利用蒸发计估测参考作物蒸发蒸腾量的试验研究

根据联合国粮农组织推荐的方法估算参考作物蒸发蒸腾量(ET0)需要具备一定的气象资料,而使用另一种方法,即蒸发计估测ET0,可以减少基于作物蒸发蒸腾量制定灌溉制度的工作量,并且降低其复杂度。在叙述蒸发计构造及使用方法的基础上,介绍了一些研究者在不同气候条件下对蒸发计估测ET0准确度的试验研究。试验表明,在缺乏标准气象资料时,可以利用蒸发计来可靠地估测农场或更广阔领域的ET0。

Experimental study on application of evapotranspirometers to reference crop evapotranspiration estimates

Reference crop evapotranspiration(ET_0) estimates on the basis of FAO recommended methodology require some meteorological data;however another approach,i.e.the use of evapotranspirometers for ET_0 estimates,can reduce the work load and decrease the complexity associated with ET_0-based irrigation scheduling.Based on analysis of the structure and utilization method of evapotranspirometers,an introduction was given to some experimental studies on the reliability of ET_0 estimates by use of evapotranspirometers under different meteorological conditions.The result shows that evapotranspirometers can be used for reliable estimates of ET_0 of farmland and even wide ranges when normal meteorological data are not available.