We used a permanent sample plot network established to monitor the effects of forest management practiced in mature northern hardwood and mixedwood stands in Quebec, Canada to address two important questions related to tree mortality: (1) How does partial cutting affect tree mortality? (2) Which variables best explain tree mortality by different modes of death (standing death, uprooting or stem breakage)? Decennial tree deaths were lower after partial cutting than in unharvested plots, but the annual proportion of tree death was similar (1.25%·year-1). At the tree level, a risk-product classification demonstrated the strongest evidence on influencing total mortality, followed by species, the presence of a logging injury, and tree size. Annual temperature was the only climatic variable explaining variations in total risk of tree mortality, and always among the first three variables explaining differences among the three modes of death. The risk of standing death also increased with increasing annual precip...
{"title":"Partitioning risks of tree mortality by modes of death in managed and unmanaged northern hardwoods and mixedwoods","authors":"GuillemetteFrançois, GauthierMartin-Michel, OuimetRock","doi":"10.5558/TFC2017-033","DOIUrl":"https://doi.org/10.5558/TFC2017-033","url":null,"abstract":"We used a permanent sample plot network established to monitor the effects of forest management practiced in mature northern hardwood and mixedwood stands in Quebec, Canada to address two important questions related to tree mortality: (1) How does partial cutting affect tree mortality? (2) Which variables best explain tree mortality by different modes of death (standing death, uprooting or stem breakage)? Decennial tree deaths were lower after partial cutting than in unharvested plots, but the annual proportion of tree death was similar (1.25%·year-1). At the tree level, a risk-product classification demonstrated the strongest evidence on influencing total mortality, followed by species, the presence of a logging injury, and tree size. Annual temperature was the only climatic variable explaining variations in total risk of tree mortality, and always among the first three variables explaining differences among the three modes of death. The risk of standing death also increased with increasing annual precip...","PeriodicalId":50433,"journal":{"name":"Forestry Chronicle","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5558/TFC2017-033","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41594318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The development of habitat restoration techniques for restoring critical woodland caribou (Rangifer tarandus caribou) winter habitat will play an important role in meeting the management thresholds in woodland caribou recovery plans. The goal is to restore disturbed environments within critical winter habitat for the declining woodland caribou. Woodland caribou are diet specialists, utilizing lichen-rich habitat for forage during winter months. Cladonia sub-genus Cladina is the most frequently eaten species during this time. Herein, we provide: 1) A review of previously used methods for transplanting Cladonia sub-genus Cladina and their feasibility in restoring woodland caribou winter habitat; 2) A stepby- step protocol on how to carry out a terrestrial lichen transplant program (using Cladonia sub-genus Cladina and C. uncialis); and, 3) An evaluation of our protocol through the establishment of a case study in northern British Columbia. Our results indicate that transplanting C. sub-genus Cladina fragmen...
{"title":"Examining the role of terrestrial lichen transplants in restoring woodland caribou winter habitat","authors":"Sean B. Rapai, Duncan McColl, R. McMullin","doi":"10.5558/TFC2017-029","DOIUrl":"https://doi.org/10.5558/TFC2017-029","url":null,"abstract":"The development of habitat restoration techniques for restoring critical woodland caribou (Rangifer tarandus caribou) winter habitat will play an important role in meeting the management thresholds in woodland caribou recovery plans. The goal is to restore disturbed environments within critical winter habitat for the declining woodland caribou. Woodland caribou are diet specialists, utilizing lichen-rich habitat for forage during winter months. Cladonia sub-genus Cladina is the most frequently eaten species during this time. Herein, we provide: 1) A review of previously used methods for transplanting Cladonia sub-genus Cladina and their feasibility in restoring woodland caribou winter habitat; 2) A stepby- step protocol on how to carry out a terrestrial lichen transplant program (using Cladonia sub-genus Cladina and C. uncialis); and, 3) An evaluation of our protocol through the establishment of a case study in northern British Columbia. Our results indicate that transplanting C. sub-genus Cladina fragmen...","PeriodicalId":50433,"journal":{"name":"Forestry Chronicle","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5558/TFC2017-029","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47954229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"New Business Model for New Times / Nouveaux temps, nouveau modèle d’entreprise","authors":"RentonJeff","doi":"10.5558/TFC2017-027","DOIUrl":"https://doi.org/10.5558/TFC2017-027","url":null,"abstract":"","PeriodicalId":50433,"journal":{"name":"Forestry Chronicle","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5558/TFC2017-027","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44609414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Canada’s National Forest Inventory (NFI) is facing an issue of spatial imbalance in photo interpreted data from 400 ha photo-plots available for estimation of state and change. Multiple imputations (MI) of missing data is therefore considered as a means to mitigate a potential bias arising from spatial imbalance, and—to a lesser degree— improve the precision relative to what can be achieved with the subset of plots having current data. In this study we explored MI with data from three study sites located in the provinces of Quebec, Ontario, and Saskatchewan. Specifically, we looked at state at time T2 and change between T1 and T2 in cover-type area proportions and in per unit area stem volume. At each location we found significant T1 differences in these attributes between plots with and without T2 data. A MI procedure with 20 replications of stochastic model-based imputations of missing data was therefore effective as a way to mitigate a bias that would arise if T2 inference was based exclusively on plot...
