赤峰沙漠主要特征及成因

THE MAIN CHARACTER AND THE GENESIS OF THE CHIFENG DESERT, CHIFENG DISTRICT

内蒙赤峰面积约8.4万平方公里,大兴安岭由东北至西南斜贯全区,最高点大光顶子海拔2067米,最低点西拉沐沦河谷海拔300米,一般800～1000米,由西北-北-东南-南地势逐级降低,山区面积占全区的46.54％,丘陵、山间谷地和坡洪积扇占23.86％,余者为平原区。区内主要河流有老哈河及西拉沐沦河,较大湖泊有达来诺尔及岗更诺尔。

The desert covers about one-eighth of the territory Chifeng district, inner Mongolie.lt appears in strips in valleys or at the junctions of valleys when ite isunder the wind and in the fault plains (fault basins). Among the deserts the consolidated dunes make 6.94% of the total, the half-consolidated 87.5% and the moving ones 5.56%.The height of the dynes arc generally below W metres, but some may seach thirty to forty metres. The proportion of regetation coveing the dunes is 40--60%.The wind scoured hollow entirely log parallel to the north-west or west side of the dunes. On account of the reckless cutting the vegetation has been badly destroyed.Exposed to the strony north-west wind, sands are blown up and fall down to the gronnd heaping up the present desert. This process now is still going on. The dunes are continuously moving eastword with the maximum -aversage speed of 25 metres a year.