单季稻叶面积指数变化特征及其与气象条件的关系

为开展单季稻产量预报提供理论参考，提高气象为粮食生产服务的能力，利用浙江省湖州市的田间试验结果和气象观测资料，通过对比分析和回归分析等方法，研究了单季晚粳稻‘丙9904’叶面积指数(LAI)的变化特征及其与气象条件的关系。结果表明：（1）结合叶面积仪观测结果，得到单季晚粳稻‘丙9904’叶面积长宽校正法的校正系数为0.70，比《农业气象观测规范》给定的校正系数小0.13；（2）LAI变化特征符合水稻生长发育进程，即孕穗前呈现“S”型曲线增长，随后逐步下降；（3）温高光足有利于LAI快速变化，光照不足会导致LAI变化缓慢；（4）大暴雨导致LAI增长缓慢，连阴雨造成LAI变化缓慢，连晴天气致使LAI快速变化。

LAI of Single Cropping Rice: The Variation Characteristics and Its Relationship with Meteorological Condition

To provide a theoretical reference for the development of yield prediction of single cropping rice and improve the ability of meteorological services for grain production, based on the data of field experiment and meteorological observation data in Huzhou of Zhejiang, the authors analyzed the characteristics of LAI for single cropping late Japonica Rice (type c-9904) and its relationship with meteorological conditions, by comparative analysis and regression analysis method. The results showed that: (1) Combined with the observation data of leaf area meter，the correction coefficient for measuring leaf area by length width method was 0.70, which was 0.13 smaller than that in “agricultural meteorological observation standard”; (2) The change characteristics of LAI was in line with the process of rice growth, before booting, LAI increased with “S” curve tendency, and then, it decreased gradually; (3) The condition of high temperature and sufficient sunlight was propitious to the rapid growth of LAI, while the shortage of sunlight would slow down its growth; (4) Heavy rains led LAI to increase slowly, rainy days would led LAI to change slowly, however, sunny days would contribute to its rapid growth.