COMPARISON OF VAPOR-PRESSURE-DEFICIT CALCULATION METHODS - SOUTHERN HIGH-PLAINS
COMPARISON OF VAPOR-PRESSURE-DEFICIT CALCULATION METHODS - SOUTHERN HIGH-PLAINS
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DOI：
10.1061/(asce)0733-9437(1995)121:2(191
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发表时间：
1995-03-01
影响因子：
2.6
通讯作者：
DUSEK, DA
中科院分区：
文献类型：
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作者：
HOWELL, TA;DUSEK, DA
蒸压亏缺（VPD）影响作物的蒸散量、水分利用效率和辐射利用效率。针对南部大平原的半干旱环境评估了VPD计算方法。在1992年和1993年期间，测量了德克萨斯州布什兰附近的空气温度和相对湿度。在0.17 Hz（6 s）下测量温度和相对湿度，记录每15 min的平均值，并记录每日（24 h）最大值、最小值和平均值。VPD，实际蒸汽压和露点温度进行计算，并平均为每15分钟的时间和天。使用平均日露点温度计算每日实际蒸汽压的方法表现良好，使用基于最高和最低空气温度和相对湿度的混合计算的方法表现最差。在这种环境中，应谨慎使用1990年ASCE手册第70号建议的一天一次露点温度的方法。包含最高和最低温度以及每日平均露点温度的天气数据集应提供这种环境下VPD的最准确计算。
Vapor-pressure deficit (VPD) affects evapotranspiration, water-use efficiency, and radiation-use efficiency of crops. VPD calculation methods were evaluated for a semiarid environment in the Southern Great Plains. Air temperature and relative humidity were measured near Bushland, Texas, during 1992 and 1993. Temperature and relative humidity were measured at 0.17 Hz (6 s), averages were recorded for each 15-min period, and daily (24-hr) maximums, minimums, and averages were recorded. VPD, actual vapor pressure, and dew-point temperatures were computed and averaged for each 15-min period and day. Methods that used mean daily dew-point temperature to compute daily actual vapor pressure performed well, and methods that used hybrid calculations based on maximum and minimum air temperature and relative humidity performed the worst. Methods using one-time-of-day dew-point temperatures as recommended by the 1990 ASCE Manual No. 70 should be used with caution in this environment. Weather data sets containing maximum and minimum temperatures and daily mean dew-point temperature should provide the most accurate calculations of VPD in this environment.