摘要
以1年生柠条(Caragana korshinskii)幼苗为材料,研究了不同浓度多效唑处理对柠条幼苗株高、基径、分枝数、分枝角度等地上部分和根系特征参数等地下部分的影响,分析不同浓度处理之间柠条幼苗构型指标的差异。结果显示:随多效唑处理浓度的增加,柠条幼苗株高增长量显著减少、基茎增长量显著增加;分枝数和分枝角度随处理浓度的增加呈现先增加后降低的趋势,400mg·L^(-1)浓度处理使幼苗根系表面积显著增大,根系分级数和各级根系数量增加,表明施用适宜浓度多效唑能够矮化柠条幼苗,增粗基茎,促进分枝、扩大分枝角度,增大柠条幼苗单位面积地表覆盖;同时,能够拓展地下根系的分布面积,增加各级根系数量;综合考虑,在调控柠条幼苗空间构型方面,适宜的多效唑处理浓度为300~400mg·L^(-1)。
The experiments were conducted to study the effects of paclobutrazol with different concentrations on the architecture characteristics of Caragana korshinskii seedlings,such as the plant height,the basal diameter,the branching number,the branching angle,and contrasted the differences betweent growth characteristics among various concentrations. The results showed that,with the increasement of treatment concentration,the variation of the plant height was decreased and the stem was significantly enhanced; the branching number and the angle increased initially,and then decreased with the increasement of treatment concentration. When the concentration was 400mg·L^（-1）,the root surface area increased significantly,and the numbers of roots and root system classification increased. The suitable concentration of paclobutrazol dwarfed the plant height,thickened the plant stem,promoted the plant branching,expanded the branching angle,increased the plant surface coverage; meanwhile,the suitable concentration of paclobutrazol expanded the distribution area of the underground root and increased the number of roots. Overall consideration,to improve the plant architecture of desert shrub,the appropriate application concentration of paclobutrazol is 300 ~ 400mg·L^（-1）.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2017年第12期184-188,共5页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(31500586)
中央级公益性科研院所基本科研业务费专项(CAFYBB2016QB015)
引进国际先进林业科学技术项目(2015-4-22)资助
关键词
多效唑
柠条
枝系构型
根系构型
paclobutrazol
Caragana korshinskii
branching architecture
root architecture
