中文摘要：

作为处于水平衡的一个主要部件，土壤水分蒸发蒸腾损失总量为水节省并且灌溉措施做是很重要的，特别在干旱或半干旱的区域。尽管土壤水分蒸发蒸腾损失总量的研究很长时间被进行了，研究专注于绿洲沙漠转变地区很被限制。根据气象学的数据和另外的参数(例如叶区域索引( LAI ))在从 2005～2011 的 Heihe 河的中间的流的一个绿洲沙漠转变地区，这份报纸计算了两引用( et <潜水艇class=“ a-plus-plus ”> 0 )和实际土壤水分蒸发蒸腾损失总量( et <潜水艇class=“ a-plus-plus ”>用 FAO56 Penman-Monteith 和 Penman-Monteith 的 c )分别地当模特儿。在有平底锅蒸发的联合(E < 潜水艇 class= “ a-plus-plus ” > p ) 由 E601 平底锅蒸发器测量了，四个方面被分析：(1 ) et < 潜水艇 class= “ a-plus-plus ” > 0 被 E 第一验证 < 潜水艇 class= “ a-plus-plus ” > p ；(2 ) et 的特征 < 潜水艇 class= “ a-plus-plus ” > 0 和 et < 潜水艇 class= “ a-plus-plus ” > c 被比较，当影响因素也被分析时；( 3 )后来气象学的数据为估计 et 经常是无法获得的<潜水艇class=“ a-plus-plus ”>通过在这个区域的 FAO56 Penman-Monteith 模型的 0 ，平底锅蒸发系数( K <潜水艇class=“ a-plus-plus ”>当使用观察 E 时， p )是很重要的<潜水艇class=“ a-plus-plus ”>预言 et 的 p <潜水艇class=“ a-plus-plus ”> 0 。在这种情形下面， K 的一个实验公式 < 潜水艇 class= “ a-plus-plus ” > p 为这个区域被提出；(4 ) 收割系数(K < 潜水艇 class= “ a-plus-plus ” > c ), 反映土壤水分蒸发蒸腾损失总量的一个重要索引，也被分析。结果显示出那个平均数 et 的年度价值 < 潜水艇 class= “ a-plus-plus ” > 0 和 et < 潜水艇 class= “ a-plus-plus ” > c 分别地是 840 和 221 公里。在每日的底上， et < 潜水?

英文摘要：

As a main component in water balance, evapotranspiration is of great importance for water saving and irrigation-measure making, especially in arid or semiarid regions. Although studies of evapotranspiration have been conducted for a long time, studies concentrated on oasis-desert transition zone are very limited. On the basis of the meteorological data and other parameters（e.g. leaf area index（LAI）） of an oasis-desert transition zone in the middle stream of Heihe River from 2005 to 2011, this paper calculated both reference（ET0） and actual evapotranspiration（ETc） using FAO56 Penman-Monteith and Penman-Monteith models, respectively. In combination with pan evaporation（Ep） measured by E601 pan evaporator, four aspects were analyzed：（1） ET0 was firstly verified by Ep;（2） Characteristics of ET0 and ETc were compared, while the influencing factors were also analyzed;（3） Since meteorological data are often unavailable for estimating ET0 through FAO56 Penman-Monteith model in this region, pan evaporation coefficient（Kp） is very important when using observed Ep to predict ET0. Under this circumstance, an empirical formula of Kp was put forward for this region;（4） Crop coefficient（Kc）, an important index to reflect evapotranspiration, was also analyzed. Results show that mean annual values of ET0 and ETc were 840 and 221 mm, respectively. On the daily bases, ET0 and ETc were 2.3 and 0.6 mm/d, respectively. The annual tendency of ET0 and ETc was very similar, but their amplitude was obviously different. The differences among ET0 and ETc were mainly attributed to the different meteorological variables and leaf area index. The calculated Kc was about 0.25 and showed little variation during the growing season, indicating that available water（e.g. precipitation and irrigation） of about 221 mm/a was required to keep the water balance in this region. The results provide an comprehensive analysis of evapotranspiration for an oasis-desert transition zone in the middle stream of Hei