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采用田间分层挖掘法和图像扫描分析法,研究了干旱区绿洲灌溉条件下不同树龄轮台白杏根系的空间分布特征.结果表明:轮台白杏的根系主要由细根(d≤1mm)构成,中粗根(12mm)所占比例较小,树龄5a、10a和15a轮台白杏细根长度分别占根系总长度的90.9%、88.4%和79.9%.随树龄延长,根长密度增加,不同径级根长密度均为15a>10 a>5a.在垂直方向上,轮台白杏的根长密度呈现出先增加后减小的分布趋势,且各土层根系干质量密度差异显著,树龄5a、10a和15a轮台白杏根系干质量密度分布较集中的区域分别为距离树干200cm以内的30～80cm、30～100cm和30～100cm深度土层.轮台白杏根系的水平分布特征为距离树干越远根系干质量密度越小,且距树干不同距离处的差异显著.从减小相邻树行间树体根系的交错重叠和降低水肥竞争的角度考虑,在干旱区绿洲灌溉条件下,轮台白杏的栽植行距应≥6m.
The spatial distribution characteristics of root system of white apricot in different ages were studied by the method of field stratified mining and image scanning analysis.The results showed that the root system of the apricot was mainly composed of fine root (d≤1mm) (1 2mm) accounted for 90.9% and 88.4% of the total root length respectively at the age of 5a, 10a and 15a, And 79.9%, respectively.With the increase of tree age, the root length density increased, and the root length density of different diameter classes was 15a> 10 a> 5a. In the vertical direction, the root length density of Lintongbai apricot increased first and then decreased , And there was significant difference in root dry mass density among the different soil layers. The areas with the highest dry mass density distribution at the root age of 5 a, 10 a and 15 a were 30-80 cm, 30-100 cm and 30-100 cm Soil.The horizontal distribution characteristics of the root system of white almond in RCCB were that the farther the distance from tree trunks was, the smaller the root dry mass density was, and the difference from tree trunks was significant.From reducing the staggered overlapping and decreasing Water and fertilizer competition point of view, in the arid oasis irrigation conditions, the turn Taiwan Bai Xing planted Line spacing should ≥6m.