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选取我国南方红壤丘陵区5种等高草篱种植模式,结合径流小区法和稀土元素示踪技术,开展不同草篱控制坡地水土流失、减少地表径流的效应研究,分析等高草篱对坡面侵蚀空间分布的影响。结果发现,径流小区土壤流失量显著受降雨量影响,不同草篱种植模式下,各径流小区的平均土壤流失量和地表径流量较对照组(裸坡)均显著降低(P<0.05),其中麦冬双行草篱处理平均土壤流失量和地表径流量最小,分别为4 047 g和1 554 L,对照组(裸坡)最大,分别为19 793 g和2 403 L;麦冬双行草篱在控制坡面土壤流失和径流方面效果最佳;通过平均土壤流失量和平均径流量的二次线性拟合模型发现,随着地表径流量的变化,不同处理下土壤流失量的边际值存在差异;坡面中、下部是侵蚀泥沙的主要溯源地,产生了接近总流失量85%的泥沙;草篱改变了降雨过程中坡面内部土壤因沉积作用导致的再分布,但对整个坡面土壤侵蚀的空间分布规律无明显影响。
Five grassland hedgerows in red soil hilly region of southern China were selected to study the effects of different grass hedgerows on slope erosion control and land runoff reduction combined with runoff plot and REE tracing techniques. Impact of erosion on spatial distribution. The results showed that the amount of soil loss in runoff plot was significantly affected by rainfall. The average soil loss and surface runoff in each runoff plot were significantly lower than those in control group (P <0.05) The average amount of soil loss and surface runoff of the two-row hedgerows in winter and winter were the lowest, which were 4 047 g and 1 554 L respectively, with the largest values of 19 793 g and 2 403 L. In the control The results of quadratic linear fitting model of average soil loss and average runoff show that the marginal values of soil loss under different treatments are different with the variation of surface runoff; The middle and lower parts of the surface are the main source of sediment erosion, resulting in nearly 85% of the total amount of sediment; straw hedgerows change within the slope of the soil due to sedimentation caused by redistribution, but the slope of the soil The spatial distribution of erosion had no significant effect.