Abstract:

In order to research the influence of the change of sunshine duration in Chaozhou City on the crop growth, crop quality and crop yield of the region, based on the Chaozhou meteorological data, including sunshine hours and total cloud amount, low-level cloud amount, vapor pressure and relative humidity of meteorological stations from 1960-2011, the characteristics of sunshine hours change in Chaozhou had been studied with the methods of percentage of sunshine hours anomalies, moving t test, and wavelet analysis. The result indicated that, in terms of Chaozhou, the sunshine hours of 1990s, the earlier of this century and 1960s was the most of the sunshine hours from 1960 to 2011, 1980s was the least. The greatest amplitude season was autumn, the least was summer. Mutation test showed that the age 1990s sunshine hours increased rapidly, mutations occurred in 1994, the sunshine hours the earlier of this century reduced rapidly, mutations occurred in 2004. According to the periods of annual and seasonal sunshine hours change, it would be mainly in the more period for the more significant time scale.