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    • 种子散布位置对格氏栲幼苗根系形态及生长特征的影响

    ZHU Jing,LIU Jinfu, XING Cong,JIANG Lan,WANG Xuelin,HE Zhongsheng,SHI Youwen,SHEN Caixia

    Acta Ecologica Sinica（2022）

    Cited 1|Views7
    Abstract
    种子从母株掉落于地面萌发后,其根系在不同散布位置(凋落物上层、土壤表层和凋落物下层)的生长形态影响幼苗定居及建成,而目前对其根系形态及生长特征的了解并不充分,限制了对幼苗根系在不同散布下适应策略的理解.为此,以格氏栲(Castanopsis kawakamii)为研究对象,通过模拟种子在凋落物中位置,设置凋落物上层(种子下层铺垫2 cm和4 cm凋落物,U2和U4处理)、土壤表层与凋落物下层(种子上层覆盖0、2、4、6 cm和8 cm凋落物,CK、D2、D4、D6和D8处理)等3种散布,探讨不同散布位置对格氏栲幼苗根系9个生长指标的影响.结果表明:(1)种子散布位置对幼苗根干物质质量具有显著影响,D2处理达最大值.(2)D2处理的幼苗根长、根表面积、根尖数、分枝数和比根长高于其它处理;根系平均直径在D6处理达最大值.(3)相关分析表明根长、根表面积、根尖数、分枝数和比根长与根系平均直径呈显著负相关关系.(4)对根系9个生长指标提取主成分后聚类为4个类群,D2与D4处理各划分一类;U2与U4处理划分一类,其余三个处理划分一类.综上所述,凋落物浅层覆盖(D2处理)适宜格氏栲根系生长;凋落物上层(U2和U4处理)种子萌生根根系受凋落物阻隔作用阻止其与土壤接触,而一旦根系与土壤接触,生长速度加快;土壤表层(CK处理)受地表光照及水分条件限制及凋落物深层覆盖(D6和D8处理)的幼苗受深层凋落物产生的机械阻碍力影响,通过调整对根干物质质量的投入和根系形态可塑性来适应种子散布.因此,在幼苗根系快速生长阶段,通过人为干扰方式,适当调节森林凋落物厚度,以促进格氏栲幼苗在林内更新.
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    【要点】：研究探讨了种子散布位置对格氏栲幼苗根系生长形态及特征的影响，发现凋落物浅层覆盖更有利于幼苗根系发展。
    

    【方法】：通过模拟不同种子散布位置，设置凋落物上层、土壤表层和凋落物下层三种处理，对比分析了幼苗根系的多个生长指标。
    

    【实验】：实验使用格氏栲种子，设置了U2、U4、CK、D2、D4、D6和D8七种处理，对幼苗根系的生长指标进行了测量和分析，结果表明D2处理下的幼苗根系表现最优。