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我国西北、华北、东北地区有相当数量的沙丘、岗地。这些地方气侯干旱,降雨量少。尤其是春秋两季,风沙大,旱情严重。按过去“不开沟、植树造林”的方法,成活率只有20—30%,大部分苗木死于干旱和风蚀。对此,当地林业工人创出了“开深沟、植全苗”的造林方法,成活率达70%以上。这种方法是:在沙丘上开出一条深35—40厘米的防风保墒沟,沟口宽一米,沟底宽为30厘米左右。再在沟底另开深25—28厘米、宽15—18厘米的栽植沟,然后人工投苗,覆
China’s northwestern, northern and northeastern regions have a considerable number of sand dunes and posts. The climate is arid and the rainfall is low in these places. Especially in spring and autumn, the wind and sand are big and the drought is serious. According to the past “no ditching, afforestation” approach, the survival rate of only 20-30%, most of the nursery stock died of drought and wind erosion. In response, local forestry workers created a “open deep ditch, planting seedlings,” afforestation methods, the survival rate of 70% or more. This method is: out in the sand dune 35-40 cm deep wind furrow ditch, Mizoguchi one meter wide, ditch bottom width of about 30 cm. And then ditch another open deep 25-28 cm, 15-18 cm wide planting trenches, and then artificial seedlings, cover