液流—株间微型蒸渗仪法测定新疆杨蒸发蒸腾量适用性分析

Applicability analysis for measuring evapotranspiration of Populus alba var. by sap flow and micro-lysimeter method

采用液流—株间微型蒸渗仪法测定人工种植环境下新疆杨蒸发蒸腾量,并对此方法的适用性进行了分析。结果表明:在生长季5—10月,新疆杨蒸腾量具有明显的季节变化规律,总蒸发蒸腾量为508.26mm,蒸发量、蒸腾量所占比率分别为37.1%和62.9%;树干液流速率与叶片蒸腾速率变化表现出较好的一致性,热脉冲法能够用于新疆杨蒸腾测定;液流—株间微型蒸渗仪法和水量平衡法测算结果的相对误差在±15%之内,液流—株间微型蒸渗仪法能够适用于新疆杨蒸发蒸腾量测定。

Using the Sap flow and Micro-lysimeter methods have measured the evapotranspiration of Populus alba var .and analyzed its applicability .The results showed that ：The evapotranspiration of Populus alba var .has changed seasonally .In the growing season from May to October ,the overall evapotranspiration was 508 .26 mm ,with the proportion of 37 .1% and 62 .9% for evaporation and transpiration ,respectively .The tree trunk sap velocity was in good agreement with the leaf transpiration rate .It was indicated that heat pulse method can be used to measure the transpiration of Populus alba var ..The relative error was within ±15% compared the Sap flow and Micro-lysimeter method with the water balance method .So the Sap flow and Micro-lysimeter methods were suitable to measure the evapotranspiration of Pop-ulus alba var .