{"title":"Updating Canada’s National Forest Inventory with multiple imputations of missing contemporary data","authors":"MagnussenSteen, StinsonGraham, BoudewynPaul","doi":"10.5558/TFC2017-030","DOIUrl":"https://doi.org/10.5558/TFC2017-030","url":null,"abstract":"Canada’s National Forest Inventory (NFI) is facing an issue of spatial imbalance in photo interpreted data from 400 ha photo-plots available for estimation of state and change. Multiple imputations (MI) of missing data is therefore considered as a means to mitigate a potential bias arising from spatial imbalance, and—to a lesser degree— improve the precision relative to what can be achieved with the subset of plots having current data. In this study we explored MI with data from three study sites located in the provinces of Quebec, Ontario, and Saskatchewan. Specifically, we looked at state at time T2 and change between T1 and T2 in cover-type area proportions and in per unit area stem volume. At each location we found significant T1 differences in these attributes between plots with and without T2 data. A MI procedure with 20 replications of stochastic model-based imputations of missing data was therefore effective as a way to mitigate a bias that would arise if T2 inference was based exclusively on plot...","PeriodicalId":50433,"journal":{"name":"Forestry Chronicle","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5558/TFC2017-030","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43731637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The research evaluated opportunities for cutting off small understory beech root suckers at 0.6-0.9 m above ground. By six years (pilot test) after cutting with lopping shears in a closed-canopy uneven-aged northern hardwood stand, 91% of high stumps lacking a residual live branch had died. Of those cut above the lowest living branch, all survived. In a later operational trial by contract crews using chainsaws two growing seasons before a selection system cutting, 75% of high stumps without a residual live branch had died by the fifth year. Of stumps cut below the lowest living branch and that initially sprouted, only 7% had a live sprout by the sixth year. Among high stumps cut above the lowest branch, 84% survived.
{"title":"Beech shearing/high-stumping to control understory interference","authors":"D. NylandRalph, H. Diane","doi":"10.5558/TFC2017-028","DOIUrl":"https://doi.org/10.5558/TFC2017-028","url":null,"abstract":"The research evaluated opportunities for cutting off small understory beech root suckers at 0.6-0.9 m above ground. By six years (pilot test) after cutting with lopping shears in a closed-canopy uneven-aged northern hardwood stand, 91% of high stumps lacking a residual live branch had died. Of those cut above the lowest living branch, all survived. In a later operational trial by contract crews using chainsaws two growing seasons before a selection system cutting, 75% of high stumps without a residual live branch had died by the fifth year. Of stumps cut below the lowest living branch and that initially sprouted, only 7% had a live sprout by the sixth year. Among high stumps cut above the lowest branch, 84% survived.","PeriodicalId":50433,"journal":{"name":"Forestry Chronicle","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5558/TFC2017-028","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42570804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Heterobasidion irregulare is a basidiomyceteous forest pathogenic fungus which causes a root disease capable of killing large trees. Infection probability is proportional to the density of aerial basidiospores infecting freshly cut stumps. The purpose of this study was to quantify for the first time H. irregulare aerial basidiospore density in southern Quebec and to determine the importance of a local basidiospore load from a nearby infested plantation. Spore counts from automated rotary arm spore collectors were assayed using a ribosomal ITS TaqMan real-time PCR detection assay. Cumulative basidiospore deposits on a 30-cm stump were estimated to be highest in the infected plantation with 2.37 basidiospores per stump, with decreasing count of 0.52 basidiospores at a 500-m distance and 0.46 basidiospores at a 1.5-km distance. At 5 km from the infected plantation, the number of basidiospores deposited on a stump was 0.22, a value similar to those at distances of 25 and 140 km. Since a single Heterobasidion ...
