台湾泥岩恶地适生植物蒸发散模式之研究

Study on the Evapotranspiration Model for Fitted Plant in Taiwan Mudstone Area

盆栽植物蒸发散之量测不仅可作为植物水分需求之依据 ,且可配合相关理论推导之蒸发散物理模式 ,以量化小区域内温度、湿度等微气候之变化。本研究之目的在探讨二种台湾西南部泥岩地区之适生植物 ,其环境日射量、饱和蒸气压差与蒸发散之关系模式 ,而植物蒸发散量之量测方式则以重量差值法代表 ,并经由物理、数学理论推导与统计回归分析结果 ,所建立之蒸发散量 (ET)最佳物理推估模式为日射量 (Rs)与饱和蒸气压差 (VPD)之线性函数。微气候因子之日射量、饱和蒸汽压差、土温及土壤水分含量等对二种植物之蒸发散量予以量化 。

The measurement of evapotranspiration for the potted plant could take as required water index for the fitted plants and could quantify these changes of microclimate at local region.The evapotranspiration model also could incorporate into the microclimate model to quantify the humidity ratio of the inner air. The purpose of this study is to utilize solar radiation(Rs)and saturated vapor pressure difference(VPD) to get evapotranspiration (ET)physical model. In order to get the best model, physics theorem, mathematics theorem, and statistics tools combined to infer evapotranspiration model. The weight measurement technique was adopted and a measured device was established.According to micrometeorology, solar radiation and vapor pressure margin are function of evapotranspiration. The evapotraspiration was studied as a function of solar radiation and vapor press deficit by physical formula proposed and regression analysis. The experiment results indicated that the evapotranspiration was significant.