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。
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.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
1991年第4期65-70,共6页
Journal of Nanjing Agricultural University
关键词
磷
吸收
作物
根系
生理特性
phosphorus
uptake pattern
crops
root
morphology
physiology characteristies
