PAN Lu,TANG Lixia,ZHANG Qiaoyan,et al.Distribution Characteristics of Two Shrubs Roots in Heterogeneous Growth Space[J].Research of Soil and Water Conservation,2022,29(02):330-336+344.
两种灌木根系对异质生长空间的适应分布特征
- Title:
- Distribution Characteristics of Two Shrubs Roots in Heterogeneous Growth Space
- 文章编号:
- 1005-3409(2022)02-0330-07
- 分类号:
- Q945; S718.51+9
- 文献标志码:
- A
- 摘要:
- 为探究灌木根系对异质空间的适应策略,以紫穗槐和胡枝子两种灌木为研究对象,采用盆栽控制生长空间的研究方法,以放置不同形状的木板在盆内模拟不同喀斯特异质空间条件(孔隙型、圆形裂缝型、条形裂缝型和孔隙+岩石阻挡型),研究了异质空间条件下两种灌木根系分布特征。结果表明:(1)异质空间条件下紫穗槐和胡枝子根系各项指标均高于均质空间,异质空间条件对根系生长有促进作用。不同植物受异质空间的影响程度不同,胡枝子在异质空间下的根系生物量显著高于均质空间。不同异质空间对根系生长的影响不同,紫穗槐和胡枝子根系均在孔隙型和圆形裂缝型两种空间条件下最为发达。(2)紫穗槐和胡枝子根生物量分布特征受异质空间影响。在异质空间下两种树种根生物量的垂直分布均集中分布在土层深度5—10 cm和15—20 cm范围内,水平分布均集中分布在距植株中心0—3 cm内。紫穗槐根系生物量的水平分布受异质空间具体形状影响较大,孔隙型空间和圆形裂缝型空间对其水平分布影响较为显著。(3)两种灌木对异质空间的适应策略不同,紫穗槐根系对异质空间的适应策略为寻找更多空间,而胡枝子根系对异质空间的适应策略为占据有限空间。综上,紫穗槐和胡枝子根系生长受空间影响,两种灌木根系对生长空间适应策略不同。
- Abstract:
- In order to explore the adaptation strategy of Amorpha fruticosa and Lespedeza bicolor roots in heterogeneous spaces, potted plant experiments were employed in this study. Different karst heterogeneous space conditions were simulated by placing different shapes of wooden boards in plant pot. The simulated spatial types include pore type, circular fracture type, strip fracture type and pore+rock barrier type. The root distribution characteristics of Amorpha fruticosa and Lespedeza bicolor under these spatial conditions were studied. The results show that:(1)all root indexes of Amorpha fruticosa and Lespedeza bicolor in heterogeneous spaces are higher than those in homogeneous spaces, which indicates that heterogeneous space can promote root growth; the root biomass of Lespedeza bicolor in heterogeneous space is significantly higher than that in homogeneous space, and the roots of Amorpha fruticosa and Lespedeza bicolor are most developed in pore type and circular crack type conditions;(2)the distribution characteristics of root biomass of Amorpha fruticosa and Lespedeza bicolor are affected by heterogeneous space; under heterogeneous situation, the root biomass of the two shrubs mainly concentrates in the 5—10 cm and 15—20 cm soils vertically, and within 3 cm around the plant stem horizontally; heterogeneous spatial shape has great influence on the horizontal distribution of root biomass of Amorpha fruticosa, especially in pore type and circular crack type;(3)the adaptation strategies of two shrubs in heterogeneous space are different; the adaptation strategy of Amorpha fruticosa roots in heterogeneous space is to find more space, while the adaptation strategy of Lespedeza bicolor roots in heterogeneous space is to occupy limited space. The growth of the root systems of Amorpha fruticosa and Lespedeza bicolor are affected by space, and the root systems of the two shrubs have different adaptation strategies in the growth space.
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备注/Memo
收稿日期:2021-03-06 修回日期:2021-04-07
资助项目:国家自然科学基金“喀斯特地区护坡灌木根系构型的固土变形机制研究”(31960332)
第一作者:潘露(1996—),女,贵州大方人,硕士研究生,研究方向为根系形态及其力学。E-mail:1102324199@qq.com
通信作者:唐丽霞(1976—),女,内蒙古呼伦贝尔人,博士,副教授,主要从事根系护坡研究。E-mail:248206125@qq.com