论文部分内容阅读
在国家决定建设重点转移到大西北,把黄土高原水土保持专项治理规划列为国家重点项目之际,很有必要探索这些地区水土流失日趋严重的根源。本文试图说明控制人口素质,提高人口素质,恢复植被,是治理水土流失的根本。一、人口骤增,毁坏林草为了论证西北黄土高原历史人口变迁,造成生态环境的恶化,先追溯一下黄土高原在古代的概貌。据考证,历史上黄土高原的陇东、陕北、晋西北,都是水草茂盛的大草原,绝大部分山岳、
It is necessary to explore the root causes of the increasingly serious soil and water loss in these areas when the state decides to shift its construction to the northwest and focus on the special project of soil and water conservation in the Loess Plateau. This article attempts to explain the control of population quality, improve population quality, restore vegetation, is the root of soil and water erosion control. First, the surge in population, destruction of forest and grass In order to demonstrate the historical population changes in the Northwest Loess Plateau, resulting in deterioration of the ecological environment, first look back on the Loess Plateau in the ancient profile. According to research, the history of the Loess Plateau Longdong, northern Shaanxi, northwest Shanxi, are lush prairie, most of the mountains,