渭北旱塬小麦根系的再生能力及其意义
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Ability and Significance of Wheat Root Regeneration in Weibei Rainfed Tabl e1 and
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    摘要:

    在降水少、水土流失严重的渭北旱塬所进行的试验表明:经历冬、春干旱危害的小麦, 分布在耕层以内的密集的根都枯黄萎缩, 报表皮细胞全部破皱剥落, 完全丧失了吸收功能, 只有输导组织仍然健全。分布于土壤深层的根由于所处土层较上层湿润, 具有吸收能力, 但由于其根量比上层少得多, 加之深层土壤含养分少, 所吸收的水分和养分难以满足小麦正常生长发育的需要, 所能获得的产量很低。返青期至拔节期降水(≥20mm)后, 耕层已损害的根虽不能恢复其吸收功能, 但可通过再生机制产生新的次生根以恢复其吸收能力。此时根系具较强的补偿吸收能力, 结合春雨追施N肥, 可提高旱地小麦对水肥的利用效率。

    Abstract:

    Under very dry condition, the winter wheat roots in cultivated soil layer withered in spring, the epidermis, except the vascular tissue, damaged. This showed that the roots lost their absorbing ability.The roots in deep soil layer have the absorbing ability because the deep soil layer is damper, but the water and nutrient that absorbed by the roots in deep soil layer can not meet the need of wheat growth and development.for the roots and nutrient in deep soil layer are less than those in cultivated soil layer.So, the yield was very low.After the rainfall in the turn of green stage and jointing stage, the damaged roots can not recover, but winter wheat has the ability of producing new secondary roots to recover its absorbing ability.In this stage, the root system had strong compensation absorbing ability.Thus, it is an effective measure to raise the effects of water and fertilizer on dryland winter wheat through applying nitrogen fertilizer in spring ram.

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肖玲,赵先贵.渭北旱塬小麦根系的再生能力及其意义[J].水土保持通报,1996,(2):55-57

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  • 收稿日期:1995-04-12
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  • 在线发布日期: 2014-11-28
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