Forest Science最新文献_第2页

Marginal Productivity of Public Research in the Softwood Plywood Industry: A Dual Approach 软木胶合板行业公共研究的边际生产力：双重方法

IF 1.4 4区农林科学

Forest Science Pub Date : 2024-04-10 DOI: 10.1093/forestscience/33.4.872

Barry J. Seldon, David H. Newman

引用次数: 0

Crown Class Transition Rates of Maturing Northern Red Oak (Quercus rubra L.) 成熟的北方红橡树（Quercus rubra L.）的树冠等级转换率

IF 1.4 4区农林科学

Forest Science Pub Date : 2024-04-10 DOI: 10.1093/forestscience/40.2.221

Jeffrey S. Ward, George R. Stephens

{"title":"Crown Class Transition Rates of Maturing Northern Red Oak (Quercus rubra L.)","authors":"Jeffrey S. Ward, George R. Stephens","doi":"10.1093/forestscience/40.2.221","DOIUrl":"https://doi.org/10.1093/forestscience/40.2.221","url":null,"abstract":"Crown classes and diameters of 704 northern red oaks on medium quality sites were measured at 10-yr intervals between 1927-1987. Nominal age of northern red oaks at the beginning of the study was 25 yr. Mortality rates between ages 25-55 and between ages 55-85 decreased with each increase in crown class (i.e., mortality of dominant is &lt; codominant is &lt; intermediate is &lt; suppressed). Ascension rates into higher crown classes increased with each increase in crown class between ages 25-55 and between ages 55-85. Mortality rates of dominant, codominant, and intermediate trees were higher between ages 55-85 than between ages 25-55. The cause of the increased mortality was likely periodic episodes of defoliation which began after age 55. Within several diameter classes at age 25, survival through age 55 and the proportion found in upper canopy at age 55 increased with crown class. Mortality rates between ages 25-55 were lower for the largest northern red oak in a sprout clump than for lesser sprouts and for those trees which were not part of a sprout clump. There was no significant difference in canopy position transition rates between ages 55-85 for the largest red oaks in a sprout clump and those trees which were not part of a sprout clump. However, mortality rates between ages 55-85 of lesser trees in a sprout clump were significantly higher than for either the largest sprout in a clump or for those trees which were not part of a sprout clump. Survival of suppressed and intermediate 25-yr-old red oak was negatively related to the number of oaks in dominant and codominant crown classes. Crown class can be a powerful tool for determining the future status of maturing northern red oaks in southern New England. For. Sci. 40(2): 221-237.","PeriodicalId":12749,"journal":{"name":"Forest Science","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140566064","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}

引用次数: 0

Growth, Xylem Pressure Potential, and Nutrient Absorption of Loblolly Pine on a Reclaimed Surface Mine as Affected by an Induced Pisolithus tinctorius Infection 受诱导的褐斑梭菌感染影响的回收地表矿上的小叶松的生长、木质部压力势和养分吸收情况

IF 1.4 4区农林科学

Forest Science Pub Date : 2024-04-10 DOI: 10.1093/forestscience/35.2.569

R. F. Walker, D. C. West, S. B. McLaughlin, C. C. Amundsen

{"title":"Growth, Xylem Pressure Potential, and Nutrient Absorption of Loblolly Pine on a Reclaimed Surface Mine as Affected by an Induced Pisolithus tinctorius Infection","authors":"R. F. Walker, D. C. West, S. B. McLaughlin, C. C. Amundsen","doi":"10.1093/forestscience/35.2.569","DOIUrl":"https://doi.org/10.1093/forestscience/35.2.569","url":null,"abstract":"The effects of Pisolithus tinctorius ectomycorrhizae on survival, growth, xylem pressure potential, and nutrient uptake of loblolly pine on a southern Appalachian coal surface mine were examined. One-year-old bareroot seedlings artificially inoculated with P. tinctorius and control seedlings with Thelephora terrestris ectomycorrhizae were outplanted on a surface-mined site in Tennessee. The site had previously been contoured and hydroseeded with a mixture of herbaceous ground cover species. A soil fertility variable was imposed in the study by broadcast fertilization at outplanting of one-half of the plots of each mycorrhizal treatment at the rate of 336 kg/ha NPK. After 7 years, survival and growth of trees previously inoculated with P. tinctorius were significantly improved relative to control trees. Fertilization elicited a significant reduction in survival and a negligible growth response in trees of both mycorrhizal treatments due primarily to its stimulation of competing herbaceous species. During the third growing season, xylem pressure potential of seedlings with P. tinctorius ectomycorrhizae was significantly less negative than that of control seedlings during a prolonged period of moisture stress. Analyses of foliar samples collected during the third growing season revealed that seedlings infected by P. tinctorius had more NO3 and less Zn in their needles than control seedlings. The results of this study provide evidence that the benefits afforded loblolly pine on surface mines by P. tinctorius ectomycorrhizae include enhanced absorption of water as well as increased uptake of nutrients, and these benefits are not compromised by the presence of competing herbaceous species. For. Sci. 35(2):569-581.","PeriodicalId":12749,"journal":{"name":"Forest Science","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140566302","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}

引用次数: 0

Multiple-Pass Harvesting and Spatial Constraints: An Old Technique Applied to a New Problem 多重采集与空间限制：老技术应用于新问题

IF 1.4 4区农林科学

Forest Science Pub Date : 2024-04-10 DOI: 10.1093/forestscience/39.1.137

J. D. Nelson, D. Errico

引用次数: 0

Relative Accuracy of a New Base-Age Invariant Site Index Model 新的基龄不变遗址指数模型的相对准确性

