气象因子的变化对参考作物蒸发蒸腾量的影响

根据东江流域1961—2005年的气象资料,利用平均影响量和气象因子缺失数值试验,分析气象因子变化对参考作物蒸发蒸腾量的影响。结果表明,日照时数的平均影响量最大,温度、相对湿度其次,二者相近,风速最小;夏季日照时数的平均影响量比其他因子大得多,冬、春季日照时数的平均影响量依然最大,但与温度、相对湿度的平均影响量差距减小...

The Impact of Change of Climate Factors on the Reference Evapotranspiration in Dongjiang River Basin

Based on the monthly historical climate dataset from 1961—2005 of Dongjiang River Basin,the impact of change of climatic factors on reference evapotranspiration(ET0) are analyzed using average impact advanced this article and numeral experimentation absenting climatic factors.Results showed that the average impact of sunlight radiation was the most,followed by relative humidity,air temperature and wind speed.The average impact of sunlight radiation was much larger than that of air temperature and relative humidity in summer.Though the average impact of sunlight radiation was the most,the difference with that of air temperature and relative humidity decrease in winter.The effect estimating ET0 with relative climatic factors and relative sensitivity coefficients was better in summer than in winter.The effect estimating ET0 weakens with decrease of the number of climatic factors,it slightly weakens in Summer,strongly weakens in Winter and Spring.The main climatic factor that impact on reference evapotranspiration is sunlight radiation in Summer,that is sunlight radiation,relative humidity.