作为世界上仅有的三大黑土带之一的我国东北黑土地,垦殖初期土质肥沃,黑土层厚度在70～80厘米以上,有的厚达1米,而且植被丰厚,自然生态条件优越,是全国著名的商品粮基地。但是,由于片面追求发展速度和粮食产量,盲目的、掠夺式的毁林毁草开荒,使得地表植被遭到严重破坏,80%以上坡耕地黑土层以每年流失表 As the only one of the three major black soil zones in the world, the black soil in Northeast China is fertile in the early stage of cultivation. The thickness of black soil layer is above 70 to 80 centimeters, and some are 1 meter thick. With rich vegetation and excellent natural and ecological conditions, National famous commodity grain base. However, due to the unilateral pursuit of the pace of development and the output of grain, the blind and predatory deforestation has caused serious damage to the vegetation on the surface and more than 80% of the black soil on sloping fields has been lost annually