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坡耕地作为四川省最为主要的土地资源,也是造成水土流失的最主要来源。坡改梯是长江流域坡耕地治理最基本的水土保持措施,截至2010年,四川省坡改梯面积为288.35 km2,其中25°以上的坡耕地从166 km2减少至329.93 hm2。坡改梯前后水土保持效益对比分析表明,四川省坡地改成梯田后,土壤侵蚀量削减程度在70%以上,从治理验收结果看,治理达到预期目标。四川省坡耕地面积较大,其主要治理措施坡改梯面积也相应较大,坡改梯措施产生了良好的减蚀效益,该特征在不同区域有所差别,但具有相同趋势。
As the most important land resource in Sichuan Province, sloping farmland is the most important source of water and soil loss. As the most basic soil and water conservation measures for sloping farmland management in the Yangtze River Basin, as of 2010, the area of sloping farmland in Sichuan Province is 288.35 km2, of which the sloping farmland above 25 ° is reduced from 166 km2 to 329.93 hm2. The comparative analysis of benefits of soil and water conservation before and after slope alteration shows that the reduction of soil erosion is more than 70% after the slope is changed into terrace in Sichuan Province. From the results of governance acceptance, the government achieves the expected goal. Slope cultivated land in Sichuan Province is larger, and its main control measures are larger slope slope area, slope improvement measures have a good effect of reducing erosion, the characteristics in different regions are different, but have the same trend.