不同密度下2年生与3年生山桐子苗木质量分析  

Quality Analysis of Two Years Old and Three Years Old Idesia polycarpa Seedlings at Different Densities

作　　者：田凯欣 乔明奎 张梦醒 靳超 李鹏程 刘震[1] 李志 蔡齐飞[1] 耿晓东[1] 王艳梅[1] TIAN Kai-xin;QIAO Ming-kui;ZHANG Meng-xing;JIN Chao;LI Peng-cheng;LIU Zhen;LI Zhi;CAI Qi-fei;GENG Xiao-dong;WANG Yan-mei(College of Forestry/Henan Agricultural University,Zhengzhou 450046,China;State-owned Nanzhao Forest Farm Resource Management Unit,Nanyang 474650,China)

机构地区：[1]河南农业大学林学院,河南郑州450046 [2]国有南召林场资源管理股,河南南阳474650

出　　处：《山东农业大学学报（自然科学版）》2023年第2期238-245,共8页Journal of Shandong Agricultural University：Natural Science Edition

基　　金：国家林业与草原局林业科学技术推广项目:‘豫济’山桐子速生丰产优质栽培技术示范与推广(GTH[2023]02号);2023年河南省专业学位研究生精品教学案例项目:现代森林培育理论与技术(YJS2023AL048)

摘　　要：为探究不同密度下山桐子苗木生长质量的差异,本研究以济源种源山桐子为试验材料,先在穴盘中播种,再按30×20 cm(密度1)、10×20 cm(密度2)、4×20 cm(密度3)3种株行距进行移栽。采用标准行法调查不同密度下2年生与3年生山桐子苗木的质量生长状况。2年生密度1的地径、根幅和主根长度均最大,分别为12.92 mm、47.85cm和27.25 cm,且显著高于密度2和密度3。采用平均值±标准差法对苗木进行分级,得出2年生Ⅰ级苗的标准为苗高>80.83 cm、地径>8.71 mm,且在3个密度中Ⅰ级苗所占比例最大的密度为密度1,占比50.4%,合格苗占比80.8%;3年生密度1的地径、根幅、主根长度和Ⅰ级侧根数均最大,分别为11.73 mm、51.94 cm、34.05 cm和9.00,且显著高于密度2和密度3。采用平均值±标准差法得出3年生Ⅰ级苗的标准为苗高>91.56 cm、地径>10.93 mm,且在3个密度中Ⅰ级苗所占比例最大的密度为密度1,占比54.5%,合格苗占比95.4%。苗木各生长指标之间以及栽植密度与生长指标之间均存在一定相关性,且栽植密度与苗木的苗高和地径存在极显著相关性(P<0.01)。根据苗高和地径两个形态指标,以及将Ⅰ、Ⅱ级苗视为合格苗,其占比之和大于等于80%的密度为较适宜的栽植密度,得出2年生与3年生优质苗木所占比最高的密度均为密度1,且由于密度1密度过小,种间竞争也较小,因此株数保存率最高,为91.7%。综合评定,2年生与3年生山桐子苗木较为合理的栽植密度均为密度1(30×20 cm)。To investigate the differences in the growth quality of Idesia polycarpa seedlings at different densities,this study used Jiyuan seed source Idesia polycarpa as the test material and sowed the seeds in cavity trays before transplanting at three plant spacing of 30×20 cm(density 1),10×20 cm(density 2)and 4×20 cm(density 3).The standard row method was used to investigate the quality growth of 2-year-old and 3-year-old Idesia polycarpa seedlings at different densities.The ground diameter,root width and primary root length of 2-year-old density 1 were the largest with 12.92 mm,47.85 cm and 27.25 cm,respectively,and were significantly higher than those of densities 2 and 3.The seedlings were graded using the mean±standard deviation method,and the criteria for 2-year-old grade I seedlings were seedling height>80.83 cm and ground diameter>8.71 mm,and the density with the largest proportion of grade I seedlings among the three densities was density 1,accounting for 50.4%and 80.8%of qualified seedlings;The ground diameter,root width,primary root length and number of class I lateral roots were the largest in the 3-year-old density 1 with 11.73 mm,51.94 cm,34.05 cm and 9.00,respectively,and were significantly higher than those of density 2 and density 3.The mean±standard deviation method was used to derive the criteria for 3-year old grade I seedlings as seedling height>91.56 cm and ground diameter>10.93 mm,and the density with the largest proportion of grade I seedlings in the seedlings of density 1 was the largest among the three densities,accounting for 54.5%and 95.4%of qualified seedlings.There were correlations among the growth indices of seedlings and between transplanting density and growth indices,and there was a highly significant correlation between transplanting density and seedling height and ground diameter of seedlings(P<0.01).Based on the two morphological indicators of seedling height and ground diameter,and the density that the sum of the ratio of Grade I and II seedlings as qualified seedlings is grea

关 键 词：山桐子 树木密度 苗木分级 

分 类 号：S723.4[农业科学—林木遗传育种]