saturation deficit

Daily whole-tree transpiration throughout the growing season ( May to October) could be well fitted to the corresponding daily total solar radiation and average daytime air vapor pressure deficit using exponential saturation functions.

辽东栎生长季内（5-10月）单株日蒸腾耗水量分别与日总太阳辐射和日均白天空气水气压亏缺进行指数饱和曲线拟合，拟合效果较好。

Penman formula was used to calculate the evapotranspiration in the upper valley of the Huanghe river since 1980.The variation tendency of some climatic factors, such as evapotranspiration, sunshine duration, air temperature, air saturation deficit and etc, were analysed.

利用彭曼公式计算80年代以来黄河上游流域蒸散量，分析了该地区蒸散量、日照时数、气温、空气饱和差等气候因子的变化趋势，并着重研究了诸因子对蒸散量的影响。

The difference in the rate of nature lose water of cutting leaf and the water saturation deficit of leaf needed to be further studied.

而品种间切叶自然失水速度和叶片水分饱和亏的差异有待进一步研究。