【摘要】 运用土培、石英砂培、有机酸释钾实验及矿物X衍射分析研究了不同基因型籽粒苋(Amaranthusspp.)对土壤矿物钾的吸收利用及其机制。结果表明,籽粒苋能有效地利用土壤和云母(黑云母和金云母)中的钾;籽粒苋品种R104、CX4对钾的吸收量高于一般型品种(CX77);籽粒苋根系能引起云母矿物向蛭石转化;籽粒苋根系分泌物中的草酸比一般有机酸具有更高的释放矿物中钾素的能力。更多还原

【Abstract】 Potassium uptake and its mechanism from soil and minerals by various genotypes of grain amaranth (Amaranthus spp.) were studied by soil pot experiment, quartz cultivation experiment and batch mica-K release experiments by organic acids as well as mineral X-ray diffraction analysis. The results showed that grain amaranth could efficiently take up K from both soil and micas (biotite and phlogopite). Genotypes of R104 and CX-4 took up more K than CX-77. Roots of grain amaranth stimulated transformation of mica to vermiculite. The oxalic acid from the root exudates of grain amaranth was able to release greater K from K-bearing minerals than other common organic acids.更多还原