| The method of 3-dimensional coordinate excavation of total root system is explored to probe into the root systems of Ostryopsis davidiana,Rosa xanthina and Spiraea trilobata in the Loess Plateau of western Shanxi.The result shows that these three species of shrubbery have a wide horizontal range and a narrow vertical range of root system.The roots of Ostryopsis davidiana are mainly concentrated in 0～60 cm soil profile and those of Rosa xanthina are in 0～40 cm.In the aspect of root architecture characteristics,the roots of Ostryopsis davidiana and Rosa xanthina are mainly lateral and diagonal ones and there are very few taproots.Spiraea trilobata of 7 years old has a complex root system and has a lot of second and third branch roots and shows a strong adaptability. |