{"title":"Importance of local and long-distance Heterobasidion irregulare aerial basidiospore dispersal for future infection centres in thinned red pine plantations in Quebec","authors":"A. BérubéJean, PotvinAmélie, StewartDonald","doi":"10.5558/TFC2017-032","DOIUrl":"https://doi.org/10.5558/TFC2017-032","url":null,"abstract":"Heterobasidion irregulare is a basidiomyceteous forest pathogenic fungus which causes a root disease capable of killing large trees. Infection probability is proportional to the density of aerial basidiospores infecting freshly cut stumps. The purpose of this study was to quantify for the first time H. irregulare aerial basidiospore density in southern Quebec and to determine the importance of a local basidiospore load from a nearby infested plantation. Spore counts from automated rotary arm spore collectors were assayed using a ribosomal ITS TaqMan real-time PCR detection assay. Cumulative basidiospore deposits on a 30-cm stump were estimated to be highest in the infected plantation with 2.37 basidiospores per stump, with decreasing count of 0.52 basidiospores at a 500-m distance and 0.46 basidiospores at a 1.5-km distance. At 5 km from the infected plantation, the number of basidiospores deposited on a stump was 0.22, a value similar to those at distances of 25 and 140 km. Since a single Heterobasidion ...","PeriodicalId":50433,"journal":{"name":"Forestry Chronicle","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5558/TFC2017-032","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47879212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We used precommercial thinning (PCT) to accelerate natural succession in an 8-year-old, even-aged stratified mixture, in which trembling aspen (Populus tremuloides) overtopped a dense understory of balsam fir (Abies balsamea) and spruce (Picea mariana, P. glauca). In addition to an unthinned control, we applied three residual aspen spacings (2.5, 3.0 and 3.5 m) while retaining all understory conifers, and a 3.0-m spacing retaining only small conifers (<1/3 of the aspen crop tree height). PCT improved survival of spruce, increased diameter growth of aspen by 90% and doubled diameter and height growth of conifers, without differences among spacings or between levels of conifer retention after 10 years. The level of conifer retention did not affect aspen growth response, but appeared to influence the occurrence of browsing on aspen and balsam fir. Retaining only small conifers decreased regeneration density of balsam fir in favour of abundant vegetative reproduction of red maple (Acer rubrum) and beaked haze...
{"title":"Precommercial thinning of overtopping aspen to release coniferous regeneration in a boreal mixedwood stand","authors":"M. Prévost, Lise Charette","doi":"10.5558/TFC2017-034","DOIUrl":"https://doi.org/10.5558/TFC2017-034","url":null,"abstract":"We used precommercial thinning (PCT) to accelerate natural succession in an 8-year-old, even-aged stratified mixture, in which trembling aspen (Populus tremuloides) overtopped a dense understory of balsam fir (Abies balsamea) and spruce (Picea mariana, P. glauca). In addition to an unthinned control, we applied three residual aspen spacings (2.5, 3.0 and 3.5 m) while retaining all understory conifers, and a 3.0-m spacing retaining only small conifers (<1/3 of the aspen crop tree height). PCT improved survival of spruce, increased diameter growth of aspen by 90% and doubled diameter and height growth of conifers, without differences among spacings or between levels of conifer retention after 10 years. The level of conifer retention did not affect aspen growth response, but appeared to influence the occurrence of browsing on aspen and balsam fir. Retaining only small conifers decreased regeneration density of balsam fir in favour of abundant vegetative reproduction of red maple (Acer rubrum) and beaked haze...","PeriodicalId":50433,"journal":{"name":"Forestry Chronicle","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5558/TFC2017-034","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48708555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Most tree species in agroforestry plantings are intolerant to vegetative competition and sites must be intensively cultivated to eliminate weeds. Many studies have been conducted to investigate what factors limit seedling growth because of the presence of vegetative competition in forest environments; however on agricultural sites there are few studies on weed management options for tree planting. This research quantified and compared growth of Manitoba maple (Acer negundo), green ash (Fraxinus pennsylvanica), Colorado spruce (Picea pungens), Scots pine (Pinus sylvestris) and Walker poplar (Populus x Walker) in response to combinations of in-row and between-row weed control methods. The study was established on an agroforestry planting on agricultural soils in Saskatchewan. Treatments included in-row weed control using herbicides or plastic mulch and between-row weed control using tillage compared with a non-weeded control. Weed control positively affected annual height increment, basal diameter and heigh...
