控根对湿加松扦插苗生长与根系形态的动态影响
收稿日期: 2019-03-26
修回日期: 2019-04-25
网络出版日期: 2020-09-25
基金资助
国家重点研发计划课题“湿地松等国外松脂材兼用林高效培育技术研究”(2017YFD0600502)
Dynamic Effects of Root Pruning on Growth and Root Morphology in P.elliottii×P.caribaea Cuttings
Received date: 2019-03-26
Revised date: 2019-04-25
Online published: 2020-09-25
以湿加松扦插容器苗为材料,设置空气切根(30,50,70 cm苗床)和不切根对照处理,分析处理后半年内株高、地径、地上部生物量、根系生物量、根长、根表面积、根直径、细根比例等指标的月变化。结果表明,控根影响了扦插苗的根系形态,但对扦插苗的生长与生物量无显著影响。处理4个月后,70 cm苗床的切根处理显著促进了根系的伸长生长,但5个月时,切根苗木的根系转向粗生长的阶段,与对照相比,细根比例降低,而根直径增大。苗木生长量呈现与根直径的相关性逐渐增强、而与根长度相关性减弱的趋势,表明控根苗木根系形态的动态变化有利于促进苗木的生长。建议采用70 cm苗床做湿加松扦插苗的空气切根。
林昌明 , 彭冠明 , 黄增悦 , 黄婷 , 司徒荣贵 , 李振 , 郭文冰 , 赵奋成 . 控根对湿加松扦插苗生长与根系形态的动态影响[J]. 林草资源研究, 2019 , 0(3) : 118 -123 . DOI: 10.13466/j.cnki.lyzygl.2019.03.020
The container grown cuttings of P.elliottii×P.caribaea were cultured with air root pruning(RP) or without(control).The height of the raised bed were 30 cm,50 cm and 70 cm for the RP cuttings,respectively.The parameters including height,ground diameter,shoot biomass,root biomass,root length,root surface area,root diameter and fine root ratio,were monitored monthly within half a year.Although the root morphology was affected,no significant effects were found on cutting growth and biomass by root pruning.The root length was significantly increased in the RP cuttings at 70 cm-height bed 4 months after treatment.However,the root system of the RP cuttings changed from elongation to diameter growth.The fine root ratio decreased,and the root diameter increased compared to the control.The correlation between the growth and root diameter increased gradually,whereas the correlation between the growth and root length tended to decrease.It was implied that the changes in root morphology in RP cuttings would benefit the cutting growth.It is recommendes to use 70 cm-height bed for air root pruning for P.elliottii×P.caribaea cuttings.
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