文献类型：期刊文献

中文题名：广东省3个乡土树种树干密度和木材密度影响因子分析

英文题名：Analysis of the factors affecting trunk density and wood density of three native tree species in Guangdong Province of southern China

作者：徐胜林[1] 何潇[1] 曹磊[1] 李海奎[1] 徐期瑚[2] 刘晓彤[1]

第一作者：徐胜林

机构：[1]中国林业科学研究院资源信息研究所,北京100091;[2]广东省林业调查规划院,广东广州510520

年份：2019

卷号：0

期号：6

起止页码：44-54

中文期刊名：北京林业大学学报

外文期刊名：Journal of Beijing Forestry University

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：国家自然科学基金项目(31770676);广东省林业科技专项(2015-02);广东省林业科技创新平台建设项目(2016CXPT03)

语种：中文

中文关键词：树干密度;木材密度;乡土树种;影响因子;增强回归树(BRT)

外文关键词：trunk density;wood density;native tree species;affecting factor;boosted regression trees(BRT)

分类号：S718.5

摘要：【目的】分析不同因子对树干密度和木材密度的影响,为林木选育、碳汇计量提供数据支撑。【方法】基于广东省樟树、木荷、枫香3个乡土阔叶树种树干密度和木材密度的实测数据,利用含协变量和无交互作用的多因子方差分析法,从5大类30个因子(11个定性因子、19个定量因子)中,筛选出与树干密度和木材密度相关的因子,进而用增强回归树(BRT)来分析不同因子对3个树种树干密度和木材密度影响程度的大小。【结果】(1)植被类型、枝下高、胸径、植被总覆盖度、冠幅东西向宽度是影响樟树树干密度的主要因子,地市、植被类型是影响木荷树干密度的主要因子,坡向、海拔、平均高度为影响枫香树干密度的主要因子;3个树种树干密度的主要影响因子不同,无共同主要影响因子。(2)影响樟树木材密度的主要因子有枝下高、植被类型、海拔、植被总覆盖度、平均高度、灌木盖度、年龄、胸径、林种、土层厚度,影响木荷木材密度的主要因子有年龄、草本盖度、枝下高、平均胸径、土层厚度、植被类型,影响枫香木材密度的主要因子为坡向、海拔、平均高度、枝下高;3个树种木材密度具有共同主要影响因子枝下高,其相对贡献率相近,均在10%左右。(3)林分因子和单木因子同为影响樟树树干密度和木材密度的主导因子,其相对贡献率之和分别为87.04%和76.92%。林分因子、单木因子和地域因子是影响木荷树干密度的主导因子,其相对贡献率之和为79.96%;影响木荷木材密度的主导因子为林分因子、单木因子和土壤因子,其相对贡献率之和为83.04%。地形因子、林分因子和单木因子同是影响枫香树干密度和木材密度的主导因子,其相对贡献率之和分别为83.98%和92.70%。【结论】本文通过多因子方差分析和增强回归树对不同因子进行分析,得出林分因子和单木因子同是影响樟树、木荷、枫香树干密度和木材密度的主导因子。
[Objective]The effects of different factors on trunk density and wood density were analyzed to provide data support for tree breeding and carbon sequestration measurement.[Method]Based on the measured data of trunk density and wood density of Cinnamomum camphora,Schima superba and Liquidambar formosana,which are three native tree species in Guangdong Province of southern China,using multifactor analysis of variance with covariate and no interaction to screen out factors affecting trunk density and wood density from 30 factors(11 qualitative factors and 19 quantitative factors)of five categories,and then the boosted regression trees(BRT)was used to analyze the influence of different factors on trunk density and wood density of three species.[Result](1)Vegetation type,height under branch,DBH,vegetation coverage and the crown width from east to west are the main factors affecting trunk density of Cinnamomum camphora.City and vegetation type are the main factors affecting trunk density of Schima superba.Slope aspect,altitude and average height are the main factors affecting trunk density of Liquidambar formosana.The main factors affecting trunk density of three tree species are different and there was no common main factors in them.(2)The main factors affecting wood density of Cinnamomum camphora are height under branch,vegetation type,altitude,vegetation coverage,average height,shrub coverage,age,DBH,forest category and soil thickness.The main factors affecting wood density of Schima superba are age,herb coverage,height under branch,average DBH,soil thickness and vegetation type.The main factors affecting wood density of Liquidambar formosana are slope aspect,altitude,average height,height under branch.The height under the branch is the common main influencing factor,affecting wood density of the three tree species,and the relative influence upon three tree species was similar,all of which was about 10%.(3)Stand factor and single tree factor are the dominant factors affecting trunk density and wood density of Cinnamomum camphora,and their total relative influence rates were 87.04%and 76.92%,respectively.Stand factor,single tree factor and regional factor are the dominant factors affecting trunk density of Schima superba,and the total relative influence rate was 79.96%.The dominant factors affecting wood density of Schima superba are stand factor,single tree factor and soil factor,and the total relative influence rate was 83.04%.Terrain factor,stand factors and single tree factor are the main factors affecting trunk density and wood density of Liquidambar formosana,and their total relative influence rates were 83.98%and 92.70%,respectively.[Conclusion]This paper analyzes different factors by multifactor analysis of variance and BRT,and it is concluded that stand factor and single tree factor are the dominant factors affecting trunk density and wood density of Cinnamomum camphora,Schima superba and Liquidambar formosana.