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采用砂培培养方法研究了缺磷胁迫对大豆根系形态和氮磷吸收积累的影响,结果表明:缺磷胁迫促进了大豆根系的生长,根长、根表面积、根体积等均比正常供磷条件下增加,从而增大了大豆根系对磷的吸收利用。大豆植株体内总氮含量随着营养液中磷水平的增加而增加,缺磷抑制了大豆对氮磷的吸收利用,不同器官中的氮磷含量,籽粒中最高,根瘤中的氮含量显著高于地上部和根,表明根瘤是氮素贮存的一个主要场所;不同磷处理间,无磷与高磷以及低磷与高磷处理间均达到了5%的显著差异。缺磷胁迫增加了大豆的磷素吸收效率,而降低了大豆的磷素利用效率,这是大豆对缺磷胁迫的一种适应机制。
The effects of phosphorus deficiency stress on root morphology and nitrogen and phosphorus absorption and accumulation of soybean were studied by using sand culture method. The results showed that the phosphorus deficiency promoted the growth of soybean roots. The root length, root surface area and root volume were all higher than those of normal phosphorus supply Under the increase, thereby increasing the soybean root phosphorus absorption and utilization. Total nitrogen content in soybean plants increased with the increase of phosphorus in nutrient solution, and phosphorus deficiency inhibited the uptake and utilization of nitrogen and phosphorus in soybean. Nitrogen and phosphorus content in different organs, the highest in grain and nitrogen content in nodules were significantly higher than The shoots and roots indicated that nodules were a major site for nitrogen storage. Significant differences of 5% were found between different treatments of phosphorus, non-phosphorus and high phosphorus, and between low-phosphorus and high-phosphorus treatments. Phosphorus deficiency increased the phosphorus uptake efficiency of soybean and decreased the phosphorus use efficiency of soybean, which is an adaptive mechanism of soybean to phosphorus deficiency stress.