摘要
研究了不同氮肥浓度和形态下,超级稻品种沈农265齐穗期剑叶光合速率(Pn)日变化及其与影响因子的相互关系,探讨了各因子对超级稻剑叶净光合速率的影响。结果表明,不同氮肥条件下Pn在9∶00～13∶00时段无显著差异,早、晚差异显著;硫酸铵-硝酸钠混施处理,Pn呈单峰曲线,其他处理下Pn都出现了光合"午休"现象;随着施氮量的增加,净光合速率日变化整体呈现上升趋势。相关及回归分析表明,不同时段、不同氮肥处理,超级稻品种沈农265齐穗期剑叶净光合速率与各影响因子的相关性质和相关程度不同;气孔因素是影响净光合速率日变化的主要限制因子。
Relationship between diurnal changes of net photosynthetic rate and affecting factors in flag leaves of rice under different nitrogen form and concentration conditions was studied at the full heading stage of super rice Shennong 265. Net photosynthetic rate showed no significant differences between 9：00-13：00 under differeut nitrogen treatments, whereas there were significant differences between 6：00-9：00 and between 14：00-18：00. The net photosynthetic rate showed a single peak curve in a day under ammonium sulfate-sodium nitrate mixed fertilizer treatments,but the midday depression of net photosynthetic rate appeared under other nitrogen fertilizer treatments. Diurnal changes of net photosynthetic rate increased signifcantly under high nitrogen tertilizer conditions. There were some differences in correlation character or correlation degree between net photosynthetic rate and all affecting factors under different nitrogen treatments. Stomatal factors served as determinants for diurnal changes of net photosynthetic rate.
出处
《湖北农业科学》
北大核心
2009年第6期1304-1308,共5页
Hubei Agricultural Sciences
基金
国家科技支撑计划项目(2006BAD01A01-6-6)
关键词
水稻
氮素
净光合速率
日变化
相关分析
rice
nitrogen
net photosynthetic rate
diurnal changes
correlation analysis
