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采用四川盆地89个气象台站1961-2008年实测气象资料,计算了各站历年各季的湿润指数,并利用湿润指数,分析了四川盆地的农业干旱发生频率、发生范围及发生强度变化特征,并以2006年川渝特大干旱过程为例探讨了湿润指数对四川盆地农业干旱评价的适用性,结果表明:采用湿润指数评价农业干旱是可行的;各季农业干旱中春旱发生最为频繁,夏旱次之,伏旱最少;春旱发生范围最广,伏旱最小;干旱平均强度,以春旱强度最高,夏旱次之,伏旱最弱.
Based on the measured meteorological data of 89 meteorological stations in Sichuan Basin from 1961 to 2008, the wetland index of each station in each calendar year was calculated. Based on the wetness index, the frequency, occurrence range and occurrence intensity of agricultural drought in Sichuan Basin were analyzed. Taking 2006 Sichuan-Chongqing special drought process as an example, the applicability of wetness index to agricultural drought evaluation in Sichuan Basin was discussed. The results showed that it is feasible to evaluate agricultural drought by using wetting index. The drought occurred most frequently in agricultural drought in each season. Followed by the least amount of drought; the most extensive is the spring drought and the lowest is the summer drought; the average intensity of drought is the highest in spring, followed by the summer and the lowest in summer.