不同类型马尾松混交林结构与水源涵养功能的耦合关系  

Coupling Relationship Between the Structure and Water Conservation Function of Different Mixed Forests of Pinus massoniana

作　　者：陈歆宇 谭伟[2] 杨深钧 CHEN Xinyu;TAN Wei;YANG Shenjun(College of Forestry,Guizhou University,Guiyang,Guizhou 550025,China;Research Center of Forestry Information Engineering,Guizhou University,Guiyang,Guizhou 550025,China)

机构地区：[1]贵州大学林学院,贵阳550025 [2]贵州大学林业信息工程研究中心,贵阳550025

出　　处：《水土保持研究》2023年第5期217-222,共6页Research of Soil and Water Conservation

基　　金：贵州省科技支撑计划项目“黔中马尾松可持续经营研究与示范”(黔科合支撑[2017]2520-1号)资助。

摘　　要：[目的]研究马尾松混交林林分结构与水源涵养功能之间的耦合关系,旨在探讨合理的马尾松混交林类型、混交比例及林分结构,为混交林可持续发展和提高森林水源涵养能力提供理论依据。[方法]以贵州省黎平县德顺乡的马尾松混交林为研究对象,对其中典型马尾松×阔叶混交林、马尾松×杉木混交林、马尾松纯林(对照)共15块样地进行立地因子和林木因子进行调查。根据获取的调查数据,对平均胸径、平均树高、枯落物最大持水量、枯落物现存量等9种林分结构因子进行主成分分析,并利用降维后的主成分因子与水源涵养功能进行耦合分析按照建立的林分结构与功能的耦合关系模型,对混交林林分水源涵养功能进行评价。[结果]不同类型林分土壤层厚度、灌草盖度、土壤孔隙度、土壤持水量差异不明显(p>0.05),但样地枯落物现存量、枯落物平均最大持水率、枯落物平均最大持水量、枯落物厚度差异显著(p<0.05)。建立了林分结构与水源涵养功能的耦合线性模型,其中影响林分水源涵养功能的指标主要为林分的平均胸径、平均树高、林分密度指数、树种组成等林分结构指标和枯落物现存量、枯落物最大持水量、枯落物最大持水率等涵养水源功能指标,枯落物最大持水量权重占比最大为14.4%。调查林分水源涵养功能评价值表现为:马尾松×木荷>马尾松×米槠>马尾松×杉木>纯林。[结论]马尾松阔叶混交林水源涵养功能优于马松针叶混交林和纯林,密度为750株/hm 2,郁闭度0.7混交比例为1∶2或2∶1的马尾松—木荷混交林是贵州省黎平县所调查研究区域中水源涵养功能最佳的林分结构。[Objective]The coupling relationship between stand structure and water connotation function of Pinus massoniana mixed forests was examined in order to figure out the reasonable types of P.massoniana mixed forests,mixing ratio and stand structure,and provide the theoretical basis for sustainable development of mixed forests and improving water conservation capacity of forests.[Methods]The site factors and stand factors of 15 typical masson's pine-broadleaf mixed forests,masson's pine-Chinese fir mixed forest and Masson's pine pure forest(control)were investigated in Deshun Township,Liping County,Guizhou Province.According to the obtained survey data,principal component analysis was used to analyze 9 kinds of forest structure factors,including average DBH,average tree height,maximum water holding capacity of litter and existing litter,and coupling analysis between the principal component factors with dimensionality reduction and water conservation function was carried out.According to the coupling relationship model of forest structure and function,the water conservation function of mixed forest was evaluated.[Results]There were no significant differences in soil thickness,shrub cover,soil porosity and soil water holding capacity among different forest types(p>0.05),but there were significant differences in the existing litter stock,average maximum litter holding capacity,average maximum litter holding capacity and thickness of litter in the sample plots(p<0.05).The coupling linear model of stand structure and water conservation function was established,in which the main indexes affecting the functional of water conservation were stand structure indexes such as average DBH,average tree height,stand density index,tree species composition,and water conservation function indexes such existed litter stock,maximum litter water holding capacity and maximum litter water holding rate.The weighted ratio of the maximum water holding capacity of litter was 14.4%.The water conservation function evaluation values of the investi

关 键 词：马尾松混交林 林分结构 涵养水源功能 耦合模型 综合评价 

分 类 号：S718.5[农业科学—林学]