共和盆地温性草原物候期草地生产力与气候因素的灰色关联度分析

The grey correlative degree analysis on the relationship between grassland productivity and climate factors in temperate steppe of Gonghe Basin

利用灰色关联分析方法,对共和盆地温性草原草地生产力与气候因素的关联程度作相关分析,以牧草各物候期产量为对照数列,以牧草生长期月均温、月降水量及月日照时间为对比数列,经分析结果表明:牧草抽穗期产量与5月的降水量、温度和3-5月的日照时间关联度最大,而牧草籽粒成熟期产量与6-8月的温度和日照时间关联度最大。因此,在牧草早期生长阶段牧草产量取决于5月的降水量、温度和3-5月的日照时间,而在牧草成熟阶段牧草产量取决于6-8月的温度、日照时间,尤其是6-8月的温度是决定当年牧草产量高低的关键因素。

Based on the application of the gray correlative analysis, the gray correlative degree between grassland productivity and climate factors in temperate steppe of Gong-he Basin was studied, using yield at each growth stages as control series, monthly mean temperature, precipitation, sunlight time as parallel series. The results showed that the relationship between forage yield at heading stage and temperature, precipitation in May, and sunlight time in March to May was the greatest. While the greatest relationship was obtained between seed yield at maturity and temperature, sunlight time in June to August. In conclusion, the forage yield at early growth stages depended on the temperature, precipitation May and sunlight from March to May; the forage yield at maturity depended on the temperature and sunlight from June to August, especially the temperature.