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P-SD、P-ND曲线法在林木组织水分状况动态监测中有较大价值。主成份分析表明;渭北旱原泡桐水分关系的主要环节是组织水分状况、蒸腾耗水、土壤供水三方面。三者呈良好的线性关系。通径分析表明:影响泡桐蒸腾强度大小的次序是气温、照度、湿度、风速、土壤含水量。渭北旱原泡桐在7—8月耗水量最大,6—7月土壤供水最差。
P-SD, P-ND curve method has great value in the dynamic monitoring of water status of forest wood. The principal component analysis showed that the main factors of the water relationship of the Paulownia in the Weibei upland were the status of tissue water, transpiration and water consumption, and soil water supply. The three showed a good linear relationship. Path analysis showed that the order of influencing the transpiration intensity of Paulownia was temperature, illumination, humidity, wind speed and soil water content. Weibei drylands Paulownia in July-August the largest water consumption, June-July soil water supply was the worst.