The applications of terahertz (THz) radiation for plant water status monitoring require systematic studies on interaction of THz wave and plants. Here, we present theoretical investigations on scattering behavior of THz waves reflected by and transmitting through a plant leaf under different water content. A theoretical model combining integral equation and radiative transfer theory is presented to fit the measured data. Good agreement confirms the availability of the model for water status evaluation when variation of leaf thickness and surface roughness is considered. We investigate the applicability of THz waves for water status monitoring in reflection and transmission geometries under different temperatures, salinities and polarizations.

太赫兹（THz）辐射在植物水分状况监测中的应用需要对太赫兹波与植物相互作用的系统研究。在这里，我们对在不同含水量下植物叶片反射和透射的太赫兹波的散射行为进行了理论研究。提出了结合积分方程和辐射传递理论的理论模型来拟合测量数据。当考虑叶片厚度和表面粗糙度的变化时，良好的一致性确认了该模型可用于水状态评估。我们研究了太赫兹波在不同温度，盐度和极化条件下反射和透射几何中水状态监测的适用性。