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中文摘要：
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。用相对敏感系数和气象因子的相对变化量对参考作物蒸发蒸腾量进行估算,夏季的预测效果比冬春季好;随输入气象因子数量的减少,预测效果降低,夏季降低不明显,冬春季降低明显。夏季东江流域参考作物蒸发蒸腾量的主要气象影响因子是日照时数,冬、春季是日照时数和相对湿度。
英文摘要：
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.
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