干旱区滴灌核桃树根系空间分布特性研究

为了研究核桃树根系空间分布特性，本文使用分层分段挖掘法对干旱区滴灌方式下核桃树根系总根长、根重、有效吸收根根长的空间分布规律进行了研究。研究表明：核桃树根系总根长水平方向主要分布在0～120cm处，占其总分布的90．84％；垂直方向主要分布在0～90cm处，占其总分布的78．75％。根重水平方向主要分布在0～30cm处，占其总分布的52．49％；垂直方向主要分布在15～75em处，占其总分布的61．12％。有效吸水根根长在水平距离60cm和垂直深度60cm处为分布密集区。在距离树干水平距离60cm和垂直深度60cm附近的根区，应作为核桃树水肥管理的重点区域。

Study on characteristic of root distribution of walnut tree under condition of drip irrigation in arid area

In order to study the spatial distribution feature of walnut tree root, this article used the layered sublevel mining method to study the total root length walnut tree, root weight, effective absorption root and the rule of spatial distribution under the mode of drip irrigation in arid areas. The research has shown that trees roots at horizontal direction are mainly distributed in 0 -120 cm, accounted for 90.84% of the total distribution; Vertical direction are mainly distributed in 0 -90 cm, accounted for 78.75% of the total distribution. Root weight at horizontal direction are mainly distributed in 0 to 30 em, accounted for 52.49% of the total distribution; tree roots at vertical direction are mainly distributed in 15 -75 cm, accounted for 61.12% of the total distribution. Effective root length of suction is the distribution areas of concentration of 60 cm at horizontal direction and 60 em at vertical direction . The root zone at 60 cm horizontal distance and vertical depth of 60 cm from trunk should be taken as the key area of water and fertilizer management of walnut tree.