近58年桓仁县暖干化趋势与土壤蒸发量特征分析

Analysis on Warming and Drying Trends and Characteristics of Soil Evaporation in Huanren County in Recent 58 Years

利用桓仁县1953 ～2010年逐月气温、降水和相对湿度资料,运用线性趋势分析、干燥度和伊万诺夫蒸发量等分析方法,对桓仁县58年来温度、降水和土壤蒸发量进行分析.结果表明,近58年桓仁县年平均气温呈明显的升高趋势,降水为下降趋势,暖干化趋势明显;月土壤蒸发量与降水量一样具有峰谷变化,土壤蒸发量5月最大,1月最小;58年来年土壤蒸发量呈增加趋势,线性倾向率为2.95mm/10a,土壤蒸发量除夏季为减少趋势外,其他各季为增加趋势;土壤蒸发量受降水量影响较大,若春季、夏季、秋季、冬季和年降水量增加10 mm,土壤蒸发量将分别减少3.58、1.20、1.51、2.48和2.48 mm.

Using monthly temperature,precipitation and relative humidity data in Huanren County during 1953-2010,adopting the linear trend analysis,aridity and evaporation Ivanov,temperature,rainfall and soil evaporation was analyzed.The results showed Huanren County average annual temperature lies in the increased trend changes,changes in precipitation for downward trend,warming and drying trend is obvious.As peak and off-peak month evaporation and precipitation changes,soil evaporation May the biggest January minimum.58-year variation of soil evaporation shows an increasing trend in the coming year,the linear trend rate of 2.95 mm/10 a.Except for summer,other seasons soil evaporation show increasing trend.Precipitation has great influence on soil evaporation,if spring,summer,autumn,winter and the annual precipitation increases by 10 mm,soil evaporation decreases respectively 3.58,1.2,1.51,2.48 and 2.48 mm.