论文部分内容阅读
东北黑土地,是我国土壤最肥沃、最适于耕种的一片土地。这片面积约为100万平方千米,范围包括黑龙江、吉林、辽宁和内蒙古一部分的黑土带,为全国提供14%的粮食、40%的大豆和50%的玉米。但是,现在曾经被人们形容为“插根筷子都会发芽”的黑土地,却正在发生着令人担忧的流失现象。据统计,目前东北黑土区水土流失总面积为27.59万平方千米,占黑土地总面积的26.79%。同时,黑土层从最初的近100厘米厚到现在大都只剩20～30厘米,平均每年以0.7～1.0厘米的速度变薄。
Northeast black soil, is China’s most fertile soil, the most suitable for cultivation of a piece of land. Covering an area of about 1 million square kilometers, it covers a part of the black soil zone in Heilongjiang, Jilin, Liaoning and Inner Mongolia, providing 14% of the country’s food, 40% of the soybean and 50% of the corn. However, what has now been described as “black soil where rooted chopsticks can germinate” is undergoing alarming losses. According to statistics, the total area of soil erosion in the black soil areas in Northeast China is 275,900 square kilometers, accounting for 26.79% of the total land area of black soil. At the same time, the black soil from the initial nearly 100 cm thick to the present mostly only 20 to 30 cm, an average of 0.7 to 1.0 cm per year thinning.