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本文分析了不同生态类型的31个小麦品种的粒重、粒数与各气候生态因子的关系,结果表明:1.千粒重与灌浆持续期、开花至成熟的日照时数、辐射量、灌浆速度、昼夜温差以及15~25℃的积温呈正相关,与开花至成熟期间>25℃的积温和拔节至开花的日平均温度呈负相关,而日平均温度又与灌浆期是显著的负相关。通过逐步回归分析得到了不同类型品种千粒重与综合气候因子的多元回归方程。2.穗粒数与四分子期至开花期的日照时数和辐射量呈正相关,而春性和半冬性品种的穗粒数与此期的日平均温度呈抛物线关系。当日均温为15~17.5℃时,春性和半冬性品种的穗粒数最多,而冬性品种的穗粒数与日均温呈直线负相关关系。
In this paper, the relationship between grain weight and grain number and climatic ecological factors of 31 wheat cultivars with different ecotypes was analyzed. The results showed that: 1. 1000-grain weight and filling duration, flowering to maturity sunshine duration, radiation, filling speed, There was a positive correlation between temperature difference between day and night and accumulated temperature from 15 ℃ to 25 ℃, negatively correlated with accumulated temperature> 25 ℃ and average daily temperature from jointing stage to flowering stage. However, daily mean temperature was significantly negatively correlated with grain filling stage. Multiple regression equations of 1000-grain weight and comprehensive climatic factors for different types of cultivars were obtained through stepwise regression analysis. There was a positive correlation between the number of grains per spike and the hours of sunshine and radiation from tetrad stage to flowering stage, while the number of grains per spike of spring and semi-winter varieties had a parabola relationship with the daily mean temperature. When the average daily temperature was 15 ~ 17.5 ℃, the number of grains per spike in spring and semi-winter varieties was the highest, while that in winter was negatively correlated with the average daily temperature.