砂壤土绿岭核桃根系空间分布规律研究

Research on the Spatial Distribution of Lüling Walnut Root System in Sandy Loam

对核桃根系水平和垂直分布规律进行调查研究,明确根系集中分布区。以有灌溉条件的6年生砂壤土绿岭核桃为对象,采用分层挖掘法对其根系充分挖掘,并进行烘干和称重,计算根质量密度。总根质量密度与距树体距离(D)、土层深度(Z)的关系符合方程RD W=1060.091528+1380.9051190 Z-549.8565238 D-2418.2142857 Z 2+44.95021645 D 2+281.73666667 Z×D(r=0.7249,P<0.01);距离树干0.5~2.5 m、距地表40~60 cm深的区域是核桃根系分布密集区,担负养分和水分吸收功能的细根密集分布区同总体根系分布情况大致相同。

To determine the concentrated distribution area of walnut root system through the investigation of horizontal and vertical distribution of walnut root system.The experiment was conducted with 6-year-old Lüling walnut planted in sandy loam with irrigation condition.Root was excavated in layers,dried and weighed.Data were used to calculate root weight density.The relationship among total root weight density,the distance from trunk and soil depth was in accordance with the equation RD W=1060.091528+1380.9051190 Z-549.8565238 D-2418.2142857 Z 2+44.95021645 D 2+281.73666667 Z×D(r=0.7249,P<0.01).The area 0.5-2.5 m away from the trunk and 40-60 cm deep from soil surface was the concentrated distribution area of walnut root system.The dense distribution area of fine roots bearing the function of nutrient and water absorption was roughly the same as that of the whole root system.