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从植物生长与水分平衡的关系入手 ,在土壤水分动力学和近地面空气动力学等学科的研究基础上 ,依据植物生理生态学原理 ,探讨了干旱地区植被影响沙地水分传输的机理 ,初步建立了植被参数化模型和土壤 -植物 -大气连续体 (SPAC)水分传输综合模型。主要研究结果如下 :1分析了荒漠植物的生长及其动态变化特征 ,对沙生植物地上部与根系生长 ,尤其是根系在土壤中的分布进行了量化。 2分析了荒漠植物的蒸腾特性及其气孔调节作用机制 ,指出了土壤水分亏缺是叶片气孔关闭、蒸腾作用降低的主要原因 ,探讨了植物蒸腾作用与气孔调节之间的复杂关系及其今后的研究重点。 3揭示了沙地植被蒸发蒸腾的变化规律 ;分析了影响沙地植被蒸发蒸腾的生物因素和环境因素的作用。 4初步建立了植被参数化和 SPAC水分传输综合模型 ,模拟了植被结构影响冠层能量平衡过程 ,探讨了植物状态参数、生理参数与蒸发蒸腾的相互关系。
Based on the researches of soil moisture dynamics and near-surface aerodynamics, and based on the principles of plant physiology and ecology, this paper discussed the mechanism that vegetation affected the moisture transport in sandy land in arid areas, and initially established The vegetation parameterization model and the soil-plant-atmosphere continuum (SPAC) moisture transport model were established. The main results are as follows: 1. The characteristics of the growth and dynamic changes of desert plants were analyzed. The distributions of aboveground and root growth, especially the distribution of roots in soils, were quantified. The transpiration characteristics and stomatal regulation of desert plants were analyzed. It was pointed out that soil water deficit was the main reason for the stomatal closure and transpiration decrease, and the complex relationship between plant transpiration and stomatal regulation was discussed research focus. 3 reveals the variation law of evapotranspiration in sandy land; analyzes the effect of biological factors and environmental factors on evapotranspiration in sandy land. 4 A comprehensive model of vegetation parameterization and SPAC moisture transport was preliminarily established to simulate the energy balance process of canopy influenced by vegetation structure and the relationship between plant state parameters, physiological parameters and evapotranspiration was discussed.