元阳哈尼梯田降水和蒸发量变化特征及趋势分析

Analysis on Change Characteristic and Trend of Precipitational and Evaporational of Hani Terrace in Yuanyang County

根据元阳县1958-1996年各月的降水量和蒸发量统计资料,运用回归分析、Mann-Kendall非参数检验、小波分析方法进行研究,分析了元阳哈尼梯田39a来降水量和蒸发量的变化特征及变化趋势。研究结果表明:哈尼梯田年内降水量分配不均;年际降水量变化大,经一元线性回归分析和Mann-Kendall非参数检验,发现哈尼梯田年降水量趋势不显著;蒸发量的年内变化很不均匀,而年际变化比较稳定,蒸发量呈下降的趋势;年降水量和蒸发量变化并非线性的持续增加或减小的,存在明显的3～35a的动态变化周期。

According to the monthly precipitational and evaporational datas from 1958 to 1996 provided by hydrographic office of the Newjie town of Hani Terrace in Yuanyang county,using regression analysis,Mann-Kendall non-parameter test and wavelet analysis methods,this paper analyzed the precipitation and evaporation change characteristic,precipitation and evaporation change trend in past 39 years in Hani Terrace of Yuanyang county.The results show that the annual distribution of rainfall of Yuan Yang Hani Terrace is uneven;the inter-annual precipitation change is large.Through the linear regression analysis and Mann Kendall non-parameter test,it can be found that the annual precipitation change trend of Yuan Yang Hani Terrace is not significant,the annual evaporation trend is uneven,and the interannual variations of evaptration are relatively stable,the change trend of future trend of evaporation is still decreasing;the annual precipitation and evaporation change is not linear continuous increasing or decreasing,exists obvious dynamic change cycle of 3 ~ 35 years.