平地与边坡条件下野生胡枝子根构型特征研究
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摘要
以鹫峰林场自然生长两年的野生胡枝子(Lespedeza bicolor)为研究对象,采用全根原位挖掘法和根系分析系统Win-RHIZO相结合的方法,研究自然条件下平地与不同坡度(24°、35°、45°)边坡4种立地条件下胡枝子的根系差异性特征,旨在揭示植物在异质环境中根系变化及其相应适应性策略。结果表明,1) 4种立地条件下胡枝子根系分布范围和不同方向基根数量分布差异显著(P <0.05),平地条件下根系趋于表层化,边坡胡枝子根系垂直拓展能力增强;2)相对于地上生物量,边坡环境对根系生物量和根冠比影响更显著,其中35°坡面根系生物量最高;3)随着坡度的增加,胡枝子根深宽比与根冠比呈逐渐增大的趋势;4)不同立地条件对胡枝子的根构型特征均有一定影响。4种立地条件下植物根长、根系分形维数和根丰度变化一致,即35°>平地> 45°> 24°;根体积和根表面积的大小有相同的变化趋势,即35°> 45°>平地> 24°。其中35°边坡条件下胡枝子根长、根表面积、根体积、分形维数、根丰度均最高,根系较发达。综上,不同立地条件在不同程度上影响着根系的形态建成,使植物形成了独特的根系适应性策略,表现出植物根系对异质环境的可塑性。
Our objective was to study the root differences of Lespedeza bicolor under natural conditions in flatland and sloped sites, and to reveal the root changes and adaptive strategies of plants growing in different sites. The root distribution and fractal characteristics of two years old L. bicolor growing in flatland and sloped conditions(24°, 35°, 45°) in Jiufeng Forest Farm were compared by excavating whole root systems and using a Win-RHIZO root analysis system. 1) There were significant differences in the root distribution range and number of base roots growing in different directions between the four sites(P < 0.05). Root systems tended to occur in the surface layer in flatland sites, while vertical expansion of L. bicolor root systems tended to be enhanced in sloped sites. 2) Sloped sites had more significant effects on root biomass and rootshoot ratio than flatlands, and root biomass was the highest in 35° sloped sites. 3) The root depth-width ratio and root-shoot ratio of L. bicolor tended to increase with increasing slope. 4) Different site conditions had certain effects on the root architecture of L. bicolor. The changes in root length, root fractal dimension, and root abundance were consistent between the four site conditions, which showed as 35° > flatland > 45° > 24°. Root volume and root surface area differed between the sites(35° > 45° > flatland > 24°). The root length, root surface area, root volume, fractal dimension, and root abundance of L.bicolor were the highest in the 35° sloped sites and the root systems were more developed. The results show that different site conditions affect root morphogenesis in varying degrees, and plants form unique root adaptation strategies, which shows the plasticity of plant roots to adapt to heterogeneous environments.
Our objective was to study the root differences of Lespedeza bicolor under natural conditions in flatland and sloped sites, and to reveal the root changes and adaptive strategies of plants growing in different sites. The root distribution and fractal characteristics of two years old L. bicolor growing in flatland and sloped conditions(24°, 35°, 45°) in Jiufeng Forest Farm were compared by excavating whole root systems and using a Win-RHIZO root analysis system. 1) There were significant differences in the root distribution range and number of base roots growing in different directions between the four sites(P < 0.05). Root systems tended to occur in the surface layer in flatland sites, while vertical expansion of L. bicolor root systems tended to be enhanced in sloped sites. 2) Sloped sites had more significant effects on root biomass and rootshoot ratio than flatlands, and root biomass was the highest in 35° sloped sites. 3) The root depth-width ratio and root-shoot ratio of L. bicolor tended to increase with increasing slope. 4) Different site conditions had certain effects on the root architecture of L. bicolor. The changes in root length, root fractal dimension, and root abundance were consistent between the four site conditions, which showed as 35° > flatland > 45° > 24°. Root volume and root surface area differed between the sites(35° > 45° > flatland > 24°). The root length, root surface area, root volume, fractal dimension, and root abundance of L.bicolor were the highest in the 35° sloped sites and the root systems were more developed. The results show that different site conditions affect root morphogenesis in varying degrees, and plants form unique root adaptation strategies, which shows the plasticity of plant roots to adapt to heterogeneous environments.
引文
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