黑河中游几种沙生植物的光合特征比较

Comparative Study on Photosynthetic Characteristics of Several Psammophytes in the Middle Area of Heihe

以黑河中游地区4种沙生植物梭梭、柽柳、花棒和柠条作为研究对象,在干旱条件下对光合特征进行比较。结果表明:柽柳和花棒的净光合速率日变化呈双峰型,有"午睡"现象,而梭梭和柠条呈单峰型,无"午睡"现象出现。在水分利用方面,梭梭和柽柳有较高的利用效率,花棒和柠条则对水分的利用效率较低。柠条的蒸腾速率在4种植物中处于较高水平,其他3种都处于较低水平。

Take the four kinds of Psammophytes of Haloxylon ammodendron, Tamarix chinensis, Hedysarum seoparium, Caragana korshinskii as the research subject in the middle areas of Heihe, compared their photosynthetic characteristics under the dry conditions. The result showed that, the change of photosynthetic rate of Tamarix chinen- sis and Hedysaram scoparium showed the type of two-peaks and the ＂midday depression＂ phenomenon, the Haloxylon ammodendron and Caragana korshinskii showed the one-peak. In terms of water use, Haloxylon ammodendron and Tamarix chinensis have the higher efficiency; Hedysarum scoparium and Caragana korshinskii are lower relatively. The Caragana korshinskii has the highest transpiration rate in the four plants, the others lay a lower level.