The total root length and weight of the poplar,willow,elm and locust are:49.29,29.45,25.42 and 68.08 km/plant,and 7.45,7.54,10.05 and 13.37kg/plant respectively.

• 欧美杨、旱柳、白榆和刺槐的根系总长度和总重量分别为每株49.；24、29