东北3省人类活动与水土流失关系的演进

受人类对土地过度垦殖及不合理耕作利用的影响,水土流失正在成为制约我国东北地区耕地可持续利用和粮食生产的主要因素。在对历史资料甄别与整理的基础上,分析近代以来东北3省区人口、土地利用变化及其与水土流失关系的演变。结果表明:到20世纪中期,东北地区人口压力达到60~70人/km2,伴随着生活方式的转变,机械化技术的应用,林草湿地被垦殖,森林覆盖率降到30%,垦殖率达30%,使区域性水土流失问题日益严重。

By human excessive reclamation of land and unreasonable farming,regional soil and water loss is becoming a constraint factor in sustainable use of arable land and food production in Northeast China.In this study,based on discrimination and select of historical data,the relationship between population,landuse changes and soil and water loss in Northeast China from 1840 up to now is analyzed.The results show that: When the population density up to 60—70 people per square kilometer,along with lifestyle changes...