用涡度相关法测定网室内香蕉树蒸散量

Measurement of banana tree evapotranspiration in screen house using eddy covariance method

为了研究涡度相关法在网室内的适用性,于2005年6月在一个长、宽、高分别为352m、228m和6m的香蕉树种植网室内进行试验,测定的参数主要有网室内的潜热和感热、网室内的净辐射,土壤热通量和表层土壤热量。研究发现涡度相关法测定的能量和和小气候仪器测定的能量一致,说明涡度相关法可用来准确测定网室内作物的蒸散量。在试验期间(6月7日-20日),涡度相关法测定的网室内香蕉树的蒸散量在4.83～6.50mm/d之间,考虑到当地每年4～10月之间气象要素变化较小,则该文测定的蒸散量可用来指导当地网室内香蕉树的灌溉。

In order to investigate the application of eddy covariance method, an experiment was carried out to evaluate the measurement of banana tree evapotranspiration in a large-size screen house with length, width and height of 352 m,228 m and 6 m in June, 2005. Latent heat and sensible heat inside the screen house were measured using the eddy covariance method. Net radiations above banana canopy, changes of soil heat flux and soil heat storage were also measured using a meteorological system. The results show that total energy measured by eddy covariance system is same to the energy measured by meteorological system, which means the eddy covariance method can be directly used to measure the banana tree evapotranspiration （i.e the latent heat flux）. In the experiment （from Jun 7 to 21, 2005）, the banana tree evapotranspiration inside the screen house measured using the eddy covariance method ranged of 4.83- 6.50 mm/d. Considering the relative constant meteorological condition from April to October every year, the measured banana tree evapotranspiration can be used to guide the irrigation of banana plants cultivated in screen houses in this region.