根际土壤湿度和叶幕微气候对葡萄叶片水分代谢影响的模拟分析  

Simulated Analysis of Effects of Soil Moisture and Canopy Microclimate on Leaf Water Metabolism in Grape

作　　者：李连国[1] 李晓燕[1] 刘志华[1] 

机构地区：[1]内蒙古农牧学院园艺系

出　　处：《果树科学》1996年第3期171-174,共4页Journal of Fruit Science

基　　金：国家自然科学基金

摘　　要：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。Methemetical simulated analysis were taken for studying the influence of soil moisture and canopy micro-climate on the leaf water potential in grape. The relationships between the soil moisture and the leaf waterpotential,stomatal resistance,transpiration may be expressed by a logistical equation. The curve of day tran-spiration rate revealed a single peak when the soil moisture content was high enough, but it revealed a bi- peak and remained low all day when the soil moisture content was low,The relationship between the cornershift and the microclimate are discussed.

关 键 词：葡萄 根际土壤湿度 叶幕微气候 水分代谢 

分 类 号：S663.101[农业科学—果树学]