陇东玉米拔节至抽雄期降水与产量及生物量的相关性分析

利用陇东黄土高原旱作玉米拔节至抽雄期降水量与产量及生物量资料,分析降水量与产量及生物量的相关性.结果表明:拔节至抽雄期降水量与产量相关系数达0.8304,通过0.001信度检验,达到极显著相关水平;对产量构成因素的影响,主要对果穗长、百粒重和果穗粗影响明显;对抽雄至成熟期鲜重和干物质重的影响基本为正效应,但相关性不显著,对穗的影响具有逐步增强趋势.降水量年型与产量年型完全对应年占总年份的50%,完全对应年和基本对应年占总年份的75%.降水最少的年份为1997年,为19.1 mm,玉米产量为137.2 kg/667m2,最多年份为2005年,为185.3 mm,玉米产量为662.1 kg/667m2,并建立了利用降水预报产量的模型.

The correlation of precipitation during jointing to heading with output and biological yield in East of Gansu Province

Based on the data of the precipitation during jointing to heading and the output and biologica yield of maize on Loess Plateau in East of Gansu, the correlations of precipitation with output and biological yiele were analyzed. The results showed that the correlation coefficient between the precipitation during jointing to heading and the output reached 0. 8304, with 0. 001 confidence degree reached very significant level. It affectec the output components, mainly the spike length, the weight of 100-grais and the spike thick. The correlation o the precipitation with the fresh matter weight and dry matter weight during jointing to maturity is positive, but is not significant, and its effect on spike increased. The complete agreement of rainfall year type with output year type accounted for 50 %. The complete and main agreement accounted for 75 %. The year of least rainfall is 1997, the rainfall is 19.1 mm, and the maize output is 137.2 kg/667m^2. The year of most rainfall is 2005, the rainfall is 185.3 ram, and the maize output is 662.1 kg/667m^2. The output model forecasted using precipitation was set up.