水稻叶色变化与氮素吸收的关系

【目的】明确水稻叶色变化与氮素吸收的关系。【方法】采用水培试验的方法，对水稻植株的叶色黑黄动态变化及氮素吸收速率进行研究。【结果】水稻植株在整个生育期存在着明显的叶色和氮素吸收变化。吸氮速率高峰分别出现在刚移栽后、抽穗前20 d左右和抽穗开花期，低谷分别出现在拔节前和抽穗前10 d左右。水稻氮素吸收速率与其后2周的叶色SPAD值密切相关。【结论】水稻地上部叶色的黑黄动态变化主要是由于根系吸收氮素变化引起的，这种变化主要受制于其自身内在节奏所制约的生物学节律。在氮素浓度恒定的条件下，水稻的叶色和氮素吸收速率亦受其生物学规律所制约。

Relationship Between Leaf Color and Nitrogen Uptake of Rice

Objective] In order to reveal the relations of leaf color and nitrogen uptake office. Method] The dynamic change of upper-most three leaves color and nitrogen uptake rate of rice was studied in solution experiments. Result] There were significant changes of leaves colors and nitrogen uptake during growing period. The three peaks emerged at the days after transplanting, 20 days before heading, and heading and anthesis, low vallies emerged at jointing stage and I0 days before heading. The rate of nitrogen uptake correlated closely with SPAD values of rice leaf after two weeks. Conclusion] The dynamic change of leaf color of rice is mainly caused by nitrogen uptake of root, the changes of leaf color and nitrogen uptake rate are limited by inherent rhythm of its oneself, especially with constant nitrogen concentrations of solution.