地下水埋深对水稻净光合速率的影响及动态模拟研究  

Effect of Groundwater Table Control on the Net Photosynthetic Rate and its Dynamic Simulation in Paddy Field

作　　者：贾贝[1,2] 俞双恩[1,2] 叶兴成[3] 

机构地区：[1]南方地区高效灌排与农业水土环境教育部重点实验室,南京210098 [2]河海大学水利水电学院,南京210098 [3]宿迁市水务局,江苏宿迁223800

出　　处：《灌溉排水学报》2015年第4期24-27,共4页Journal of Irrigation and Drainage

基　　金：江苏省水利科技项目(2011037);江苏高校优势学科建设工程资助项目(水利工程)

摘　　要：以稻田地下水埋深作为调控指标,研究了水稻各生育期不同地下水位调控对水稻光合速率的影响。结果表明,稻田地下水埋深显著影响水稻光合速率。分蘖期、拔节—孕穗期、抽穗—开花期、乳熟期,在地下水位调控下日光合速率变化情况基本一致,但光合速率峰值在水分胁迫下较正常状态有不同程度下降,且净光合速率下降幅度随着水分胁迫程度的加剧和时间的延长而逐渐增大。轻度水分胁迫下,复水后净光合速率出现补偿效应。基于Leuning-Ball气孔导度模型的光合速率模型,净光合速率模拟值与实测值基本一致,模拟精度较高。Experiments were conducted to study the influences of groundwater table control on photosyn- thetic rate of paddy rice during various growth stages, with the groundwater table of paddy field as the control index. The results showed that the groundwater table control in paddy field had a significant effect on the net photosynthetic rate of the paddy rice. Compared to conventional treatments, the changes of the photosynthetic rate were similar under groundwater table control in tillering stage, jointing and hooting stage, sprouting and blossoming stage, milky ripe stage, but the peak of photosynthetic rate decreased dif- ferently under water stress. The net photosynthetic rates under water stress were lower than those of con- ventional treatment. As the increasing of water stress and the extension of time, the degradation of net photosynthetic rate enlarged. Compensation effect appeared after rewatering under slight water stress. The simulation data of the net photosynthetic rate, using the photosynthetic rate model based on Leuning- Ball stomatal conductance model, were almost consistent with the experimental data with high accuracy.

关 键 词：稻田地下水埋深 光合速率 模型拟合 

分 类 号：S511.22[农业科学—作物学]