不同退耕还林模式对地表径流及土壤物理性状影响的研究

Influences of different patterns in converting cropland to forestland project on surface run-off and soil physico-chemical character

通过对辽东山区退耕还林综合效益监测场不同恢复模式3 a连续的定点观测,结果表明:坡耕地在退耕后具有较强的植被自然恢复能力,生态防护功能增强,人工辅助措施能加速植被恢复速度;退耕后对水土流失的控制作用显著,年均减少泥土流失量达103.91 g·m^(-2)以上,总体防护效果呈现为自然区>乔灌区>乔木区>对照区;退耕还林还草一定程度地改善了土壤的物理性状,土壤的渗透性能增强,提高了坡地的水土保持能力。

Through serial investigation of three yeats on different revegetation patterns in the supervising site of Liaodong mountainous area, the result indicates that the sloping cropland has a strong ability for natural regeneration after taking back from agriculture, it has enhanced ecological function and accelerated revegetafion, by artificial measures;The foresfland converted from cropland has a remarkable control action to soil erosion, the yearly average reduction of soil outflow reached above 103.91 g· m^-2, the overall protection effect presents for the natural area 〉 tree/shrub are 〉 tree area 〉 check area. Therefore, to some extent, converting cropland to forestland can improve soil physico - chemical character, increase soil permeability and soil and water conservation effect of the slop.