基于通径分析的杉木林空间结构与土壤养分关系研究  

Research on the relationship between spatial structure and soil nutrients of Cunninghamia lanceolata forest based on path analysis method

作　　者：孙宇 李际平[1] 曹小玉[1] 颜佳睿 SUN Yu;LI Jiping;CAO Xiaoyu;YAN Jiarui(College of Forestry,Central South University of Forestry&Technology,Changsha 410004,Hunan,China)

机构地区：[1]中南林业科技大学林学院,湖南长沙410004

出　　处：《中南林业科技大学学报》2020年第7期41-47,共7页Journal of Central South University of Forestry & Technology

基　　金：湖南省自然基金项目(2018JJ2673);国家“十二五”科技支撑项目(2012BAD22B0505)。

摘　　要：【目的】研究杉木林空间结构对土壤养分的影响,探讨各空间结构因子对土壤养分指标的作用机理及其关系。【方法】以湖南省福寿林场内的杉木林为研究对象,选择幼龄林、中龄林、近熟林3个龄组的杉木人工林,运用通径分析法,对林分各空间结构因子和土壤养分之间关系进行分析。【结果】林层指数对土壤有机质含量、全N含量、全K含量具有较强的直接影响,林层指数对有机质含量(直接通径系数为1.09)产生了绝对值最大的直接正效应,对全K含量(直接通径系数为-1.022)产生直接负效应,全混交度对全K含量(直接通径系数为1.196)和全P含量(直接通径系数为0.778)具有较强的直接影响。影响土壤全P的主要因素依次为全混交度、开阔比数和林层指数。各空间结构因子对全N的直接影响效应较小。【结论】杉木林各空间结构因子通过直接和间接作用共同影响了土壤养分,其影响机理各不相同,总体来看,林层指数和全混交度对土壤养分的直接影响最大。其他空间结构因子通过间接作用对土壤养分产生影响。【Objective】To study the effect of spatial structure on soil nutrients in Cunninghamia lanceolata forest,and to explore the mechanisms and relationships of spatial structure factors on soil nutrient indicators.【Method】Taking the Cunninghamia lanceolata forestin Fushou forest farm of Hunan province as the research object,three age groups of young forest,middle-aged forest and nearmature forest plantation were selected.Path analysis method was used to analyze the relationships between spatial structure and soil nutrients.【Result】Forest layer index had a strong direct impact on soil organic matter content,total N content and total K content.Forest layer index had the largest direct positive effect on the absolute value of organic matter content(direct path coefficient was 1.09),had a direct negative effect on total K content(direct path coefficient was-1.022),and total mixing degree had a direct negative effect on total K content(direct path coefficient was 1.022).The total mixing degree has a strong direct impact on the total K content(direct path coefficient is 1.196)and total P content(direct path coefficient is 0.778).The main factors affecting soil total P were total mixing degree,open ratio and forest layer index in turn.The direct effect of each spatial structure factor on total N is small.【Conclusion】The spatial structure factors of Cunninghamia lanceolata forest affect soil nutrients through direct and indirect effects,and their influencing mechanisms are different.On the whole,forest layer index and total mixing degree have the greatest direct impact on soil nutrients.Other spatial structural factors affect soil nutrients indirectly.

关 键 词：杉木林 林分空间结构 土壤养分 通径分析 

分 类 号：S791.27[农业科学—林木遗传育种]