摘要
森林可燃物载量分布格局是植被与地形等环境因子之间相互作用的结果。本研究通过野外实测赣南地区主要7种森林类型地表死可燃物载量数据,依据时滞可燃物分类标准,构建了地表可燃物载量与地形、植被等环境因子间的结构方程模型,并分析了各因子的影响路径及其直接、间接和总效应。结果表明:7种不同森林类型中,1、10和100 h时滞可燃物载量均是针阔混交林内最高,毛竹林内最低。对1 h时滞载量影响最大的变量依次为:坡度(影响系数为0.40)>树冠高度(0.07)>树种(-0.03)>郁闭度(0.01);对10 h时滞载量影响最大的变量依次为:胸径(0.15)>树种(-0.09)>坡向(-0.08)>郁闭度(-0.06);对100 h时滞载量影响最大的变量依次为:坡向(0.25)>胸径(0.19)>郁闭度(-0.08)>树种(0.02);对可燃物总载量影响最大的变量依次为:坡度(0.22)>树种(-0.04)、郁闭度(-0.04)>树冠高度(-0.01)。
The distribution pattern of forest fuel loading is driven by the interaction of environmental factors,such as terrain and vegetation.Based on field sampling data of surface dead fuels of seven main forest types in southern Jiangxi Province,and according to the classification standard of different time-lags,we constructed structural equation models to explore the relationship between surface fuel loadings and environmental factors such as terrain and vegetation etc.We analyzed the influence path of each factor and its direct,indirect,and total influence.The results showed that the coniferous and broad-leaved mixed forest had the highest loadings and the Phyllostachys heterocycla pure forest had the lowest loadings for all the 1,10,and 100 h time-lag fuels.The influencing coefficient of environmental factors for 1 h time-lag fuels were ranked as:slope(0.40)>crown height(0.07)>tree species(-0.03)>canopy closure(0.01).For the 10 h time-lag fuels,the environmental factors were ranked as:diameter at breast height(0.15)>tree species(-0.09)>aspect(-0.08)>canopy closure(-0.06).For the 100 h time-lag fuels,the environmental factors were ranked as:aspect(0.25)>diameter at breast height(0.19)>canopy closure(-0.08)>tree species(0.02).The influencing coefficient of environmental factors for the total fuels were ranked as:slope(0.22)>tree species(-0.04),canopy closure(-0.04)>crown height(-0.01).
作者
巫清芸
吴志伟
Robert E.Keane
林世滔
李顺
单延龙
WU Qing-yun;WU Zhi-wei;Robert E.Keane;LIN Shi-tao;LI Shun;SHAN Yan-long(Ministry of Education Key Laboratory of Poyang Lake Wetland and Watershed Research,Jiangxi Normal University,Nanchang 330022,China;Key Laboratory of Natural Disaster Monitoring and Assessment of Jiangxi Province,Jiangxi Normal University,Nanchang 330022,China;School of Geography and Environment,Jiangxi Normal University,Nanchang 330022,China;Missoula Fire Sciences Laboratory,Missoula 5980,United States;Jiangxi Environmental Engineering Vocational College,Ganzhou 341000,Jiangxi,China;College of Forestry,Beihua University,Jilin 132013,Jilin,China)
出处
《应用生态学报》
CAS
CSCD
北大核心
2022年第6期1539-1546,共8页
Chinese Journal of Applied Ecology
基金
国家重点研发计划项目(2018YFE0207800)资助。
关键词
地表死可燃物载量
结构方程模型
路径系数
赣南地区
surface dead fuel loading
structural equation model
path coefficient
southern Jiangxi
作者简介
巫清芸,女,1995年生,硕士研究生。主要从事景观生态学研究。E-mail:349445603@qq.com;通讯作者:吴志伟,E-mail:wuzhiwei@jxnu.edu.cn。
