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Study on the Structural Characteristics and Physical and Mechanical Properties of Phoebe bournei Thinning wood

Journal of Renewable Materials 2022年第11期10卷 3025-3039页

作者： Jiabiao Wu Jiayin Liang Muyang Chen Siqi Zheng Jianying Xu College of Materials Science and Engineering Central South University of Forestry and TechnologyChangsha410004China

The artificial afforestation of precious Phoebe bournei has been carried out in *** the cultivation process,thinning wood will be *** properties of thinning wood might vary greatly with matured wood and require evaluation for better *** objective of the present study aims to determine the wood structure,fiber morphology,and physical and mechanical properties of the Phoebe bournei thinning wood to help us understand the wood properties and improve its utility *** 14-year-old Phoebe bournei were cut from Jindong Forestry Farm of Hunan Province,*** wood structure and fiber morphology were observed and analyzed with a light microscope and scanning electron *** physical and mechanical properties were tested according to the Chinese national *** results showed as follows:(1)The Phoebe bournei thinning wood has a beautiful wood figure and fine texture,whereas the heartwood has not yet formed.(2)It is a diffuse-porous hardwood with small and less pores as well as fine wood rays.(3)The wood fiber is medium length and extremely thin wall thickness.(4)It is low in density and has excellent dimensionally stability.(5)The wood mechanical properties belong to the low to medium class and the comprehensive strength of wood belongs to the medium-strength *** is concluded that Phoebe bournei thinning wood is suitable for wood carving,handicraft,high-end furniture,and decorative furniture parts.

关键词： Phoebe bournei thinning wood wood structure fiber morphology physical and mechanical property

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Influence of Different Forest Management Techniques on the Quality of wood

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Journal of Renewable Materials 2021年第12期9卷 2175-2188页

作者： Olga Grigoreva Elena Runova Alexei Alyabyev Edward Hertz Anna Voronova Viktor Ivanov Svetlana Shadrina Igor Grigorev Department of Forestry Saint Petersburg State Forest Engineering University named after S.M.KirovSaint-Petersburg194021Russian Department of Forest Crops Breeding and DendrologyBratsk State UniversityBratsk665709Russian Department of Transport and Technological Means and Equipment Forestry Complex Mytischi Branch of Bauman Moscow State Technical UniversityMytischi115533Russian Department of Technologies and Equipment of Timber Industry Ural State Forest Engineering UniversityYekaterinburg620100Russian Department of Applied Mathematics and Cybernetics Petrozavodsk State UniversityPetrozavodsk185910Russian Department of Technology and Equipment for Forestry Production Mytischi Branch of Bauman Moscow State Technical UniversityMytischi141005Russian Department of Technology and Equipment of Forest Complex Arctic State Agrotechnological UniversityYakutsk677007Russian

The issue of accelerated forestry plantation with high-quality wood using the best soils in terms of productivity,fertilizers,and intensive treatment has become quite relevant due to increased demand for forestry products and higher requirements for environmentally friendly use of forest *** paper presents the results of a study on the impact of various techniques for treating coniferous plantations,including thinning,fertilization,and herbicide processing,on wood quality key *** paper examined the wood density,correlation of early and late wood zones,and the cell wall thickness for 38-year-old pine trees grown on the sample plots of Siversky leskhoz(Leningrad region,Gatchinskiy district)at different treatment and density control *** has been established that the highest basis density of wood corresponds to the samples grown at the density variant of 1 t/ha and double herbicides treatment,and the lowest basis density value was recorded at the option of 4 t/ha with combined *** has been shown that the increase of width index for early wood is influenced by the lower density of 1 t/ha and one-time herbicide treatment,for late wood–by the lower density of 1 t/ha and repeated treatment with *** increase in average cell wall thickness for early and late wood is observed when the density increases up to 4 t/ha and double herbicides *** results obtained provide a valuable scientific contribution to general forestry knowledge and have practical value in plantation forestry.

关键词： Agroforestry ecosystem services plantation forestry wood structure planting density

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Effect of thinning intensity on the stem CO_(2) efflux of Larix principis-rupprechtii Mayr

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Forest Ecosystems 2021年第4期8卷 841-855页

作者： Kuangji Zhao Timothy J.Fahey Xiangzhen Wang Jie Wang Fang He Chuan Fan Zhongkui Jia Xianwei Li Sichuan Province Key Laboratory of Ecological Forestry Engineering on the Upper Reaches of the Yangtze River College of ForestrySichuan Agricultural University611130 ChengduChina Key Laboratory for Silviculture and Conservation of the Ministry of Education College of ForestryBeijing Forestry University100083 BeijingChina Department of Natural Resources Cornell University14853 New YorkUSA

Background:Stem CO_(2) efflux(E_(S))plays a critical role in the carbon budget of forest *** is a core practice for sustainable management of *** is therefore necessary and urgent to study the effect and mechanism of thinning intensity(TI)on E_(S).Methods:In this study,five TIs were applied in Larix principis-rupprechtii Mayr 21-,25-,and 41-year-old stands in North China in *** infrared gas analyzer(Li-8100 A)was used to measure ES and its association with environmental factors at monthly intervals from May to October in 2013 to *** addition,nutrients,wood structure and nonstructural carbon(NSC)data were measured in August ***:The results show that ES increased with increasing *** maximum ES values occurred at a TI of 35%(3.29,4.57 and 2.98μmol·m^(-2)·s^(-1))and were 1.54-,1.94-and 2.89-fold greater than the minimum E_(S) value in the CK stands(2.14,2.35 and 1.03μmol·m^(-2)·s^(-1))in July for the 21-,25-and 41-year-old forests,*** E_(S) of the trees in low-density stands was more sensitive to temperature than that of the trees in high-density *** sugars(SS)and temperature are the main factors affecting *** the stand density is low enough as 41-year-old ***-rupprechtii forests with TI 35%,bark thickness(BT)and humidity should be considered in addition to air temperature(T_(a)),wood temperature(T_(w)),sapwood width(SW),nitrogen concentration(N)and SS in the evaluation of *** a change in stand density is ignored,the CO_(2) released from individual 21-,25-and 41-year-old trees could be underestimated by 168.89%,101.94% and 200.49%,***_(2) release was estimated based on the stem equation in combination with the factors influencing ES for ***:We suggest that it is not sufficient to conventional models which quantify ES only by temperature and that incorporating the associated drivers(***,SS,SW and N)based on stand density into conventional model

关键词： Stem CO_(2)efflux Thinning intensity Environmental factors Nutrient content wood structure Nonstructural carbon Larix principis-rupprechtii

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