不同林分类型叶面积指数与地形因子相关性研究  

Study on Relationship of Topographic Factors and Leaf Area Index in Different Forest Types

作　　者：杨焕金 彭博[2] 范慧涛 谷建才[2] 李瑞平[1] 李维泉 YANG Huan-jin;PENG Bo;FAN Hui-tao;GU Jian-cai(Forestry and Fruit Technology Extension Station of Baoding,Baoding,Hebei 071051,China;Agricultural University of Hebei,Baoding,Hebei 071000,China)

机构地区：[1]保定市林业局林果技术推广站,河北保定071051 [2]河北农业大学林学院,河北保定071000

出　　处：《河北林业科技》2018年第3期1-6,共6页Journal of Hebei Forestry Science and Technology

基　　金：河北省林业厅科研项目

摘　　要：该文以承德塞罕坝地区的针叶林、阔叶林和针阔混交林3种林分类型为研究对象,在标准地调查的基础上分析地形因子对各林分类型叶面积指数(LAI)的影响,并建立相关模型。结果表明:坡度、海拔对各林分类型叶面积指数的影响不显著(P>0.05),坡向对各林分类型叶面积指数具有显著影响(P<0.05);就坡度而言,各等级林分LAI均值大小为缓坡>斜坡>陡坡>平坡;就坡向来看,各等级林分LAI均值大小为阴坡>半阳坡>阳坡>半阴坡;从海拔看,各等级林分LAI均值大小为Ⅰ级>Ⅱ级>Ⅲ级>Ⅳ级;且同一等级各林分类型叶面积指数从大到小均为阔叶林>针阔混交林>针叶林。F值检验表明:坡度、坡向、海拔三大地形因子分别与各林分类型叶面积指数模型拟合效果较好,且R2>0.7。将各林分类型LAI与地形因子综合分析得出影响林分LAI最大的是坡向,最小的是坡度。通过拟合模型,了解不同林分类型及同一林分类型与地形因子间关系,为塞罕坝地区叶面积指数求算提供理论基础。Coniferous forest、 broadleaved forest、conifer and broad-leaved mixed forest in three types of conifer-ous forest,broad-leaved forest and mixed needle-width forest in chengde saihanba area were selected as re-search objects. The influence of topographic factors on leaf area index of different forest types was analyzed andthe correlation model was established. The results show that： the influence of slope and elevation on leaf areaindex of different forest types was not significant（P〉0.05） . Slope direction had significant influence on leaf areaindex of each forest type（P〈0.05） ; In terms of slope,the average value of LAI for each grade is： gentle slope〉slope〉steep slope〉flat slope; In terms of the slope direction,the average value of LAI for each grade is： shadyslope〉semi-sun slope〉sunny slope〉semi-shain slope; From the elevation point of view,the average value of the LAIof each grade forest is： I level〉II level〉III level〉IV level; The leaf area index of each forest type of the same gradeis： broad-leaved forest〉coniferous and broad-leaved mixed forest〉coniferous forest. The F-value test showed that thetopographical factors of slope,aspect and elevation were better fitted with the leaf area index model of each foresttype,and R2〉0.7. A comprehensive analysis of the forest type LAI and topographic factors shows that thelargest impact on the stand LAI is the slope direction,and the smallest is the slope. By fitting the model,wecan understand the relationship between different forest types and the same forest type and topographical fac-tors,and provide a theoretical basis for the calculation of leaf area index in Saihanba area.

关 键 词：叶面积指数 坡度 坡向 海拔 

分 类 号：S75[农业科学—森林经理学]