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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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根修剪对冬小麦根系效率、水分利用及产量的影响
DOI: 10.3724/SP.J.1145.2009.00606, PP. 606-609
Keywords: 冬小麦,根修剪,根系效率,水分利用效率,产量,干旱胁迫
Abstract:
通过盆栽试验研究了根修剪对冬小麦根系效率、水分利用及产量形成的影响.结果表明，在不同水分条件下，根修剪均减少了小麦的根量及根呼吸速率，但对根冠比没有显著影响.在湿润和中度干旱条件下，根修剪提高了小麦花期的光合速率和根系效率；在严重干旱胁迫条件下，根修剪小麦的光合速率显著下降，但根系效率与对照相比没有显著差异.在湿润条件下，小剪根处理对籽粒产量并没有显著的影响，而大剪根处理小麦的籽粒产量显著下降；在中度干旱胁迫条件下，小剪根处理小麦的产量（25.18gpot-1）显著高于对照（22.31gpot-1），但大剪根处理小麦的产量（18.34gpot-1）显著下降；在严重干旱条件下，两个剪根处理小麦的产量均显著下降.在湿润和中度干旱胁迫条件下，小剪根处理籽粒产量水平的水分利用效率（分别为1.57gkg-1和1.85gkg-1）显著大于相应的对照处理（分别为1.46gkg-1和1.55gkg-1），但大剪根处理水分利用效率和对照相比没有显著差异；在严重干旱条件下，各剪根处理的水分利用效率和对照相比没有显著差异.可见，在湿润和中度干旱条件下进行的适当根修剪根对作物生产是有利的.图1表3参15
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