阿拉善荒漠区主要盐生植物水势日变化

The daily water potential dynamic of main halophytes in the Alaxia desert region

以内蒙古阿拉善盟荒漠区的代表性盐生植物胡杨(Populus euphratica)、柽柳(Tamarixramosissi ma)、梭梭(Haloxylon ammodendron)、沙枣(Elaeagnus angustifolia)和小叶杨(P.si monii)等5种优势植物为研究对象,对其叶片水势的日变化进行了测定。结果表明,植物叶形、植物种和植物生态分布影响叶片水势的日变化。水势从小到大的排序为,肉质圆柱形叶<阔叶植物叶,柽柳<梭梭<小叶杨<沙枣<胡杨,胡杨卵圆形叶<胡杨披针形叶,雅布赖盐池的柽柳和梭梭<吉兰泰盐池的柽柳和梭梭<额济纳旗河岸的柽柳和梭梭。

The daily water potential dynamic of Populus euphratica, Tamarix ramosissima, Haloxylon ammodendron, Elaeagnus angustifolia and Populus simonii in the Alaxia desert region of Inner Mongolia were determined in this study. The results of this study showed that the shapes of leaves, plant species and plant distributing influenced the daily water potential dynamics. The water potential among shapes of leaves was columniform-leaf〈broad-leaf, and the water potential among plant species showed as T. rarnosissima〈H, ammodendron〈P, simonii〈E, angustifolia〈P, euphratica. The water potential of the ovatus-leaf was bigger than that of the laneeolatus-leaf for P. euphratica. The water potential of T. ramosissima and H. ammodendron at the different locatiion showed in order.. Yabrai region〈Jartai region〈Ejin region.