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jian chi sheng tai you xian bao hu de yuan ze
Pages: 1
Year: Issue:  3
Journal: Forestry of Gansu

Abstract: 我省是全国唯一包含东部季风区、西北干旱区、青藏高原区三大自然区的省份.干旱少雨,地貌复杂,山地和高原占国土面积的70%以上.全省年均降水量约400毫米,其中占全省面积一半以上的河西地区年均降水量不足200毫米,严重影响营造林成效.随着林业建设的逐步深入,林业生态治理项目不断向远山、深山、沙区推进,自然条件越来越差,造林难度越来越大,生态恢复周期越来越长,治理成本越来越高,森林覆盖率每提高一个百分点都要付出艰辛的努力.
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