【摘要】 本文研究了不同作物对磷素的反应及其根系形态特征、生理特征等对磷素吸收的影响,结果表明:（1）不同作物对磷的敏感程度不一样,其强弱顺序为:油菜、麻菜>小麦、苕子>黑麦草;（2）作物缺磷时,根部转移到地上部磷的比例较正常作物为低;（3）作物苗期缺磷时对根重的影响不大,而主要是通过减小根的半径以增加单位根重的比表面积,增加有机酸的分泌量等来提高其对磷的吸收;（4）根的动力学参数I_max、K_m、C_min及a值可较好地描述植株的吸磷特性。更多还原

【Abstract】 The charactcristies of root morphology and physiology in rclation to P uptake by various crops were investigated. The results were summarized as follows: （1）The sensitivity of the crops tested to P uptake was listed below: common rape, fodder rape>wheat, veteh>ryegrass. （2）The amounts of P transporting to the above-ground organs from the roots was reduced in P deficient plants. （3）In conditions of P deficiency, crops can absorpt more amounts of P through increasing the surface arca per gram of roots and fncreasing the amounts of scercting organic acids. （4）The paramcters such as I_max, C_min, K_m and α, valuc can be adcquately used to deseribe P uptake pattern by different crops.更多还原