用积分湿度指标方法评价辽西地区干旱状况  

Evaluation of Drought Status in West Liaoning Province by Integral Humidity Index

作　　者：梁群[1] 张国林[1] 刘亚林[2] 

机构地区：[1]辽宁省朝阳市气象局,辽宁朝阳122000 [2]沈阳东陵区气象局,辽宁沈阳110168

出　　处：《安徽农业科学》2010年第29期16332-16334,16337,共4页Journal of Anhui Agricultural Sciences

摘　　要：应用积分湿度指标和湿润指数评价辽西自然降水对农业需水满足的程度及旱涝状况。结果表明:近50年自然降水农业满足度平均为72%～80%,气候倾向率在-2.490%/10a～-3.656%/10a,50年趋势下降12%～18%,农业需水满足度在下降。农作物生长季缺水量在104～170mm,缺水概率有增加趋势。在作物生长季内湿润指数平均为0.55～0.75,湿润指数气候倾向率在-0.016～-0.026/10a,下降幅度在-0.080～-0.130。年景2～3级干旱出现概率在56%～94%,朝阳最重。春秋两季是干旱发生的主要时段,春季3～4级干旱出现概率58%～78%;秋季3～4级干旱出现概率42%～66%。The integral humidity indicator and sub-index are used to evaluate how the natural rainfall meet the agricultural water demand as well as the drought status in west Liaoning Province.The results indicate：the natural rainfall during late 50 years could only meet an average of 72%-80% of the agricultural water demand,the climate trend rate falls among the range of-2.490%/10a--3.656%/10a,on a decline of 12% to 18% during the late 50 years,the agricultural water demand satisfaction is declining.there is 104-170 mm water shortage during the growth season of agricultural crops,and the probability of water shortage sees an increasing trend.During the growth season of crops,the humid index is 0.55-0.75 in average,the climate trend rate of humid index is-0.016--0.026/10a,a drop of-0.080--0.130,and probability of the second and third level of drought is 56% to 94%,and Chaoyang suffers seriously.Drought usually occurs in spring and autumn,the probability of the third and fourth level of drought in spring is 58% to 78%;while that in autumn reaches 42% to 66%.

关 键 词：积分湿度指标 湿润指数 满足度 倾向率 评价 干旱 

分 类 号：S161.9[农业科学—农业气象学]