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戈壁在我国西北地区分布比较广泛,总面积大约有45.8万平方公里。这类地区水土奇缺,植树造林成活率低,或活而不长,长而不旺,很难成林。个别地区采用“人工客土”造林,确有较好的效果,然而费用高,使得这一经验至今不能很好推广。鉴于此种情况,自1972年以来,我们在兰新线玉门戈壁风沙流地区,对“开沟积沙,自然客土”造林的方法进行了试验,收到了较好的效果。一试验地区自然条件试验地区位于甘肃河西走廊祁连山北麓,洪积一冲积砾石戈壁的前缘地带。戈壁由第四纪砾石层组成,地面基本平坦,砾石磨圆度较好。其上发育有普通棕漠土或石膏棕漠土。pH值为8.0—8.6。土壤母质贫瘠,有机质含量多在0.18—0.4%,个别地段在0.1%以下,机械组成如表1。试验地区的气候据玉门镇气象站1954—1975年的资料:年平均气温为6.9℃,
Gobi in Northwest China is more widely distributed, with a total area of about 458,000 square kilometers. Such areas lack water and soil, afforestation survival rate is low, or live longer, long and not flourishing, it is difficult to become a forest. In some areas, “artificial soil” afforestation does have good results. However, the high cost makes this experience so far not well publicized. In view of this situation, since 1972, we experimented with the method of “ditching, sediment-making and natural-receiving” afforestation in the gob sand flow area of Yumen-Gansu-Lanmen line and received good results. A test area natural conditions test area is located in Gansu Hexi Corridor Qilian Mountains, the alluvial-alluvial gravel Gobi, the leading edge. Gobi is composed of Quaternary gravel, the ground is basically flat, gravel roundness is better. On the development of ordinary brown desert or gypsum brown desert soil. The pH is 8.0-8.6. Soil parent material barren, organic matter content mostly in 0.18-0.4%, individual lot below 0.1%, the mechanical composition shown in Table 1. The climate in the test area According to the data of Yumen Town Weather Station from 1954 to 1975: the annual average temperature is 6.9 ℃,