农林业种植中的大多数树种都不耐植物竞争，必须对其进行集中栽培以消除杂草。已经进行了许多研究来调查由于森林环境中存在营养竞争而限制幼苗生长的因素；然而，在农业现场，很少有关于植树的杂草管理选择的研究。本研究量化并比较了马尼托巴省枫树（Acer negundo）、青灰树（Fraxinus pennylvanica）、科罗拉多云杉（Picea pungens）、苏格兰松（Pinus sylvestris）和沃克杨（Populus x Walker）对行内和行间杂草控制方法组合的反应。该研究建立在萨斯喀彻温省农业土壤上的农林种植上。处理包括使用除草剂或塑料覆盖物进行的行杂草控制，以及与非除草控制相比使用耕作进行的行间杂草控制。杂草控制对年高增长、基部直径和海拔高度有正向影响。。。
{"title":"Effect of weed control methods on growth of five temperate agroforestry tree species in Saskatchewan","authors":"NaeemH.","doi":"10.5558/TFC2017-035","DOIUrl":"https://doi.org/10.5558/TFC2017-035","url":null,"abstract":"Most tree species in agroforestry plantings are intolerant to vegetative competition and sites must be intensively cultivated to eliminate weeds. Many studies have been conducted to investigate what factors limit seedling growth because of the presence of vegetative competition in forest environments; however on agricultural sites there are few studies on weed management options for tree planting. This research quantified and compared growth of Manitoba maple (Acer negundo), green ash (Fraxinus pennsylvanica), Colorado spruce (Picea pungens), Scots pine (Pinus sylvestris) and Walker poplar (Populus x Walker) in response to combinations of in-row and between-row weed control methods. The study was established on an agroforestry planting on agricultural soils in Saskatchewan. Treatments included in-row weed control using herbicides or plastic mulch and between-row weed control using tillage compared with a non-weeded control. Weed control positively affected annual height increment, basal diameter and heigh...","PeriodicalId":50433,"journal":{"name":"Forestry Chronicle","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5558/TFC2017-035","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42607682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Forestry is a dynamic discipline! / La foresterie : une discipline en constante évolution!","authors":"Wayne BellF.","doi":"10.5558/TFC2017-013","DOIUrl":"https://doi.org/10.5558/TFC2017-013","url":null,"abstract":"","PeriodicalId":50433,"journal":{"name":"Forestry Chronicle","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2017-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5558/TFC2017-013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42686645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B. Wayne, DacostaJennifer, G. NewmasterSteven, MallikAzim, HuntShelley, AnandMadhur, MalolesJose, PengChanghui, PartonJohn, McLaughlinJohn, WintersJohn, WesterMonique, ShawMargo
The NEBIE plot network is a stand-scale, multi-agency research project designed to compare the ecological effects of a range of silvicultural treatments in northern temperate and boreal forest regions of Ontario, Canada. While research on silviculture intensities has been previously conducted, the NEBIE plot network is at a larger scale, and covers a wider range of intensities in a variety of northern temperate and boreal forest types. Details about experimental design, treatment designs and research sites, are presented in a companion paper which is published in this edition of The Forestry Chronicle. The operational scale of treatment plots allow for assessment of a variety of forest values. We used a criteria and indicator approach to organize long-term research studies on the network sites, with the goal of providing scientific findings that would inform forest policy. Pre-treatment, and 2-, 5-, and 10-year post-harvesting data have been collected. These initial data add to existing information on the...
{"title":"The NEBIE plot network: Highlights of long-term scientific studies","authors":"B. Wayne, DacostaJennifer, G. NewmasterSteven, MallikAzim, HuntShelley, AnandMadhur, MalolesJose, PengChanghui, PartonJohn, McLaughlinJohn, WintersJohn, WesterMonique, ShawMargo","doi":"10.5558/TFC2017-019","DOIUrl":"https://doi.org/10.5558/TFC2017-019","url":null,"abstract":"The NEBIE plot network is a stand-scale, multi-agency research project designed to compare the ecological effects of a range of silvicultural treatments in northern temperate and boreal forest regions of Ontario, Canada. While research on silviculture intensities has been previously conducted, the NEBIE plot network is at a larger scale, and covers a wider range of intensities in a variety of northern temperate and boreal forest types. Details about experimental design, treatment designs and research sites, are presented in a companion paper which is published in this edition of The Forestry Chronicle. The operational scale of treatment plots allow for assessment of a variety of forest values. We used a criteria and indicator approach to organize long-term research studies on the network sites, with the goal of providing scientific findings that would inform forest policy. Pre-treatment, and 2-, 5-, and 10-year post-harvesting data have been collected. These initial data add to existing information on the...","PeriodicalId":50433,"journal":{"name":"Forestry Chronicle","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2017-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43588776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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