关键词: 选育方法, 选育方法

Abstract: This paper analyzed the change characteristics of extreme weather and climate events, such as gale, sandstorm, heavy rain, thunderstorm and hail over Hainan area, using the data of annual occurring days of extreme weather and climate events from 5 meteorological stations in Hainan from 1961 to 2010. Statistical methods, such as linear trend, polynomial, Mann-Kendall test and Morlet wavelet analysis were adopted for the study. The results showed that the annual occurring days of some extreme weather events, such as gale, sandstorm, thunderstorm and hail over Hainan in recent 50 years had been obviously decreased, but the heavy rain over Hainan in recent 50 years had been slightly increased, of which the abrupt change of occurrence of thunderstorm, gale, sandstorm and hail occurred around 2000, 2002, 2004 and 2005, respectively. Generally, the change frequency of heavy rain was not so obvious. In the early 1990s, the annual occurring days of gale, hail and thunderstorm were decreased, but the heavy rain was increased, in the late 1990s, the annual occurring days of thunderstorm was decreased.