不同密度12年生杉木林地上部分生物量的垂直分布  

Vertical spatial distribution of aboveground biomass of 12-year-old Chinese fir(Cunninghamia lanceolata)plantation with different densities

作　　者：李玲燕 代林利 刘丽[1] 叶义全[1,2] 何宗明 曹光球[1,2] LI Lingyan;DAI Linli;LIU Li;YE Yiquan;HE Zongming;CAO Guangqiu(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;Engineering and Technology Research Center of Chinese Fir,National Forestry and Grassland Administration,Fuzhou,Fujian 350002,China)

机构地区：[1]福建农林大学林学院,福建福州350002 [2]国家林业草原杉木工程技术研究中心,福建福州350002

出　　处：《亚热带农业研究》2020年第4期229-236,共8页Subtropical Agriculture Research

基　　金：国家重点研发计划项目(2016YFD0600301)。

摘　　要：[目的]探究12年生不同造林密度杉木人工林地上部分生物量差异及垂直空间分布规律。[方法]以12年生3种造林密度(1800、3000、4500株·hm^-2)杉木林为研究林分,通过野外调查及室内测定林分乔木层、林下植被层和凋落物层生物量,探析杉木林地上部分生物量的垂直空间分布规律。[结果]杉木人工林树干、树皮、宿留枯枝、宿留枯叶和林下凋落物生物量随造林密度的增大而提高。杉木鲜枝和鲜叶生物量随造林密度的增大呈先升后降的趋势,而林下植被生物量则呈下降趋势。就同一密度而言,树皮和树干的生物量在0~2 m区段达到最大值,宿留枯枝和宿留枯叶的生物量在4~8 m区段达到最大值,鲜枝和鲜叶的生物量在8~10 m区段达到最大值。乔木层地上部分是杉木人工林氮储量的主体,造林密度为1800株·hm^-2的杉木人工林生物量表现为:乔木层地上部分>林下植被层>凋落物层;3000、4500株·hm^-2的林分则表现为:乔木层地上部分>凋落物层>林下植被层。[结论]在一定造林密度范围内,杉木人工林乔木层和凋落物层生物量随造林密度的增大而提高,林下植被层生物量随造林密度的增大而降低。在一定的垂直空间范围内,杉木人工林树干和树皮的生物量随高度升高而降低,而宿留枯枝、宿留枯叶、鲜枝和鲜叶的生物量随垂直空间高度的升高呈先升后降的趋势。[Purpose]To explore the difference in aboveground biomass and vertical spatial distribution among 12-year-old Cunninghamia lanceolata plantations with different densities.[Method]Taking 12-year-old pure C.lanceolata plantations with three afforestation densities(1800,3000,4500 plants·hm^-2)as the research stands,the vertical spatial distribution of biomass in the upper part of C.lanceolata forests was analyzed through field investigation and indoor measurement of biomass in the arbor layer,understory vegetation layer,and litter layer of the stands.[Result]The biomass of trunk,bark,remaining dead branches and dead leaves,and understory layer of the C.lanceolata plantation forests increased with the increase of forestation density.The biomass of fresh branches and leaves of C.lanceolata increased first and then decreased with the increase of afforestation density,while the biomass of understory vegetation showed a downward trend.At the same density,the biomass of bark and trunk reached the maximum in the 0-2 m range.The biomass of the remaining dead branches and dead leaves reached the maximum in the 4-8 m range.The biomass of fresh branches and fresh leaves reached the maximum in the range of 8-10 m.The aboveground part of tree layer is the main part of nitrogen storage of C.lanceolata plantation.The biomass of C.lanceolata plantation with planting density of 1800 plants·hm^-2 is as follows:above-ground part of tree layer>understory vegetation layer>litter layer;the biomass of C.lanceolata plantation with planting density of 3000 and 4500 plants·hm^-2 is as follows:above-ground part of tree layer>litter layer>understory vegetation layer.[Conclusion]Within a certain afforestation density range,the biomass of the above-ground tree layer and litter layer of the C.lanceolata plantations increased with the increase of the afforestation density,while the biomass of the understory vegetation layer decreased with the increase of the afforestation density.Within a certain vertical spatial space,the biomass of the trunk

关 键 词：杉木人工林 林分密度 生物量 垂直空间 分布规律 

分 类 号：S791.27[农业科学—林木遗传育种]