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黄土是我国有特色的第四纪沉积物。黄土在中国北方的分布,大致为北纬30—40°的范围。其中以黄河中游地区分布最为广泛,构成了切割程度不一的黄土高原。黄土在黄河中游地区的分布面积约为275,600平方公里,占该区总面积的40%以上。黄土高原是一个遭受较强烈侵蚀的地区,加之黄土本身的性质比较疏松,具大孔隙和垂直节理发育等组织结构特征,使这里的水土流失比较严重。解决西北黄土高原水土流失问题,对实现我国农业现代化具有重大意义。
Loess is China’s unique Quaternary sediments. Loess distribution in northern China, roughly latitude 30-40 ° range. Among them, the distribution in the middle reaches of the Yellow River is the most extensive, forming a loess plateau with different degrees of cutting. Loess in the middle reaches of the Yellow River area of about 275,600 square kilometers, accounting for more than 40% of the total area. The Loess Plateau is a region subjected to more intense erosion. In addition, the loess itself is loose in nature with structural features such as macropores and vertical joint development, which make the soil and water loss more serious here. Solving the problems of soil and water loss in the Northwest Loess Plateau is of great significance to the realization of China’s agricultural modernization.