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干旱区绿洲核桃-冬小麦间作系统核桃吸收根空间分布

, PP. 757-762

Keywords: 核桃(Juglans,regia,L.),冬小麦,间作,根长密度,空间分布,绿洲,阿克苏,新疆

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Abstract:

塔里木盆地人均耕地占有量小,在绿洲灌溉条件下核桃的大面积栽植多采用与农作物间作的模式。采用田间分层挖掘法和图像扫描分析法,对塔里木盆地绿洲灌溉条件下核桃-冬小麦间作系统中核桃吸收根(直径≤1mm)的空间分布进行研究。结果表明在垂直方向上,核桃吸收根集中分布在10~80cm土层,约占采样吸收根总根长密度的65.9%,根长密度随土层深度的变化呈指数函数分布;在水平方向上,核桃吸收根根长密度随着与树干距离的增加呈明显的降低趋势,距离两侧核桃树干0~175cm,核桃吸收根长密度占采样吸收根总根长密度的65.3%,间作巷道中央吸收根根长密度最低。在绿洲灌溉条件下,核桃-冬小麦间作系统中核桃吸收根水平和垂直分布决定了进入盛果期后,距离树干175cm以内的10~60cm土层是核桃与冬小麦的主要水肥竞争区域。

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