娄底市农业气候资源与油菜产量的特征研究

利用娄底市常规气象观测资料和娄底市油菜产量统计资料,对1981～2010年娄底市油菜不同生育期的气温、降水量和日照时数进行主分量分析定义出气候综合指标,再通过Morlet小波变换对气候综合指标和油菜产量进行多时间尺度特征分析。结果表明:娄底市油菜不同生育期气候综合指标均由前两个主分量贡献产生,并存在明显的多时间尺度特征;娄底市油菜全生育期气候综合指标和油菜产量各自所反映的多时间尺度特征具有相似性。

Characteristics of Agricultural Climate Resources and Yields of Rape in Loudi City

Using the routine meteorological data and the statistical data of yield of rape in Loudi City from 1981 to 2010,climate composite index was defined by principal component analysis of temperature,precipitation and sunshine hours in different growth stages of rape,and then multiple time scale characteristics of climate composite index and yields of rape were analyzed by using Morlet wavelet transformation.The results showed that climate composite index in different growth stages of rape in Loudi city were all produced by the contribution of the first two principal components,and there was obvious characteristics of multiple time scale;the multiple time scale characteristics reflected respectively by climate composite index and yields of rape in the whole growth stages in Loudi city had the comparability.