密度和行距配置对毛白杨苗木质量的影响  

Effects of Density and Row Spacing on the Quality of Populus tomentosa Seedling

作　　者：孙明慧 刘勇[1] 王长伟 李国雷[1] 王苗苗 宋协海 常笑超 万芳芳[1] 宋怀山 Sun Minghui;Liu Yong;Wang Changwei;Li Guolei;Wang Miaomiao;Song Xiehai;Chang Xiaochao;Wan Fangfang;Song Huaishan(Key Laboratory for Silviculture and Conservation of Ministry of Education,Beijing Forestry University,Beijing 100083;East China Inventory and Planning Institute,National Forestry and Grassland Administration,Hangzhou 310019;Guanxian State-Owned Nursery National Poplar Forest Base,Liaocheng 252500)

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室,北京100083 [2]国家林业和草原局华东调查规划设计院,杭州310019 [3]冠县国有苗圃国家杨树良种基地,聊城252500

出　　处：《林业科学》2021年第3期152-160,共9页Scientia Silvae Sinicae

基　　金：国家重点研发课题“白杨工业资源材高效培育技术研究”(2016YFD0600403)。

摘　　要：【目的】探究密度和行距配置对毛白杨苗木生长、养分含量和光截获的影响,筛选毛白杨苗木适宜的密度和行距配置,为提高毛白杨苗木质量、节约毛育苗成本提供参考。【方法】以毛白杨新品种“北林雄株1号”苗木为试验材料,采用双因素完全随机区组设计,设置高、中、低3种育苗密度[50000(A1)、41667(A2)和31250(A3)株·hm^(-2)]和3种行距配置[行状配置B_(1)(行距0.8 m)、带状配置B2(2行1带,窄行距0.6 m+宽行距1.0 m)和带状配置B3(2行1带,窄行距0.4 m+宽行距1.2 m],测定毛白杨苗木生长指标、养分含量、光截获和叶面积指数。【结果】1)密度和行距配置对毛白杨苗木生长指标影响显著(P<0.05),中密度带状配置A2B3的苗高、根生物量和总生物量最大,分别为294.65 cm、151.92 g和328.77 g,较高密度行状配置A1B_(1)分别提高30.21%、62.78%和26.96%;2)密度和行距配置显著影响毛白杨叶氮浓度,A3B3的叶氮浓度最大(16.43 g·kg^(-1));带状配置较行状配置可显著提升苗木茎根的氮浓度;3)密度和行距配置的交互作用对毛白杨苗木光截获影响不显著(P>0.05),行距配置对毛白杨苗木光截获和叶面积指数影响极显著(P<0.01),带状配置显著增加毛白杨苗木光截获和叶面积指数,带状配置B3的光截获和叶面积指数最大,分别为0.87和3.59,显著高于行状配置B_(1);4)不同密度和行距配置下,光截获显著影响毛白杨生长指标(P<0.05),光截获与毛白杨苗高、地径、地上生物量、地下生物量和总生物量呈极显著正相关(P<0.01),与茎根比呈显著负相关(P<0.05),其中光截获与生物量的决定系数(R2)最高,达0.408。【结论】在不同密度和行距配置下,光截获是影响苗木苗高、地径、地上生物量、地下生物量和总生物量的关键因素。密度和行距配置不同,苗木生长指标以及养分浓度均表现出相应变化。从苗木质量上考虑,中密度带状配置B3毛白杨�【Objective】The quality of seedlings directly affects the outplanting performance,and the density and row spacing configuration of seedlings affect seedling quality and yield.This study aimed to explore Populus tomentosa seedling growth,nutrient content and light interception in response to density and row spacing,and to select the suitable density and row spacing of P.tomentosa seedlings,in order to improve the quality of P.tomentosa seedlings and save the cost.【Method】In this paper,three seedling densities(50000(A1),41667(A2),31250(A3)seedlings·hm^(-2))and three kinds of row spacing(uniform row B_(1)(row spacing 0.8+0.8 m),the narrow-wide rows B2:(row spacing 0.6+1.0 m),and the narrow-wide rows B3:(row spacing 0.4+1.2 m)were designed to explore the effects of seedling density and row spacing on growth,nutrient content,light interception of P.tomentosa.【Result】1)Density and row spacing had significant effects on seedling growth indexes.The seedling height,root biomass and biomass of A2B3 were the highest,with 294.65 cm,151.92 g and 328.77 g,respectively.2)Density and row spacing had significant effects on leaf nitrogen concentration of P.tomentosa seedlings.The leaf nitrogen concentration of A3B3 was the highest with a value of 16.43 g·kg^(-1).Narrow-wide row planting significantly increased the nitrogen concentration in seedling stems and roots compared with equidistant row planting.3)The interaction of density and row spacing configuration had no significant effect on canopy light interception(P>0.05).However,row spacing significantly affected light interception and leaf area index(LAI)of P.tomentosa seedlings(P<0.01).Narrow-wide rows 2 significantly increased light interception and leaf area index of P.tomentosa.The light interception and leaf area index of treatment B3 were the highest,which were 0.87 and 3.59,significantly higher than those of treatment B_(1).4)Under different density and row spacing,light interception significantly affected the growth index of the seedlings(P<0.05).Light inter

关 键 词：毛白杨 生长指标 养分浓度 光截获 叶面积指数 

分 类 号：S718.43[农业科学—林学]