我省中部干旱地区,年雨量在200～400毫米之间,水面蒸发量却在1,500毫米以上,相对湿度52～70%,年平均气温6.5℃。这种干旱缺雨,无霜期短的自然条件,造林比较不易成活。特别是在水土流失的干山干坡上造林,更需请求造林技术。为此,我们曾 In the central arid region of our province, the annual rainfall is between 200 and 400 mm. The evaporation on the water surface is above 1,500 mm and the relative humidity is 52 to 70%. The annual average temperature is 6.5 ° C. This drought, rainy, frost-free period of the natural conditions, afforestation is relatively easy to survive. Especially in the dry slope of soil and water erosion afforestation, but also need afforestation technology. To this end, we have