We measured evapotranspiration rate for tall trees, we developed a new weight scale able to measure the amount of evapotranspiration from a large, full-sized tree, and is using the large-sized scale to carry out long-term measurements comparing the evapotranspiration of individual trees and those located in forests.

The amount of transpiration per unit leaf area of isolated and forest edge individuals during the summer was 1.71 times for isolated individuals.

It was clarified under the condition that all the measurement time, weather condition, tree standard, tree kind, planting base were all aligned, and it was able to confirm the difference in transpiration amount due to difference in planting density by the Lysimeter method.

This study considers the difference due to the arrangement of trees and isolated individuals in the forest by the measurement by the real trees for the first time by the trees of the real size growing in the city as a street tree and a park tree.

From the results of this study, it was suggested that evaluating the existence effect of trees more accurately, and appropriately arranging the trees in the urban area contribute to improvement of the urban environment, especially the thermal environment effect.

我们测量了高大树木的蒸散量，我们开发了一种新的体重秤，能够测量大型全尺寸树的蒸散量，并且正在使用大型秤进行长期测量，比较个体的蒸散量树木和森林中的树木。

在夏季，孤立的和森林边缘的个体的单位叶面积的蒸腾量是孤立的个体的1.71倍。

在所有测量时间，天气条件，树木标准，树木种类，种植基地都对齐的情况下进行澄清，并且可以通过Lysimeter方法确认由于种植密度的差异而造成的蒸腾量的差异。

这项研究通过第一次以真实树木的测量，以城市中生长为街道树木和公园树木的实际大小树木的测量结果，来考虑由于森林中树木和孤立个体的排列而引起的差异。

根据研究结果，建议更准确地评估树木的存在效果，并在市区内合理布置树木有助于改善城市环境，特别是热环境效应。