树冠蒸腾作用的测定是人们对树木光合作用、水分关系和生物生产力等群体水平研究的一项重要内容。彭曼—蒙蒂斯方程(Penman-Monteith eguation)运用空气动力学和能量平衡理论,借助于现代测试仪器(如气孔计、湿度计)使人们可以从生物学角度出发用微气象学方法去研究植物群体的蒸腾作用。该方程的建立和改进为研究不同植被(如森林、农作物、荒地、草原及湿地植被等)的蒸散过程提供了 The determination of crown transpiration is an important part of the population research on the photosynthesis, water relations and biological productivity of trees. Penman-Monteith eguation uses the theory of aerodynamics and energy balance, with the aid of modern testing instruments (eg, stomata, hygrometers) to enable one to study micrometeorologically from a biological point of view Transpiration of plant groups. The establishment and improvement of this equation provided the basis for studying the evapotranspiration processes of different vegetation types (such as forests, crops, wasteland, grassland and wetland vegetation)