Development of a supersonic pan-evaporimeter for dynamic analysis of evaporative demand in a greenhouse
Development of a supersonic pan-evaporimeter for dynamic analysis of evaporative demand in a greenhouse
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DOI：
10.2480/agrmet.67.3.5
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发表时间：
2011-03
影响因子：
1.3
通讯作者：
D. Yasutake;Masumi Ishikawa;M. Mori;K. Miyauchi;M. Kitano
中科院分区：
文献类型：
--
作者：
D. Yasutake;Masumi Ishikawa;M. Mori;K. Miyauchi;M. Kitano
研制了一种用于温室蒸发量动态分析的超音速泛蒸仪。蒸发器由两个部分组成：一个装满水的小型圆柱形容器（直径27厘米，高度15厘米）和一个超音速水位探测器。蒸发皿蒸发速率（Epan）可以在任意时间间隔内根据蒸发皿蒸发引起的水位下降来计算。通过逐时分析Epan的特征及其与太阳辐射、气温、湿度、风速、温室番茄植株蒸腾速率（Tr）的关系，验证了pan蒸计的性能和有效性。逐时Epan与环境要素之间存在明显的正线性关系，从而揭示了Epan对环境要素的敏感性。此外，Epan和Tr在某一天的小时基础上具有良好的相关性。这些结果表明，所研制的泛蒸仪是分析温室蒸发需求动态和估算温室蒸腾速率的有用工具。
A supersonic pan-evaporimeter was developed for performing dynamic analysis of evaporative demand in a greenhouse. The pan-evaporimeter comprises two parts: a small-sized cylindrical container (a diameter of 27 cm, a height of 15 cm) filled with water and a supersonic water-level detector. The pan evaporation rate (Epan) can be evaluated for an arbitrary time interval on the basis of the decrease in the water level due to evaporation from the pan-evaporimeter. The performance and validity of the panevaporimeter were examined by analyzing the characteristics of Epan on an hourly basis and its relation with the solar radiation, air temperature and humidity, wind speed, in addition, the transpiration rate of a tomato plant (Tr) in a greenhouse. A positive linear relationship was clearly obtained between the hourly Epan and the environmental elements, and then sensitivity of Epan to the environmental elements was revealed. Furthermore, a good correlation was found between the Epan and the Tr on hourly basis for one day. These results suggest that the developed pan-evaporimeter is a useful tool for analyzing the dynamics of evaporative demand and for estimating the transpiration rate in a greenhouse.