PILOT PRODUCTION OF TRANSPIRATION MEASURING SYSTEM AND ITS PRACTICAL APPLICATION

本项目开发的蒸腾量测量系统的一个特点是：1.本测量系统具有体积小、重量轻的系统控制器、空气控制器、气体分析仪和燃烧室，便于在野外条件下使用。2.可以在自然条件下测量光合作用和蒸腾速率。该测量系统比干式进水口供气室的测量系统更好。3.研制出新型单池式气体分析仪，成功地实现了重量轻、节能、高可靠性。4.采用微型机操作测量系统，操作简单。5.通过使用高存储容量的存储器、与其他设备的各种接口和数据处理，获得了最高的效率状态。我们在山毛榉和橡树林的野外条件下对新的测量系统进行了评估，结果是不足的。由于在轻量化、高可靠性、节能的限制下，气体分析仪、湿度传感器和计算机功能的开发技术还不够，我们已经开发了一个基于单株水平估算总蒸腾量的生态生理计算机模拟模型，并利用该模型分析了间伐前后蒸腾量的差异。由于我们不能作为第一步开发新的系统，所以不可能实现硬件和软件的结合。如果我们有下一次机会，我们会努力让这个系统变得更好。

A special characteristic of transpiration measuring system developed in this project is described in following points. 1. It's easy to use this measuring system in the field condition because of small designed and light-weight system controller, air controller, gas analyzer and chamber. 2. It's possible to measure photosynthesis and transpiration rates under natural condition. It's better measuring system than that of dry-inlet supplying to chamber. 3. We can develop new single cell-type gas analyzer and are successful to make light weight, saving energy and high responsibility. 4. It's easy to operate measuring system by using micro-computer. 5. We get the highest, state of efficiency by use of high storage memory, various interfaces to another devices and data processing.We evaluated the new measuring system at the field conditions in the beech and oak forests and obtained insufficient results. Because we had not sufficient techniques developing gas analyzer, humidity sensor and function of computer under restriction of light weighting, high responsibility and saving energy.We have already developed an eco-physiological computer simulation model to estimate total transpiration based on an individual tree level and use this model to analyze the differences of transpiration before and after thinning. As we could not develop new system as a first step, it was impossible to get the combination between hardware and software. If we get the next chance, we try to make this system better.