小麦幼苗吸收H_2PO_4~-动态的室内试验与数学模拟

 在不同磷营养液培养的基础上,对耗竭48 h后的CA9325和晋麦2号(JM2)小麦幼苗吸收H2PO4-动态过程进行了室内试验及数学模拟。结果表明,缺磷时,2个品种小麦的根冠比高于供磷植株;CA9325的生物量和含磷量均高于JM2。吸收H2PO4-的动力学参数表明,缺磷的CA9325根系对H2PO4-的亲合力大,最大吸收速率也高。与缺磷小麦相比,供磷后2品种小麦植株的生物量和含磷量均显著提高,根冠比均显著降低,但各供磷水平间差异不明显。在生物试验的基础上,对小麦根系吸收H2PO4-动态的结果进行了数学模拟,表

Study on the Kinetics and Mathematics Simulation of H2PO4- Uptake in Two Wheat Seedlings

Kinetics and mathematics simulation of H2PO4- uptake were studied with two varieties of wheat seedlings,CA9325 and JM2, which were cultured in nutrient solution with different P levels and then depleted for 48 h before themeasurement. The results showed that in P-deficient plant, root/shoot ratio was higher than that of the P-supplied plants,biomass and P content of CA9325 were higher than those of JM2. Under P-deficient condition, CA9325 had higher affinityto P and greater P uptake rate than JM2. Compared with the P-deficient plants, P-supplied plants had higher biomasses andP contents, lower root/shoot ratio, but there were no remarkable differences between the two varieties. Based on thebiological experiment, the process of H2PO4- uptake was simulated using the transfer function model. It showed that thesimulated data were good in agreement with the measured data, and suggested that the model could be used for modelingH2PO4-uptake by roots of wheat seedlings.