摘要
在冬小麦主要生育期,测定了6个不同水分处理的光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)以及土壤含水率,分析了它们之间的相互关系,探讨了各生理指标在诊断作物水分状况的和可行性和发展潜力。结果表明:冬小麦各生理指标之间有着极显著的相关关系,蒸腾速率、光合速率和气孔导度相互之间的增大或减小是同步的,它们之间有着密切的线性关系,气孔导度直接影响蒸腾速率和光合速率,三者之间呈极显著正相关;土壤水分与蒸腾速率、光合速率、气孔导度呈显著或极显著正相关,当土壤含水量保持在田持的60%左右的时候,Pn/Tr最大,光合利用效率最高。
In the growth stage of winter wheat, photosynthetic rate, transpiration rate , stomata conductance and volumetric soil water content are measured for six different water treatments, and relationship among them and volumetric soil water content are analyzed. The results indicate that Tr, Pn and Gs lead increase or decrease synchronously. Analyses indicate a close linear correlation between them. Gs directly influences Tr and Pn and they have shown remarkable positive correlations. Furthermore, soil moisture indexes have extremely remarkably positive correlations with them. The ratio between Pn and Tr is equal to the leaf water use efficiency. The relationship between Pn/Tr and the soil moisture content were quadratic parabola. When the soil moisture content of winter wheat maintains at 60% of field moisture capacity, the photosynthesis use efficiency reaches the highest.
出处
《中国农村水利水电》
北大核心
2009年第5期49-52,共4页
China Rural Water and Hydropower
基金
国家自然科学基金项目(50479043)
水利部科技创新项目(SCX2003-14)
关键词
光合速率
气孔导度
蒸腾速率
土壤水分
photosynthetic rate
transpiration rate
stomata conductance
soil water content
