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[目的]研究不同灌水量对水稻叶片生理及水分利用率的影响。[方法]在南京信息工程大学农业气象试验站进行了3个不同处理的灌溉试验。[结果]淹灌处理下的水稻叶温比湿润灌溉低0.4~0.7℃;当光合有效辐射强度的范围在800~1 800μmol/(m~2·s)时,淹灌处理下的水稻叶片平均气孔导度比湿润灌溉大0.123~0.183 mol H_2O/(m~2·s),叶片水分利用率高0.24 g/kg;每天10:00之后淹灌的水分利用率始终高于湿润灌溉处理;与湿润灌溉处理相比,淹灌处理的水稻不仅叶片水分利用率较高,而且最终产量也有比较明显的提升,其水稻增产量达5.89%~13.97%。[结论]该研究为田间管理提供了实际参考依据。
[Objective] The research aimed to study the effects of different irrigation amount on the physiological and water use efficiency of rice leaves. [Method] Three different treatments of irrigation experiments were carried out at the Agricultural Meteorological Experiment Station of Nanjing University of Information Science and Technology. [Result] The leaf temperature under flooded irrigation was 0.4 ~ 0.7 ℃ lower than that under wetting irrigation. When the photosynthetically available radiation intensity ranged from 800 to 1800μmol / (m ~ 2 · s), the average leaf temperature under flooded irrigation The stomatal conductance was 0.123 ~ 0.183 mol H_2O / (m ~ 2 · s) higher than that of wetting irrigation, and the water use efficiency of leaves was 0.24 g / kg. The water use efficiency of flooding irrigation was always higher than that of wetting irrigation after 10:00; Compared with the wetting irrigation, the paddy rice under flooded irrigation not only had higher water use efficiency, but also significantly increased the final yield. The rice yield increased from 5.89% to 13.97%. [Conclusion] This study provided the practical reference for field management.