滴灌条件下枣园蒸散量的显著气象因子分析

【目的】研究不同参考作物蒸散量(ET₀)与显著气象因子的相关性,分析各显著气象因子对滴灌枣园实际蒸散量(ET_c)的贡献率。【方法】在阿克苏地区枣树滴灌试验,选取Penman-Monteith(PM)、Hargreaves-Samani(HS)、Priestley-Taylo(PT)模型,采用多元线性回归分析不同ET₀的显著气象因子,以及各显著气象因子对枣园ET_c的贡献率。【结果】平均相对湿度(RH)与ET₀呈负相关,太阳辐射(R_n)、天顶辐射(R_a)、最高温度(T_max)、最低温度(T_min)、平均温度(T)、风速(U)与ET₀呈正相关;各模型的显著气象因子对ET_c贡献率为:PM-R_n(62.6%)、U(19.9%)、T(11.8%)和RH(5.7%);HS-T_max(55.1%)、T_min(30.1%)、R_a(11.6%)和T(3.2%);PT-R_n(84.1%)、T(12%)和T_min(3.9%)。【结论】T_max及R_n对滴灌枣园ET_c贡献率最大。

Study on Significant Meteorological Factors of Evapotranspiration of Jujube Orchard under Drip Irrigation

【Objective】 To study the correlation between evapotranspiration (ET₀) of different reference crops and significant meteorological factors, and the contribution rate of each significant meteorological factor to the actual evapotranspiration (ET_c) of jujube orchard under drip irrigation. 【Methods】 Based on the drip irrigation experiments of jujube trees in Aksu area, penman-Monteith (PM), Hargreaves Samani (HS) and Priestley-Taylo (PT) models were chosen to analyze the significant meteorological factors of different ET₀ and the contribution rate of each significant meteorological factor to ET_c in jujube orchard. 【Results】 Mean relative humidity (RH) was negatively correlated with ET₀, while solar radiation (R_n), zenithal radiation (R_a), maximum temperature (T_max), minimum temperature (T_min), average temperature (T) and wind speed (U) were positively correlated with ET₀. The significant meteorological factors contributed to ET_c of each model were PM-R_n (62.6%), U (19.9%), T (11.8%) and RH (5.7%).HS-T_max (55.1%), T_min (30.1%), R_a (11.6%) and T (3.2%), PT-R_n (84.1%), T (12%), and T_min (3.9%). 【Conclusion】 T_max and R_n contributed the most to ET_c in drip irrigation jujube orchard.