摘要
试验将1年生实生核桃苗分为0.5~0.8 cm、0.8~1.0 cm、>1.0 cm 3个径级进行移栽,通过移栽苗的成活率、苗高、地径生长,来研究径级与其生长的关系。结果表明:1)径级对移栽苗成活率的影响,表现出苗木规格越大,成活率越高;以地径>1.0 cm(Ⅲ)成活率最高,为83.75%;<1.0 cm(Ⅳ和Ⅴ)成活率低于80%。2)苗高、地径总生长量从大到小依次为:Ⅲ(苗高100.4 cm、地径1.984 cm)>Ⅳ(苗高68 cm、地径1.658 cm)>Ⅴ(苗高62.8 cm、地径1.385 cm)。3)苗高、地径生长动态趋势均呈"S"型趋势,地径的生长总体呈现"慢-快-慢"的生长规律;从生长量看,苗高以径级大的为好,Ⅴ、Ⅲ移栽后苗高生长增幅速度最大(分别为218%、214.96%);而地径生长以Ⅴ的增幅速度最大(225%),Ⅲ、Ⅳ较小(分别为186.29%、146.96%)。4)苗木总生物量,以大径级最大(100.47 g),且随着径级的增大而增加。5)按照核桃苗木分级标准,Ⅲ和Ⅳ的合格苗比例较大(分别为93.94%、80%),Ⅴ的合格苗最少(50%)。综合各项指标,Ⅲ径级在苗高、地径、生物量和出圃苗合格率上均高于其他两种径级,说明1.0 cm可作为进行二次移栽的最小地径苗木标准。
Annual walnut seedlings were divided into three diameter classes to transplant in the test,the relationship between diameter classes and the growth of transplanted seedlings are studied via investigating the survival rate,the seeding height and the ground diameter.The results indicated that 1)The larger specifications of walnut seedlings,the higher survival rate of transplanted seedlings.The highest survival rate(83.75%)was shown in groupⅢwhen the ground diameter was greater than 1.0 cm,and the survival rate of groupⅣand groupⅤwere not more than 80%when the ground diameter was less than 1.0 cm.2)The seeding height and the total growth of ground diameter declines from 100.4 cm and 1.984 cm in groupⅢto 68 cm and 1.658 cm in groupⅣand even to 62.8 cm and 1.385 cm in groupⅤ.3)The dynamic growth tendency of the seeding height and the ground diameter shows like"S".The ground diameter presented slow-fast-slow growth pattern.Analyzed from the increment,the larger of the diameter,the higher of the seedling.GroupⅤandⅢshowed the largest amplification of seedling height growth(218%,214.96%)and GroupⅤexhibited the larger amplification of basal growth(225%)than groupⅢandⅣ(186.29%and146.96%).4)The biomass was decided by diameter classes and increases with the growth of diameter classes,the largest biomass was 100.47 g.5)GroupⅢandⅣpresent the larger qualified ratio of seedlings(93.94%and 80%),but groupⅤshowed the least(50%).GroupⅢtaking into consideration various indicators,showed better height,diameter,biomass and qualified ratio than other specifications wich indicated that 1.0 cm could be choose to act as the seedling criterion of the minimum ground diameter for the secondary transplanting seedlings.
作者
徐凯
夏玉芳
覃建文
XU Kai;XIA Yufang;QIN Jianwen(Shanxi General Station of Forestry Technology Promotion and Economic Forest Management,Taiyuan 030000,China;College of Forestry,Guizhou University,Guiyang 550025,China;Forestry Bureau of Ceheng County in Guizhou,Ceheng 552200,China)
出处
《果树资源学报》
2020年第5期14-18,共5页
Journal of Fruit Resources
关键词
核桃移栽苗
成活率
苗高
地径
生物量
transplanted walnuts seedlings
survival rate
seeding height
ground diameter
biomass