IF 1.4 4区农林科学

Forest Science Pub Date : 2024-04-10 DOI: 10.1093/forestscience/40.2.341

Bijan Payandeh, Yonghe Wang

引用次数: 0

Management of Mixed-Species, Uneven-Aged Forests in the French Jura: From Stochastic Growth and Price Models to Decision Tables 法国汝拉地区树龄不均的混交林管理：从随机增长和价格模型到决策表

IF 1.4 4区农林科学

Forest Science Pub Date : 2024-04-10 DOI: 10.1093/forestscience/51.1.64

François Rollin, Joseph Buongiorno, Mo Zhou, Jean-Luc Peyron

{"title":"Management of Mixed-Species, Uneven-Aged Forests in the French Jura: From Stochastic Growth and Price Models to Decision Tables","authors":"François Rollin, Joseph Buongiorno, Mo Zhou, Jean-Luc Peyron","doi":"10.1093/forestscience/51.1.64","DOIUrl":"https://doi.org/10.1093/forestscience/51.1.64","url":null,"abstract":"A deterministic matrix growth model of uneven-aged stands of fir, spruce, and hardwood trees was extended to recognize random shocks. The results showed that the expected basal area of hardwoods, mainly beech, was substantially higher in the long run than that predicted by the deterministic model. A parallel stochastic model of prices was also developed from past data. It showed that real prices had no trend but that they were autocorrelated over time. The stochastic stand and price models were simulated simultaneously to obtain the probabilities of transition between stand and market states. This transition probability matrix was used in Markov decision-process models to calculate the best decision in each possible stand and market state. The policies examined included maximizing net present value, or expected tree diversity, production, or annual returns, subject to constraints on net present value, expected tree diversity, and basal area. A general mathematical programming method is presented to optimize economic or ecological objective functions subject to multiple constraints with or without time discounting. In the French Jura context, the solutions suggested that high net present value could be obtained while maintaining the average basal area near its current level, and keeping a high level of tree diversity. Accounting for risk called for more intense harvesting to raise revenues, and it led to stands that were much more diverse than suggested by deterministic solutions. FOR. SCI. 51(1):64–75.","PeriodicalId":12749,"journal":{"name":"Forest Science","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140566183","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}

引用次数: 0

Adjacency Branches Used To Optimize Forest Harvesting Subject to Area Restrictions on Clearfell 邻接枝条用于优化森林采伐，但受开伐面积限制

IF 1.4 4区农林科学

Forest Science Pub Date : 2024-04-10 DOI: 10.1093/forestscience/54.4.442

Alastair J. McNaughton, David Ryan

{"title":"Adjacency Branches Used To Optimize Forest Harvesting Subject to Area Restrictions on Clearfell","authors":"Alastair J. McNaughton, David Ryan","doi":"10.1093/forestscience/54.4.442","DOIUrl":"https://doi.org/10.1093/forestscience/54.4.442","url":null,"abstract":"Consider a forest containing units of various sizes for which a maximum clearfell area has been specified along with an associated green-up time period. For such an application it is customary to use adjacency constraints to produce a harvesting plan. These constraints control the availability for harvest of specific units relative to the harvesting of certain adjacent units. However, such constraints are difficult to formulate and often precipitate major difficulties in the implementation of the solution algorithm. A new concept, a nuclear set, is introduced. This concept allows the unit-specific aspects of the problem to be analyzed in an insightful manner. Any adjacency violation can be detected in relation to these nuclear sets. Suitable adjacency branches can be implemented to remove these violations. The form of these branches derives from the same nuclear sets. A remarkably small number of these branches are required to obtain a feasible solution. These ideas are incorporated into a column generation and constraint generation model. This new forest harvesting model solves the clearfell area restriction problem in an exact sense. Results are included for numerical trials involving simulated data representing moderately sized applications with a planning horizon of up to one rotation. The output from these trials suggests that this algorithm is suitable for large commercial applications. Several applications of 1,600 units are solved over 25 time periods with multiple green-up.","PeriodicalId":12749,"journal":{"name":"Forest Science","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140566227","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}

引用次数: 0

Changes in Albedo of a Northern Hardwood Forest Following Clearcutting 北方阔叶林疏伐后反照率的变化

IF 1.4 4区农林科学

Forest Science Pub Date : 2024-04-10 DOI: 10.1093/forestscience/41.2.268

Charles P.-A. Bourque, David A. Daugharty, Robert B. B. Dickison, Paul A. Arp

引用次数: 0

An Assessment of the Impacts of Forest Management on Aboriginal Hunters: Evidence from Stated and Revealed Preference Data 森林管理对原住民狩猎者影响的评估：来自声明和揭示偏好数据的证据

IF 1.4 4区农林科学

Forest Science Pub Date : 2024-04-10 DOI: 10.1093/forestscience/50.2.139

Wiktor Adamowicz, Peter Boxall, Michel Haener, Yaoqi Zhang, Donna Dosman, Juanita Marois

引用次数: 0

Developing Dynamic Site Index Curves for European Beech (Fagus sylvatica L.) in Denmark 为丹麦欧洲山毛榉（Fagus sylvatica L.）开发动态场地指数曲线

IF 1.4 4区农林科学

Forest Science Pub Date : 2024-04-10 DOI: 10.1093/forestscience/52.2.173

Thomas Nord-Larsen

引用次数: 0