PILOT PRODUCTION OF TRANSPIRATION MEASURING SYSTEM AND ITS PRACTICAL APPLICATION

本项目研制的蒸腾测量系统的特点如下：1. 系统控制器、空气控制器、气体分析仪、气室设计小巧，重量轻，便于现场使用。2. 在自然条件下测量光合作用和蒸腾速率是可能的。这是一种比干式进气阀更好的测量系统。3. 我们可以开发出新型的单细胞气体分析仪，并成功地实现了重量轻、节能、高可靠性。4. 该测量系统采用微机，操作简单。5. 我们通过使用高存储内存、与其他设备的各种接口和数据处理来获得最高的效率状态。我们在山毛榉和栎林的野外条件下对新测量系统进行了评估，结果不充分。由于在轻量化、高可靠性和节能的限制下，没有足够的技术来开发气体分析仪、湿度传感器和计算机功能。我们已经建立了基于单株水平估算总蒸腾的生态生理计算机模拟模型，并利用该模型分析了疏伐前后的蒸腾差异。由于我们不可能第一步开发新系统，因此不可能实现硬件和软件的结合。如果我们有下一次机会，我们会试着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.