论文部分内容阅读
水失流失治理的迫切性水是生命之源,水对一切生命活动包括物种生存、农业生产具有十分重要的作用,水资源枯竭就意味着生命的灭绝。土是万物之本,“土壤是世代相传的,人类所不能出让的生存条件和再生条件”。由上可知,水土资源是农业持续发展的基础条件。水土流失造成大量肥沃土壤的流失,造成土地退化,水资源亏缺,动摇了农业生产的基本条件,导致更为严重的生态问题,对人类的生存与发展构成了威胁,成为世界经济发展的隐患。我国是世界上水土流失最为严重的国家之一,水土流失面积达367万 km~2,占国土面积的38.2%,每年流失土壤总量达50亿 t。水土流失所产生的大量泥沙在大江大河的中下游淤积,由此所产生的洪水危害,已成为中华民族的心腹大患。国土与环境是一个国家的立足之本,也是生活在地
The Urgency of Water Loss Control Water is the source of life. Water plays a very important role in all life activities, including species survival and agricultural production. The depletion of water resources means the extinction of life. Soil is the essence of everything, “” soil is handed down from generation to generation, human beings can not be transferred to living conditions and regeneration conditions. " It can be seen from the above that soil and water resources are the basic conditions for the sustainable development of agriculture. Soil and water loss caused a lot of loss of fertile soil, resulting in land degradation and water shortage, shaken the basic conditions of agricultural production, led to more serious ecological problems, posed a threat to the survival and development of mankind and became a hidden danger to the world economic development . China is one of the countries with the most serious soil erosion in the world. The area of water and soil loss reaches 3.67 million km2, accounting for 38.2% of the total land area. The total soil loss per year reaches 5 billion tons. The large amount of sediment produced by soil erosion and sedimentation in the middle and lower reaches of the major rivers silt, resulting in flood damage, has become a big trouble for the Chinese nation. Land and environment are the foundation of a country and live in the same place