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为解决南方红壤丘陵区裸坡面水土流失问题,该文采用人工模拟降雨(雨强30—150mm/h)结合试验土槽等方法(坡长分别为1、2、3、4、5m,坡度20°),研究了不同雨强下坡长对红壤侵蚀的影响,并初步探讨了侵蚀增强的临界雨强和设置水土保持措施的合理坡长,结果表明,产沙量随坡长的延长呈增大趋势,二者的关系可用幂函数(R2>0.80)表示,雨强越大,产沙量增速越快,增量越大.坡长延长相同长度时,产沙量不呈比例增加,初步建议在南方红壤丘陵区裸坡面可每隔4—6m设置水土保持措施,有效缓解坡面水土流失.坡面侵蚀产沙量随着雨强的增大而增加,坡长越长,产沙量随雨强增加速度越快,二者呈幂函数关系(R2=0.99),60mm/h左右是红壤丘陵区侵蚀增强的临界雨强;雨强、坡长与产沙量均呈正相关关系,雨强对裸坡面侵蚀产沙量的影响较坡长大.该研究为南方红壤丘陵区裸坡面水土流失治理提供一定的理论依据.
In order to solve the problem of soil erosion on bare slope in the hilly red soil region of Southern China, artificial rainfall (rainfall intensity 30-150mm / h) combined with soil test (soil length of 1,2,3,4,5m, gradient 20 °). The effects of downhill length under different rainfall intensity on red soil erosion were studied, and the critical rainfall intensity with enhanced erosion and the reasonable slope length of soil and water conservation measures were discussed. The results showed that the sediment yield increased with the extension of slope length (R2> 0.80), the greater the rainfall intensity, the faster the increase of sediment yield, the greater the increment.The slope length does not increase proportionally when the same length is extended , It is suggested that water and soil conservation measures can be set every 4-6 m on the bare slope of hilly red soil region in the southern part of China so as to effectively alleviate the water and soil loss on slope.The slope erosion and sediment yield increase with the increase of rainfall intensity, The rate of sediment yield increased with rainfall intensity (R2 = 0.99), and the critical rainfall intensity was about 60 mm / h. The correlation between rainfall intensity, slope length and sediment yield was positive Relationship and rain intensity on the bare slope erosion and sediment than the slope grows.The study for the red soil hilly slope in southern slope soil erosion Li provide a theoretical basis.