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中文摘要：
研究了甘肃石羊河流域干旱荒漠区天然生长条件下花棒的蒸腾耗水规律．结果表明：花棒木质部液流速率随探针插入深度的加大呈“高-低”变化趋势；主根直径较小的花棒各位点的平均液流速率上升速度较快，变幅较大；不同主根直径花棒的液流量相差较大，但变化趋势较为一致，即昼夜变幅较大，夜间液流量较小，白天液流量较大，呈多峰曲线；日液流量与蒸发蒸腾量ET0呈线性相关，蒸腾耗水主要在6-9月，占生长季总蒸腾量的79．04％；花棒生长后期日液流量与0—50cm深沙层含水量呈显著相关，与其它层含水量无明显相关性；气象因素对花棒树干液流量影响的大小表现为日均气温〉空气水汽压差〉风速．
英文摘要：
By using heat pulse technique, an investigation on the transpiration of Hedysarum scopa- rium was conducted in the arid desert region of Shiyang River basin, Gansu Province. The results indicated that with increasing inserted depth of probe, the sap flow velocity in H. scoparium xylem had a trend from high to low. In the taproot with smaller diameter, the average sap flow velocitY at different positions was faster, and the change range was bigger. Among the taproots with different diameters, there existed a larger difference in the magnitude of sap flux, but the change trend was similar, i.e. , smaller at nighttime and larger at daytime, and showing a multi-peak curve. A linear correlation was observed between the diurnal sap flux and the reference crop evapotranspiration, and the transpiration mainly occurred during the period from June to September, occupying 79.04% of the total annual transpiration. The diurnal sap flux of 11. scoparium at its later growth period had significant correlation with the moisture content in 0-50 cm sand layer, but no correlations with that in other sand layers. The effects of main meteorological factors on the sap flux of H. scoparium were in the sequence of air temperature 〉 vapor pressure difference 〉 wind speed.
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