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在奥地利东部深厚的黄土区 ,利用石膏板小区法 ,通过测量土壤水分平衡 ,对生长在海滩的幼龄白蜡水青冈树混交林的蒸散量进行了估算 ,发现在 2 0 0 0年 4月到 2 0 0 4年 3月观察期间 ,幼龄白蜡林的年实际蒸散量达 712mm/a ,消耗了所有 6 44mm年降雨量以及 2 6 8mm的土壤储水量 ,并且没有明显深层渗漏。在根部土壤剖面平均土壤水吸力小于 0 4MPa状况下 ,主要生长季节 (6月到 9月 )的彭曼公式作物系数为 1 4 ,同时发现 ,当根部土壤剖面平均土壤水吸力为 1 7MPa时 ,该系数会线性递减至 0 2。
In the deep loess region of eastern Austria, by using the gypsum board plot method, the evapotranspiration of the young Baldrocys plantation growing on the beach was estimated by measuring the soil water balance. It was found that in April 2000, During the observation period in March 2004, the annual evapotranspiration of young white wax forest reached 712mm / a, which consumed all the rainfall of 6 44mm and the soil water storage of 268mm without obvious deep seepage. When the average soil water suction in the root soil profile was less than 0 4 MPa, the Penman formula for the main growing season (June to September) had a crop coefficient of 14, and found that when the average soil water suction in the root soil profile was 17 MPa, The coefficient decreases linearly to 0 2.