【摘要】 <正>实验资料 水平梯田是水土保持工作中治坡的重要措施之一。南宋范成大的《骖鸾录》中有“……至仰山腹乔松之磴甚危,岭阪上皆禾田,层层而上至顶,名梯田。” 可见梯田之盛行距今至少已有数百年。长期以来(特别是解放以后),我国水土保持科研部门,在水平梯田防止土壤侵蚀作用方面,作了许多观测试验,累积了丰富资料。黄河流域不同地点,不同年份,水平梯田年平均防蚀效益的观测资料如下表(摘自《中国水土保持》1983年第2期37页)。更多还原

【Abstract】 Based on theoretical analysis, formula for maximum power of runoff from slope due to rain storm is derived. The amount of energy which is not liable to cause soil erosion in case of rainfall exceeding the capacity of infiltration into the soil in horizontal field may also be calculated. The authors are of the opinion that building of horizontal terraced fields to transform the cropland on slopes by modifying the angle of inclination, focal ones to be dealt with first,work at key positions should go hand in handTwo such data bases have already been set up in the Qingshui River Basin reducing the coefficient of runoff and shortening of the slopes are the three important measures to curb soil erosion.Through improvemeut of facilities and management, it is considered theoretically possible that the effect of horizontal terraced fields in checking soil erosion may be raised to 95-100%.更多还原