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在盆栽条件下取得初级数据以后进行数学模拟和分析。结果表明：根际土壤湿度对葡萄叶片水分代谢过程影响显著。根际土壤湿度与叶片水势（ψ_(ＷＬ)）、气孔扩散阻力（Ｒ_s）、蒸腾速率（Ｔ_ｒ）的关系可用相应的Ｌｏｇｉｓｔｉｃ方程表示。方程的拐点被定义为根际土壤湿度阀值。根际土壤湿度对叶片水分代谢的进程也有影响。供水充足的植株，叶片蒸腾速率（Ｔ_ｒ）在一日内都维持较高水平，呈单峰曲线型。而水分亏缺植株，则表现出明显的“午休”现象，且一日内蒸腾作用很弱。叶幕微气候诸因子对葡萄叶片水分代谢的影响作用较为复杂，基本遵循多元线性相关关系。建立了Ｒ_ｓ、Ｔ_ｒ与叶幕微气候诸因子的关系模型。进一步分析了葡萄根际土壤湿度阀值漂移与叶幕微气候因子的关系，结果表明：随光照增强、温度升高、湿度下降，阀值增大。
After the primary data was obtained under potting conditions, the mathematical simulation and analysis were carried out. The results showed that rhizosphere soil moisture had a significant effect on the water metabolism of grape leaves. The relationships between rhizosphere soil moisture and leaf water potential (ψ WL, stomatal diffusion resistance R es, transpiration rate T r) can be expressed by Logistic equation. The inflection point of the equation is defined as the rhizosphere soil moisture threshold. Rhizosphere soil moisture has an impact on the process of leaf water metabolism. Water sufficient plants, leaf transpiration rate (T_r) were maintained at a high level within a day, was a single peak curve type. The water deficit plants showed obvious “lunch break” phenomenon, and the transpiration was weak within one day. Leaf microclimate factors on grape leaf moisture metabolism is more complex, basically follow the multiple linear correlation. The relationship model between R_s, T_r and leaf microclimate factors was established. The relationship between the threshold humidity and leaf microclimate was also analyzed. The results showed that the threshold value increased with the increase of illumination, temperature and humidity.