夹竹桃根系形态参数及其对边坡稳定的影响

Morphological Indexes of Nerium indicum Root System and Its Effects on the Stability of Slope Surface

基于野外调查和根系图像系统分析,研究根系形态对于边坡表层固土的影响。通过对夹竹桃根系的根长、根表面积、根体积、根干质量、根长密度、根系消弱系数和单位体积土中含根量7个形态学指标数据的测定和分析,结果表明:夹竹桃(Nerium indicum)属于浅根性的直根系树种,根系集中分布在0～30 cm的浅层土壤,根表面积分布特征类似于根长度的分布特征,根系细根含量丰富,根系形态学指标随土层深度加大呈现减小趋势,夹竹桃根系形态适合稳固边坡表层土体,能有效提高边坡表层抗冲刷和抗侵蚀能力。

Research was conducted to study the effects of root system on the reinforcement of slope surface soil based on the field investigation and systematical analysis of roots images. The features of Nerium indicum can be drawn by measuring and analyzing seven morphological indexes of Nerium indicum roots including root length, surface area, root volume, root dry weight, root length density, root reduced coefficient and root content in soil volume unit. N. indicum is a shallow-rooted taproot species with roots mainly distributing in the shallow soil of 0-30 cm depth. The distribution features of root surface area are similar to those of root length. N. indicum is with abundant fine root, and the morphological indexes of root system present a downtrend with the increase of the soil depth. The roots form of N. indicum is suitable for reinforcing slope surface soil and can effectively enhance the runoff and erosion-resistance of slooe surface.