Abstract: 【Objective】 To comprehensively and accurately understand the spatial distribution of walnut tree roots in different planting years in southern Xinjiang, and scientifically carry out fertilization management. 【Methods】 The walnut trees with different planting years in Wensu County of Aksu Prefecture in southern Xinjiang were taken as research objects. The spatial variation of walnut roots in 5, 10, 15 and 20 years was investigated. 【Results】 The results showed that the dry weight density of roots increased with the increase of walnut age, and the horizontal and vertical depths increased. The total dry mass of roots also increased. The root system of 5-year-old walnut trees mainly concentrated 0-100 cm in the direction of trees II and III, and the depth was 0-40 cm; 10-year-old tree was 50~150 cm in the direction of I and III from the tree level, and the depth was 0-40 cm. At 80-100 cm; 15-year-tree was 150-250 cm in the direction of tree I and III, and the depth was 20~80 cm; 20-year-old tree was 0~150 cm in the direction of tree II and III, and the depth was 0-80 cm. 【Conclusion】 With the increase of years, the roots of walnuts continue to extend horizontally and vertically, and the parts of fertilization should be widened and deepened with the distribution of roots.

Key words: walnut; root system; spatial characteristics; planting years

摘要： 【目的】研究南疆不同种植年限核桃树根系空间分布变化规律,为科学施肥管理提供参考。【方法】以南疆阿克苏地区温宿县不同种植年限的核桃树为研究对象,调查分析种植5、10、15、20年核桃树根系空间变化。【结果】根系干质量密度随着核桃树龄的增加而水平方向及垂直深度呈现递增的趋势,根系干质量总数也随之增加。5年生核桃树根系主要集中在距树水平Ⅱ、Ⅲ方向上0~100 cm,深度为0~40 cm处; 10年为距树水平Ⅰ、Ⅲ方向上50~150 cm,深度为0~40 cm和80~100 cm处;15年为距树水平Ⅰ、Ⅲ方向上150~250 cm,深度为20~80 cm处;20年为距树水平Ⅱ、Ⅲ方向上0~150 cm,深度为0~80 cm处。【结论】随着年份的增加,核桃根系不断向水平及垂直方向延伸,对于施肥部位也要随根系的分布而加宽加深。

关键词: 核桃, 根系, 空间特征, 种植年限