用积分湿度指标方法评价辽西地区干旱状况

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%。

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

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...