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为探讨土壤水分、光照等环境因子对华南8号木薯气孔导度的影响,构建气孔导度与相关环境因子的数学模型,设置7个土壤水分梯度(相对含水量20%～80%),盆栽华南8号木薯,测量净光合速率、气孔导度和空气相对湿度等参数。结果表明:空气相对湿度与气孔导度之间呈极显著正相关;光合有效辐射、土壤相对含水量与气孔导度之间呈显著正相关,但它们对气孔导度的影响程度随土壤相对含水量的变化而变化,当土壤相对含水量较低时,土壤相对含水量是影响气孔导度的主导因子,而当土壤相对含水量较高时,光合有效辐射是影响气孔导度的主导因子;土壤相对含水量、光合有效辐射、空气相对湿度与气孔导度的关系可用指数模型表达;华南8号木薯的适宜土壤相对含水量的低限临界值为52%。
In order to explore the effects of environmental factors such as soil moisture and light on the stomatal conductance of cassava in South China, a mathematical model of stomatal conductance and related environmental factors was constructed. Seven soil moisture gradients (relative water content 20% ~ 80% South China No. 8 cassava, net photosynthetic rate, stomatal conductance and air relative humidity and other parameters. The results showed that there was a significant positive correlation between air relative humidity and stomatal conductance. There was a significant positive correlation between photosynthetic active radiation and soil relative water content and stomatal conductance, but their influence on stomatal conductance varied with stomatal conductance When the soil relative water content is low, the soil relative water content is the dominant factor that affects stomatal conductance. When the soil relative water content is higher, photosynthetically active radiation is the dominant factor affecting stomatal conductance. The relationship between soil relative water content, photosynthetically active radiation, air relative humidity and stomatal conductance can be expressed by exponential model. The lower limit of relative water content of South China No. 8 cassava is 52%.