策勒绿洲多枝柽柳灌溉前后水分生理指标变化的初步研究

在位于塔克拉玛干沙漠南缘的策勒绿洲对引洪灌溉后枝柽柳清晨叶水势、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（－1．04Ma）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（－2．29MPa）比灌溉前的水势日变化均值（－1．69Ma）有较大降低，灌溉后柽柳蒸腾速率的日变化值（0．505mmol.m^-2s^-1）比灌溉前的蒸腾速率日变化值（0．18mmol.m^-2s^-1）有较大增加，从灌溉前后样地土壤含水量的树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。

A preliminary study on the effect of irrigation on water physiology of Tamarix ramosissima in Cele oasis

Change characteristics of predawn water potential, water potential daily process, and transpiration rate of Tamarix ramosissima before and after irrigation was studied in Cele oasis in the south fringe of Takelamakan Desert. The results showed that the predawn water potential (-0.93 MPa) after irrigation was higher than that before irrigation (-1.04 MPa), but there was no obvious difference. So, irrigation had certain influences on the recovery of predawn water potential of T. ramosissima. The average value of water potential daily process (-2.29 MPa) after irrigation was lower than that before irrigation (-1.69 MPa). Irrigation had no influence on the increase of water potential. The transpiration rate (0.505 mmol.m-2.s-1) after irrigation was higher than that before irrigation(0.18 mmol.m-2.s-1), and compared to the soil water content and the distribution of root system before and after irrigation, it might be resulted in underground water utilization of T. ramosissima. T. ramosissima could use the underground water with its deep root system. Surface irrigation had no significant effect on the change of water condition of T. ramosissima.