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在位于塔克拉玛干沙漠南缘的策勒绿洲对引洪灌溉后多枝柽柳清晨叶水势、水势日变化和蒸腾速率的变化特点进行了研究 .结果表明 ,灌溉后柽柳的清晨水势值 (- 0 .93MPa)比灌溉前的清晨水势值(- 1.0 4MPa)有所增加 ,但幅度不大 .因此 ,灌溉对柽柳清晨水势的恢复有一定的作用 .灌溉后柽柳水势的日变化均值 (- 2 .2 9MPa)比灌溉前的水势日变化均值 (- 1.6 9MPa)有较大降低 .灌溉后柽柳蒸腾速率的日变化值 (0 .5 0 5mmol·m-2 s-1)比灌溉前的蒸腾速率日变化值 (0 .18mmol·m-2 s-1)有较大增加 .从灌溉前后样地土壤含水量的变化和柽柳的根系分布情况看 ,这是柽柳利用地下水的结果 .柽柳通过深根系和地下水相接 ,地表灌溉对柽柳水分状况改变的作用不明显
The change of leaf water potential, water potential diurnal variation and transpiration rate in the south of Taklimakan Desert at the time of flood irrigation was studied in Cele Oasis located on the southern margin of Taklamakan Desert.The results showed that the tidal current value (-0.93 MPa ) Was higher than that in the early morning before irrigation (-1.0 4MPa), but it was not significant, therefore, irrigation had a certain effect on the recovery of water potential in Tamarix chinensis in early morning after irrigation.The average daily variation of Tamarix chinensis water potential after irrigation (-2.29MPa ) Than that before irrigation (-16 9MPa), the diurnal change of transpiration rate (0.505 mmol · m-2 s-1) of Tamarix ramosissima after transpiration was higher than that of transpiration before transpiration (0.18 mmol · m-2 s-1) increased greatly.From the changes of soil moisture before and after sampling and the root distribution of tamarisk, this is the result of tamarisk utilization of groundwater.The tamarisk through the deep root system and groundwater Conversely, the effect of surface irrigation on the change of water content in tamarix was insignificant