幼龄期红枣吸收根系空间分布特征  

Spatial distribution characteristics of absorbing root system of red jujube in juvenile phase

作　　者：杨婵婵[1,2] 李宏[1] 郭光华[1] 张志刚[1] 

机构地区：[1]新疆林业科学院,乌鲁木齐830000 [2]新疆师范大学,乌鲁木齐830054

出　　处：《南方农业学报》2013年第2期270-274,共5页Journal of Southern Agriculture

基　　金：林业公益性行业科研专项项目(201004085-1)

摘　　要：【目的】研究新疆阿克苏地区幼龄期(3cm地径)红枣吸收根系空间分布特征,为干旱区高效节水灌溉提供理论依据。【方法】采用剖面挖掘和分层取样法,利用WinRHIZOPro2010a根系分析系统分析漫灌条件下有效吸收根(根径<2mm)的空间分布特征。【结果】在水平方向上,幼龄期红枣根长密度呈抛物线型分布,93.09%以上根系分布在距树干水平距离0～150cm处,分布密集区为0～50cm,最大值出现在0～25cm;在垂直方向上,幼龄期红枣根长密度呈指数型分布,94.07%以上的根系分布在土层深度0～50cm处,根系分布密集区为0～20cm,最大值出现在10～20cm。【结论】距离树干水平距离0～150cm和垂直方向0～50cm的土层是幼龄期红枣根系分布较密集的区域,也是田间水肥管理的重要区域。[Objective ]By studying spatial distribution characteristics and functions of absorbing root system of red ju- jube in juvenile phase （3 cm ground diameter） in Aksu of Xinjiang, critical parameters for the establishment of root-water- uptake model were gained to provide theoretical references for efficient water-saving irrigation in drought regions. [Method]Based on the soil profile excavation and stratified sampling methods, using WinRHIZO Pro2010a root analysis system, the spatial distribution characteristics of 3 cm diameter class jujube absorbing roots （root diameter 〈2 ram） under irrigation conditions were analyzed. [Result]In the horizontal direction, jujube root length density distribution showed a parabolic curve in 3 cm diameter class. Distribution-intensive area of 3 cm diameter class jujube roots was in 0-50 cm, and 93.09% root distribution was in 0-150 era. The peak value appeared in 0-25 cm. In the vertical direction, jujube root length density exhibited exponential distribution in 3 cm diameter class. Distribution-intensive area of 3 em diameter class jujube roots was in 0-20 cm, and 94.07% root distribution was in 0-50 cm. The maximum value occurred in 10-20 cm. [Conclusion]A depth of 0-50 cm soil and 0-150 cm away from the trunk is the the root distribution-intensive area and important area for field water and fertilizer management of 3 cm diameter class jujube.

关 键 词：红枣 吸收根 根长密度 根表面积 根系空间分布 

分 类 号：S662.9[农业科学—果树学]