广西林业科学2024，Vol.53Issue(6)：738-745,8.DOI:10.19692/j.issn.1006-1126.20240607
干旱胁迫对江南油杉幼苗生长和根系构型的影响
Effects of Drought Stress on Growths and Root Architectures of Keteleeria fortunei var.cyclolepis Seedlings
摘要
Abstract
To provide theoretical support for drought resistance strategies and water management during seed-ling stage of Keteleeria fortunei var.cyclolepis,two-year-old K.fortunei var.cyclolepis seedlings were used as ex-perimental materials.Five drought gradients[75%-80%(CK),55%-60%(T1),35%-40%(T2),15%-20%(T3)and continuous without water(T4)]and two time gradients(7 and 28 days)were established.Two-factor experi-ment was conducted to analyze change rules of seedling growth indexes and root plane geometry architecture and stereo geometry architecture of K.fortunei var.cyclolepis seedlings in drought stress.Results showed that on the 7th day of drought stress,with increase of drought stress degree,seedling height,ground diameter,root bio-mass,above ground biomass and total biomass showed trends of first increase and then decrease,while root to shoot ratio exhibited"M"shape trend.T1 treatment significantly promoted seedling growth.Root length,root surface area,root volume,average root diameter and root tip number showed trends of first increase and then de-crease with all indexes being the highest in T1 treatment.Specific root length and specific surface area exhibit-ed"W"shape trends with specific root length being the highest in T2 treatment and specific root length and spe-cific surface area being the lowest in T1 treatment.On the 28th day of drought stress,with increase of drought stress degree,seedling height,ground diameter,root biomass,above ground biomass and total biomass de-creased,while root to shoot ratio showed trend of decrease.T4 treatment significantly inhibited seedling growth.Root length,root surface area,root volume,average root diameter,root tip number,specific root length and spe-cific surface area showed trends of decrease with all indexes being the lowest in T4 treatment.Root architec-tures of K.fortunei var.cyclolepis seedlings were fishtail branching pattern under different time and drought stresses.Overall,K.fortunei var.cyclolepis seedlings in T1 treatment on the 7th day of drought stress performed the best,while those in T4 treatment on the 28th day of drought stress performed the worst.Maintaining soil wa-ter content at 55%-60%for 7 days was conducive to cultivate high-quality and robust K.fortunei var.cyclolepis seedlings.关键词
森林培育/干旱胁迫/生长指标/根系构型/江南油杉Key words
forest cultivation/drought stress/growth index/root architecture/Keteleeria fortunei var.cyclolepis分类
农业科技引用本文复制引用
潘淑民,蒋燚,刘菲,李伟彬,庞艳萍,刘雄盛,姜英,李娟,马金满,王凌晖..干旱胁迫对江南油杉幼苗生长和根系构型的影响[J].广西林业科学,2024,53(6):738-745,8.基金项目
广西自然科学基金项目(2018GXNSFBA294012) （2018GXNSFBA294012）
中央财政林业科技推广示范项目([2021]TG19号) （[2021]TG19号）
