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一、水土流失问题已引起全世界的关注水土流失已成为全球性的公害,严重威胁着人类的生存与发展.据联合国有关部门的研究资料,每年全世界由于土壤侵蚀要损失耕地500～700万公顷,本世纪末可能上升到1000万公顷,而世界人口到2000年将从现在的50亿增加到60亿左右.根据对人口增长的推算,粮食需求量亦将成倍增长.这样,一方面耕地土壤在严重损失,一方面人口对粮食需求量急剧增加,形成十分棘手又必须解决的矛盾.
Soil and water loss has aroused the world’s attention Soil and water loss has become a global public hazard and a serious threat to human survival and development.According to the relevant UN departments research data, the world each year due to soil erosion to lose 5 million to 7 million Hectare may rise to 10 million hectares by the end of this century while the world population will increase from the current 5 billion to 6 billion by 2000. According to projections of population growth, the demand for food will also double up, so on the one hand, On the serious loss of soil, on the one hand the demand for food by the population has risen sharply, forming a very difficult and contradictory problem.