中文摘要：

古尔班通古特沙漠冬季稳定积雪期长，多雾凇天气。通过2007年11月-2008年3月在沙漠南缘的定位实验观测，发现植物雾凇凝结水总量平均为5．8mm，占冬季降水量的21．8％，其中，沙漠区垄间和垄上植物雾凇凝结水总量分别是3．8mm和9．1mm，各占冬季降水量的14．4％和34．3％；植物雾凇凝结水量是雪面凝结水量的5倍；荒漠植物的雾凇凝结水可以增加古尔班通古特沙漠冬季植被分布区域水资源量。雾凇形成的最大风速一般小于3m／s；-15℃～-20℃是雾凇形成次数最多的气温区间，占全部雾凇日数的24．3％，气温低于-30℃时雾凇凝结量显著减少；观测期雾凇形成时大气最大相对湿度小于80％的日数占冬季雾凇日数的41％。低温、高湿、低风速的气象条件，加之梭梭枝条的细直径和针状叶特征，是古尔班通古特沙漠冬季具有丰富植物雾凇凝结水的重要原因。

英文摘要：

There are long winter seasons with stable snow cover and frequently rime phenomena in the Gurbantunggut Desert in China. Based on the rime observations from November 2007 to March 2008 at the experimental sites on the southern margin of the Gurbantunggut Desert, we find that the average water equivalent of rime condensation on desert shrub crowns is 5.8 mm, about 5 times more than that on snow surfaces, and accounts for 21.8% of the total winter precipitation. The values of rime-fall on plants on the top and foot of longitudinal dunes are 3.8 mm and 9. 1 mm respectively, which amount to 14.4% and 34.3% of the total winter precipitation, respectively. The rime condensation provides an important moisture input to the shrub cover regions of the Gurbantunggut Dsert during the winter seasons. The maximum wind speed for rime formation is usually less than 3 m/s. The most frequent temperature for rime formation range between - 15℃ and -20℃, which accounts for 24. 3% of the total rime events. The rime-fall significantly reduces when the air temperature falls below -30℃. The rime days are 41% of the rime days occurred in winter when the maximum relative humidity is less than 80%. Low temperatures, high humilities, and low wind speeds, as well as the small diameter of the Haloxylon ammodendron crown branches and needle-like leaves are the important reasons for rime formation and condensation on desert shrubs over the Gurbantunggut Desert.