foresters was formed in the Cariboo Region of south-central British Columbia to determine how existing research concerning conifer#x13;broadleaf competitive relationships could be used to suggest change to free-growing guidelines for that region. The objective was to adjust free-growing criteria concerning broadleaf tree presence in coniferous plantations while maintaining consistency with biological thresholds for conifer growth that had been determined by local research. ...
Download or read book Assessing the Effects of Aspen Competition on Lodgepole Pine Growth written by Cariboo Forest Region (B.C.). Research Section and published by . This book was released on 1997 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: With its economic value being recognized and the requirement to enhance biodiversity, natural aspen's regeneration has been considered by the forest resource managers. A competition index is used to predict levels of competition between plant species for making treatment decisions. Many competition indices have been developed by researchers with the intention to produce a simple but reliable indicator of competition levels. In this retrospective study, 11 competition indices were tested using measurements from some natural pine/aspen stands.
Download or read book Simulated Browsing Impacts on Aspen Suckers Density Growth and Nutritional Responses written by Koketso Tshireletso and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Heavy and repeated ungulate browsing on reproductive suckers has limited trembling aspen (Populus tremuloides Michx.) regeneration on many Western landscapes. However, little is known about the specific effects of season and intensity of browsing. My objectives were to determine the effects of season and intensity of clipping (simulated browsing) on suckers' (1) density and growth characteristics, and (2) nutritional quality and quantity. Three randomly selected stands were clear-felled in mid-July, 2005, and fenced. Simulated browsing treatments of 0%, 20%, 40%, and 60% removal of current year's growth were randomly applied in early, mid-, and late summers of 2006 and 2007. Sucker density, height, leader length, twig numbers, bud numbers, basal area, and biomass harvested were monitored in each quadrat. Harvested material was analyzed for crude protein and in vitro true dry matter digestibility. Early summer clipped suckers suffered no winter mortality compared to mortalities of 41% and 42% for mid- and late summer clipped suckers, respectively. Sucker height was restricted by all early summer treatments. Clipping at 20% and 40% in mid- and late summer, respectively, did not reduce sucker height, but suckers clipped 60% were less than or equal to ̲40 cm shorter than controls. Twig and bud density both declined with increasing intensity of clipping. By the study's end, basal area of early summer clipped suckers was higher than for those clipped in late summer. Crude protein of clipped biomass decreased with season's advance and clipping intensity. Levels ranged from 12.8% to 22.9% and 10.6% to 16.5% in 2006 and 2007, respectively. Digestibility ranged from 80.1% to 93.4% and 75.2% to 90.7% in 2006 and 2007, respectively. Biomass (260 vs. 181 kg/ha) and total digestible dry matter (197 vs. 142 kg/ha) harvested were higher in mid-summer clipped plots in 2007 than in 2006, respectively. Apart from early summer, total nitrogen harvested was not affected differently by season of clipping. Clear-felling programs that allow browsing of less than or equal to 40% in mid- and late summer would ensure sustained aspen stand density and growth.
Download or read book Growth density Relations in Young Aspen Sucker Stands written by Imre E. Bella and published by edmonton : northern forest research centre. This book was released on 1975 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Establishment to Free Growing Guidebook Prince George Forest Region written by British Columbia. Ministry of Forests and published by Ministry of Forests. This book was released on 2001 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
