Irrigation with saline water is practiced in countries prone to water scarcity, in arid and semi-arid climates. In a Mediterranean climate (Sicily, southern Italy), transpiration and canopy resistance were determined in a vineyard (Syrah grafted on Paulsen 1103) irrigated with water at two salinity levels. One section of the experimental plot was irrigated with water of low salinity (electrical conductivity EC_w = 0.6 dS m⁻¹); the other section received irrigation water at higher salinity level (EC_w = 1.6 dS m⁻¹). Actual vines transpiration was measured by a thermal dissipation sap flow method, in two growing seasons (2008 and 2009). Canopy transpiration (Tr) and resistance (r_c), the latter calculated using the Penman–Monteith equation, were analyzed on hourly and daily time scale. Moreover, the trends in canopy resistance were evaluated in relation to main micrometeorological variables (global radiation and vapor pressure deficit). In the EC_{w 1.6} treatment, canopy transpiration was lower and its values, cumulated through the experimental period, were 20% and 16% lower than in the EC_{w 0.6} treatment, in 2008 and 2009, respectively. A rudimentary estimate of the relationship between cumulated canopy transpiration and soil salinity was also made, and a threshold value of relative transpiration was identified at soil electrical conductivity (EC_e) = 1.4 dS m⁻¹. Hourly values of r_c in EC_{w 1.6} were higher than in EC_{w 0.6} and the response patterns of r_c to global radiation and to vapor pressure deficit were different at different salinity levels.

在干旱和半干旱的气候中，在缺水的国家经常使用盐水灌溉。在地中海气候中（意大利南部的西西里岛），在灌溉了两个盐度的葡萄园（Syrah嫁接于Paulsen 1103上的Syrah）中确定了蒸腾和冠层阻力。用低盐度的水（电导率EC _w  = 0.6 dS m ^-1）灌溉实验区的一部分；另一部分则接受较高盐度的灌溉水（EC _w  = 1.6 dS m ^-1）。在两个生长季节（2008年和2009年），通过热流汁液流法测量了葡萄藤的实际蒸腾作用。冠层蒸腾（Tr）和阻力（r _c），后者是使用Penman-Monteith方程计算的，并按小时和每日时间范围进行了分析。此外，还与主要的微气象变量（整体辐射和蒸气压赤字）相关地评估了冠层阻力的趋势。在EC _{w 1.6}处理中，冠层蒸腾作用较低，并且在整个实验期间，其蒸腾值分别比2008年和2009年EC _{w 0.6}处理降低了20％和16％。还初步估算了冠层蒸腾量与土壤盐分之间的关​​系，并在土壤电导率（EC _e）= 1.4 dS m ^-1时确定了相对蒸腾量的阈值。r _c的小时值EC _{w 1.6的}EC值高于EC _{w 0.6，}并且r _c在不同盐度水平下对全球辐射和蒸气压亏缺的响应模式是不同的。