【摘要】 我国荒漠化土地面积占国土总面积的 2 7.3 % ,占西北地区国土总面积的三分之一 ,整个地区以沙漠、戈壁为主。地域总体特点是 :高、寒、旱、瘠 ,干旱缺水是制约西部生态工程建设的主要因素。因此在西北干旱、半干旱区严酷特殊的自然条件下进行林业生态环境建设 ,就必须加强林木遗传育种、种质资源选择、种植模式的研究更多还原

【Abstract】 The desertified area cover 27.3% of the national territory,accounting for one-third of the northwest area,most of areas aredesert and gobi.The general charaeter of the areais high altitude,cold,drought and poor The major hindering elements of western ecologypyoject construction are drought and water shortage.This paper makesuggestions on tree hereditary breeding,selecting of seed qualityresources and planting models undee the conditions of the harshment andspeciality in arid and semi-arid area of western China.更多还原