【摘要】 嘉陵江中下游水土流失严重，是全国水土保持重点防治区，本文通过对典型流域李子溪泥沙流失规律及长治工程效益分析后得出：近十年，由于对生态环境的治理和保护，该流域水土流失呈下降趋势，多年平均输沙量１９８５～１９９４年较１９６５～１９８４年减少了５８．３％。因此，若将该流域治理水土流失的经验和措施，推广到嘉陵江中下游其它地区，该区严重的水土流失定将得到明显改善。更多还原

【Abstract】 The middle and down reach of Jialingjiang river, where soil losses badly, is a major region of water and soil conservation in whole country. In the paper, a conclusion is obtained by analyzing the law of soil-loss and the effect of control engineering in Lizixi basin, which is a typical basin of the reach. Because of taking control and protect measurement to the ecological environment soil-loss in the basin shows a tendency to decrease in a recent decade. Comparing with long-term average sediment discharge in years from 1965 to 1984, sediment discharge in years from 1985 to 1994 reduced 58.3%. Therefore, if the experience and measurement of controlling soil-loss of the basin are spread to other areas of the reach, the condition of serious soil-loss in middle and down reach of Jialingjiang river will be distinctively improved.更多还原