为探究气象因子对水稻灌浆速率及千粒重的影响及影响程度,开展了一系列水稻分期播种试验,并利用主成分分析（PCA）和冗余分析（RDA）方法对气象因子进行深入分析。结果显示,光温气象因子是影响水稻灌浆速率的主要因素之一。冗余分析发现,日平均气温、日最高气温、阶段积温、阶段日照时数和日较差与灌浆速率呈正相关,与千粒重呈负相关。在这些因素中,日最高气温、日最低气温和日较差对水稻灌浆速率和千粒重的影响较为明显。研究结果为水稻关键生长季节的农业气象服务提供一定的参数资料和技术支持,以提高水稻产量和品质。

To investigate the impact and extent of meteorological factors on the grain filling rate and thousand-grain weight of rice, a series of staged rice planting experiments were conducted, principal component analysis (PCA) and redundancy analysis (RDA) were utilized to deeply analyze the meteorological factors. The results revealed that photothermal meteorological factors were the main factors affecting the grain filling rate of rice. Through redundancy analysis, it was showed that daily average temperature, daily maximum temperature, stage accumulated temperature, stage sunshine duration, and daily temperature range were positively correlated with the grain filling rate but negatively correlated with thousand-grain weight. Among these factors, daily maximum temperature, daily minimum temperature, and daily temperature range had the most significant impact on the grain filling rate and thousand-grain weight of rice. The research results provided some parameter data and technical support for agricultural meteorological services during key growing seasons of rice, in order to improve rice yield and quality.