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荒漠地区一般降水量不足150毫米,蒸发量远远大于降水量,干燥度在4以上,水分是干旱荒漠地区开展造林的限制因素,多年来从事灌溉造林,取得了一定的成绩。但由于荒漠地区地表水、地下水资源非常有限,要长期大面积进行灌溉造林是困难的,而在目前的技术条件,通过其它方式改变水分条件的制约也是有困难的。因此,近年来许多林学家提出在荒漠地区实行“旱作林业”,即非灌溉造林,在非灌溉的条件下,研究对苗木成活和生长有显著
In the desert area, the precipitation is less than 150 mm, the evaporation is far greater than the precipitation, and the dryness is above 4. Moisture is the limiting factor for afforestation in arid desert areas. For some years irrigation afforestation has achieved certain achievements. However, due to the very limited surface and groundwater resources in desert areas, it is difficult to sustain afforestation in large areas in the long term. However, under the current technical conditions, it is still difficult to change the water conditions by other means. Therefore, in recent years, many forest scientists put forward the implementation of “dry farming forestry” in desert areas, that is, non-irrigated afforestation. Under non-irrigation conditions, the research shows significant effects on survival and growth of nursery stock