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该文介绍了测定林分蒸散耗水量的方法，对主要测定方法的原理、特点和适用范围进行了分析．比较蒸散的测定方法，水文法适用性较强，它不受时间、气象条件、林分条件的限制，可用于一周以上较长时段的总蒸散量测定，还可测定各种林分、流域的蒸散耗水量；微气象法适用林相整齐均一的林分，可对林分或区域森林蒸散进行测定；植物生理法可测定树种个体耗水量；蒸发器适用测定树木个体蒸散及林地土壤蒸发量，条件易于控制，测量精度高；气候学方法适用估算一个地区潜在蒸散量和相对耗水量；遥感方法可用来估算区域森林蒸散量．
This paper introduced the method of determining the water consumption of evapotranspiration in forest and analyzed the principle, characteristics and applicable scope of the main measurement methods. Compared with the method of evapotranspiration, the hydrological method is more applicable. It is not limited by time, meteorological conditions and stand conditions. It can be used for the determination of total evapotranspiration over a long period of more than one week. Evapotranspiration water consumption; Micro-meteorological method for neat uniform forest stand, forest or regional forest evapotranspiration can be measured; Plant Physiological method can determine individual tree species water consumption; Evaporator for measuring individual tree evapotranspiration and woodland soil evaporation, conditions Easy to control and high accuracy. Climatological method is suitable for estimating potential evapotranspiration and relative water consumption in a region. Remote sensing method can be used to estimate regional forest evapotranspiration.