【摘要】 通过在金沙江元谋干热河谷不同坡度径流小区内人工构建优势乡土草群落,研究了自然降雨对不同坡度径流小区产流量和泥沙量的影响。结果表明:不同径流小区产流量和土壤侵蚀模数与降雨量呈正相关,与植被盖度呈负相关;种植处理与对照CK差异显著,且小区坡度越大越显著;降雨利用率随坡度增加而减少,而且乡土草植被群落盖度越大小区降雨利用率越高。通过构建乡土草群落能有效地降低水土流失,增加降雨利用率,且随着坡度增大,水土流失治理效果越明显。更多还原

【Abstract】 Dominant native grasses were assembled for constructing communities in different slope runoff monitoring sites,and their effects and efficiencies on water and soil loss were examined under Yuanmou dry-hot valley conditions.The observation results from 2013 to 2015showed that runoff generations and soil erosion modulus were positively correlated with rainfall(p<0.05);soil and water losses were significantly different between constructed native grasses community sites and CK sites,runoff generations and soil erosion modulus increased with the rise of slope gradients across all communities and CK sites;in contract,water utilization efficiencies of constructed native grass communities reduced with the increase of site slope gradients,and rose with increase of community coverage.The above results suggested that planted native grass communities significantly reduced water and soil loss and improved the reutilization of rainfall,and the reduction of soil and water loss was more obvious with the increase of slope gradient,which reveled that it could be more efficient when those communities were built in steep sloping lands in hilly.更多还原