太子河流域参考作物腾发量演变特征及气候影响因素分析

Analysis of the change characteristics and effect factors of reference evapotranspiration in Taizi river basin

摘要: 采用太子河流域内8个气象站1960～2005年间气象资料，应用Penman-Montieth公式计算了46年间逐月参考作物腾发量(ET₀)，对参考作物腾发量及气象要素的年际变化特征、月际变化特征及趋势进行了分析，应用统计检验方法分析了影响流域参考作物腾发量变化的主要气象因素。结果表明：近46年间太子河流域ET₀值呈现缓慢下降趋势，年内ET₀值分布以5、6月份最高，1月份最低。影响ET₀的主要气候要素按影响程度强弱依次为日照、风速、温度、相对湿度。

Abstract: In this paper, based on the meteorological data of the eight weather stations in Taizi river basin from 1960 to 2005, monthly reference evapotranspiration(ET₀) was calculated by the Penman-Montieth formula, the characteristics and trend of ET₀ and meteorological factors changed with year and month were analyzed, and the main factors affected ET₀ were discussed with statistic method also. The results show that the ET₀ in the Taizi river basin is decreased slowly over the past 46 years. The ET₀ in May and June is the highest and that of in January is the lowest in the year. The sequences of the main factors affected ET₀ are sunshine time, wind velocity, temperature and relative humidity.