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河西各地在固沙造林上,采用的工程固沙措施主要是设置粘土沙障或柴草沙障,此外还有土埋沙丘、砾石压沙等。上述固沙措施,由于劳动强度大,花工多或材料缺,工本高,都有其局限性。为了进一步探索新的工程固沙措施,1978年以来,我们采用沥清毡作沙障材料,在站西缘和宋和大队林场50余亩流动沙丘上,连续设置了1万多米沙障,进行固沙造林试验,初获成效。现就沥清毡沙障固沙原理,设置技术,经济效益,固沙效应等问题,提出一些见解,供讨论。
All over the Hexi Corridor afforestation, the use of engineering sand-fixing measures are mainly to set the clay sand barrier or firewood sand barrier, in addition to buried sand dunes, gravel sand and so on. The sand-fixing measures mentioned above have their limitations because of their labor intensity, large number of workers, lack of materials and high labor costs. In order to further explore the new sand-fixing measures for construction, we used asphalt blanket as sand barrier material since 1978. On the west side of the station and over 50 acres of mobile sand dunes in the Songhe and Dabai Forest, we successively set up a sand barrier of over 10,000 meters to carry out Sanding afforestation experiment, initially achieved results. At the same time, some opinions are put forward for discussion on the principle of sandblasting sandblasting of asphalt felt, setting technology, economic benefits and sand-fixing effect.