用三维坐标根系全部挖掘法对 2种杨树的根系进行了研究。研究发现 ,2种杨树根系水平分布范围较大 ,垂直分布幅度较小 ,主要根系均集中在 0～ 60 cm土层中 ,基本无垂直根 ,根系以水平根和侧根为主 ,对梯田作物产量会产生较大不利影响 ;因其根系较浅的特性 ,无法利用深层土壤中的水分和养分 ,不适宜作为梯田埂坎的造林树种 ,建议采用其它深根型、耐旱的灌木树种 The root system of two poplar trees was studied by digging all the roots in three-dimensional coordinates. The results showed that the root distribution of the two poplar species ranged widely and their vertical distribution was small. The main root systems were all concentrated in 0 ~ 60 cm soil layer with almost no vertical roots. The roots were mainly horizontal and lateral roots, Yield will have a greater adverse impact; because of its shallow root canal characteristics, can not use the water and nutrients in the deep soil is not suitable as an afforestation tree species on the terrace ridge, we recommend the use of other deep-rooted, drought-tolerant shrub species