聊城市参考作物蒸散量的多时间尺度特征及影响因子

为聊城市估算和科学分析作物需水量提供依据,选取1961—2015年聊城市8个气象观测站点的逐日气象资料,应用Penman-Monteith法计算该地区参考作物蒸散量(ET0),并与气象因子进行相关性分析。结果表明:参考作物蒸散量的日值为3.04mm,年内极大值呈下降趋势,极小值呈上升趋势;月值1月最小(30.88 mm),6月最大(164.48 mm);春、夏、秋、冬各季值分别为332 mm、435 mm、237 mm和102mm;年值为1108mm;不同尺度的参考作物蒸散量呈下降趋势。参考作物蒸散量与日气象因子气温、风速、日照时数呈正相关,与相对湿度呈负相关,其中与最高气温的典型相关系数最高,达0.841 3。不同尺度的参考作物蒸散量下降的主要影响因素为平均风速和日照时数。

Multiple Time Scale Characteristics and Impact Factors of the Reference Crop Evapotranspiration in Liaocheng City

To provide references for evaluating and scientifically analyzing water requirement of crop,based on the daily meteorological data of eight meteorological observation sites in Liaocheng City from 1961 to 2015,the reference crop evapotranspiration was calculated by Penman-Monteith method,and the correlation analysis was made with meteorological factors.Results:The average daily evapotranspiration was 3.04 mm,and the maximum value decreased with the lowest value (30.88 mm) in January and the largest in June (164.48 mm).The reference crop evapotranspiration was 332 mm,435 mm,237 mm and 102 mm,respectively,and the reference crop evapotranspiration was 1 108 mm.The evapotranspiration of reference crop decreased at different scales.The reference crop evapotranspiration was positively correlated with the weather,air velocity and sunshine hours,and was negatively correlated with relative humidity.The highest correlation coefficient with the highest temperature was 0.841 3.The main influencing factors of the reference crop evapotranspiration at different scales were average wind speed and sunshine hour.