不同时期高温胁迫对江苏省水稻生育期和产量的影响

Impact of High Temperature Stress on Growing Stage and Yield of Rice in Jiangsu Province

本研究于2014年以江苏省历史气象资料和水稻生长发育观测资料为基础,对WOFOST模型进行本地化处理后,针对水稻生长季高温发生的不同强度和持续时间,利用WOFOST模型模拟分析拔节期、孕穗期、抽穗扬花期和灌浆乳熟期分别发生不同程度高温胁迫对水稻生长发育和产量的影响。模拟结果表明,过高的温度会抑制作物有机物合成,在不同强度和持续日数高温影响下,水稻减产程度依次为灌浆乳熟期最大,其次是抽穗扬花期,再次是孕穗期,拔节期最小,高温还会导致水稻生育期缩短,影响水稻干物质积累,高温发生的时段与程度不同,导致水稻减产的程度也不尽相同,并且高温强度越大持续时间越长所造成的影响越大。

Based on the historical meteorological data and production data of rice of Jiangsu,we localized WOFOST corresponding model parameters, and simulated the impact of different degrees of high temperature stress on the growth and production of rice at different development stages. The results showed that the high temperature inhibited the synthesis of organic matter. When the same intensity of high temperature stress occured, the maximum level of production reduction was at milking stage, the second was at tasseling-flowering stage, the third was at booting stage, and the minimum was at jointing stage. Besides,the high temperature stress made the rice growing period shorter, and affected the accumulation of dry matter. The higher intensity and longer continuous days the high temperature stress was, the larger the production decreased.