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Comparative analysis of thinning techniques in pine forests

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Journal of forestry Research 2022年第4期33卷 1145-1156页

作者： Maame Esi Hammond Radek Pokorný Simon Abugre Augustine Gyedu Department of Silviculture Faculty of Forestry and Wood TechnologyMendel University in BrnoZemědělská361300 BrnoCzech Republic Department of forest Science School of Natural ResourcesUniversity of Energy and Natural ResourcesP.O.Box 214SunyaniGhana forest Services Division(FSD) P.M.BKumasiGhana

Thinning is a necessary and complex forestry *** complexity increases due to theoretical disagreements,contradictory recommendations,and errors of modern practice,which require confirmation through longtime *** article presents a summary of experimental results from plantations established 20–30 years ago and explains concepts of the theory,methods,and regime of thinning in permanent sample plots of pine stands in Gatchinsky forest of the Leningrad *** research results allow for the clarification of growth patterns and age dynamics of pine stands subject to heavy,low thinning,as well as the results of applying the crown(high)thinning technique and a mixed treatment.A combined thinning and fertilization could improve wood quality and yield compared to conventional *** particular scientific importance is the analysis of change in tree diameter classes during growth and after *** research results allow for optimizing the treatment regime in pine plantations and reducing labor intensity by increasing the intensity of thinning and reducing the number of techniques.

关键词： forest management practices forest stand Selective thinning Silviculture

Changes in the growth of Scots pine(Pinus sylvestris L.)stands in an urban environment in European Russia since 1862

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林业研究:英文版 2023年第5期34卷 1279-1287页

作者： Aleksandr V.Lebedev Department of Agricultural Meliorations Forestry and Land OrganizationRussian State Agrarian University-Moscow Timiryazev Agricultural AcademyTimiryazevskaya49MoscowRussia 127434

A century and a half ago,in the European part of Russia(Moscow),forest scientists established the first long-term observations of forests,many of which are under observation to the present *** the twentieth century,climate changes and,due to industrial development,forest areas were under air *** on observations from 157 sites,this study shows that the growth and density of Scots pine(Pinus sylvestris L.)have decreased by the end of the twentieth *** environment has changed,and the growth and development of plantations has *** yields(-34%stand volume)and their life expectancy(on average 50 years)have *** changes are critical for forestry and for the management of forests in urban *** to the decline in growth,ecosystem functions by urban forests has *** order to increase the sustainability of urban forests and the provision of ecosystem services,it is preferable to create multi-species stands with a complex structure.

关键词： forest stand Scots pine stand growth Urbanized environment Human footprint

Ice storm damage to oak forests in subtropical China

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forest Ecosystems 2023年第3期10卷 368-377页

作者： Jinyu Guo Jifa Cui Nan Wu Yaqian Zhang Jie Wang Hanyu Xiang Baoshuang Hu Youbing Zhou Engineering Research Center of Eco-environment in Three Gorges Reservoir Region Ministry of EducationChina Three Gorges UniversityYichang443002China

Ice storms,as important sources of frequent and injurious disturbances,drive forest dynamics in the Northern ***,stand-level differential vulnerability to ice storms and the associated factors that predispose forest stands remain *** is particularly concerning in the subtropics where the frequency of ice storms is predicted to increase with global *** we assessed how the impact on three forest stands(early and late secondary-growth forests,and old-growth forests)differed after an extreme ice storm during 20–21 March 2022,and identified the abiotic and biotic factors that determine the damage intensity in the Shennongjia World Natural Heritage Site,a biodiversity conservation hotspot in central *** found a stand-specific‘middomain effect’where the late secondary-growth forest sustained the most severe damage,the early secondarygrowth forest sustained the least,and the old-growth forest suffered an intermediate amount.‘Crown broken’was the most severe damage type across all three forest stands,although the proportion of‘branch broken’was also high in the old-growth *** played a significant role in determining the vulnerability of the early secondary-growth forest to severe ice storms whereas the forest structure and composition were important factors in explaining the damage rates in the old-growth forest,although they differed among the damage *** contrast,topography,forest structure and composition generally explain the intensity of damage in the late secondary-growth *** results highlight that,in subtropical forests,the intensity of damage caused by severe ice storms and related determining factors are stand-level *** also suggest exploring potential management strategies(e.g.,slow-growing hardwood species that can resist storms should be the main species for reforestation in early secondary-growth forests)to mitigate the risk of future severe ice storms,as well as other wind-related cli

关键词： Ice storm forest stand Extreme climate forest vulnerability Abiotic and biotic factors Oak forest