中国林业大学校长朱金兆教授在“绿色与环保”论坛的专题研讨会上指出 ,按照科学的配置 ,黄土高原地区的森林覆盖率只要达到 30 %～ 35 % ,就能明显减少黄河流域的水土流失。朱教授在谈及治理黄河流域水土流失工作的成效时说 ,三北防护林工程目前进入了第 4期建设 ,虽然还存在 Professor Zhu Jinzhao, President of China Forestry University, pointed out at the symposium on “Green and Environmental Protection” that according to the scientific configuration, as long as the forest coverage in the Loess Plateau reaches 30% -35%, the soil and water loss in the Yellow River Basin will be significantly reduced. Commenting on the effectiveness of harnessing soil and water loss in the Yellow River Basin, Professor Zhu said that the Three North Shelterbelt Project has now entered its fourth phase of construction although it still exists