【作者】 于雷；

【导师】 贾炜玮；

【作者基本信息】 东北林业大学 ， 森林经理学， 2021， 硕士

【摘要】 本研究以东北地区林口林业局红松人工林为研究对象,按不同抚育强度(重度间伐:株数强度65%,蓄积强度43%、中度间伐:株数强度50%,蓄积强度28%和轻度间伐:株数强度40%,蓄积强度18%、对照)将样地划分为4个等级。将红松人工林的林木生长、树干状况、分枝情况三大评价因素,包括树高平均生长量、胸径年均生长量、冠径比、高径比、尖削度、分杈率、疏松节比例、自然整枝能力、侧枝数(>1.5cm)、枝粗指数、侧枝平均基径1 1项指标作为红松林木形质评价指标。采用层次分析法作为主要分析方法建立关于红松人工林层次结构模型和评价指标体系,对不同抚育强度下的红松人工林的形质影响进行综合评价。结果表明中度间伐的林木形质综合得分最高为73.427,表现为林木形质最好,形质评价等级为Ⅱ级。重度间伐林木形质的综合得分为68.114形质评价等级为Ⅲ级,轻度间伐林木形质得分为59.150形质评价等级为Ⅳ级;对照组林木形质综合得分为43.432形质评价等级为V级。达到郁闭情况下的红松林通过适当的抚育间伐能够改善保留木的生境,其中中度间伐强度下林木形质状况最优,重度间伐次之,轻度间伐最小。树干情况对红松林木形质的影响最大,由形质指标判断矩阵可得出约占65.5%的比例,可为东北地区红松人工林以及其他针阔叶树种的林木形质评价以及红松人工林的地方生产抚育间伐提供理论依据。更多还原

【Abstract】 Taking Pinus koraiensis plantation of Linkou Forestry Bureau in Northeast China as the research object,the plots were divided into four grades according to different thinning intensities(heavy thinning:plant number intensity 65%,accumulation intensity 43%,medium thinning:plant number intensity 50%,accumulation intensity 28%,and light thinning:plant number intensity 40%,accumulation intensity 18%).Three evaluation factors for growth situation,stem shape and branching conditions,including height mean increment,DBH mean annual increment,crown diameter ratio,ratio of height to diameter,tree tapering,Bifurcation ratio,loose knot ratio,natural ability of self-thinning,lateral branch number(>1.5cm),Index of branch diameter,average base diameter of branches were used as the evaluation indicators for Pinus koraiensis form quality.Analytic Hierarchy Process(AHP)was used as the main analysis method to establish the hierarchy structure model and evaluation index system of Pinus koraiensis plantations,and comprehensively evaluate the form quality of the Pinus koraiensis plantations under different thinning intensities.The highest comprehensive form quality score of 73.427 was obtained for medium thinning,which showed the best form quality that the quality evalution grade is Ⅱ,68.114 for heavy thinning with grade Ⅲ,59.150 for light logging with grade Ⅳ,and 43.432 for the control group with grade V.The control group had an comprehensive form quality score of 43.432 with gradeV.The habitat of reserved trees in canopy closure Pinus koraiensis plantations can be improved by proper thinning,among which,the form quality of trees reflected by medium thinning is the best,followed by heavy thinning and the least by light thinning.The tree stem condition has the greatest influence on the Pinus koraiensis form quality.The character index of judgment matrix can be concluded that accounts for about 65.5%of the proportion,which can provide a theoretical basis for the evaluation of the tree form quality of Pinus koraiensis plantations and other coniferous and broad-leaved species in Northeast China,as well as local production and thinning of Pinus koraiensis plantation.更多还原