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利用稀土示踪技术和径流小区法在人工降雨条件下研究南方地区坡耕地水土流失特征.研究发现:坡面侵蚀量与降雨强度有关;坡面侵蚀泥沙主要来自坡面的中部和下部,其中坡面上部只占总侵蚀量的10%左右,而中坡和下坡占总侵蚀量的90%左右,下坡侵蚀量最大,占总侵蚀量50%左右;降雨强度、土壤团聚结构、渗透率和土壤含水量导致第一次人工降雨的侵蚀量、侵蚀泥沙中各稀土元素的含量最大;第二次人工降雨的侵蚀量比第一次人工降雨的小,但比后面3次人工降雨的侵蚀量大.同时探讨了南方地区侵蚀研究的重要性和特点、人工降雨所测结果的应用,以及侵蚀泥沙来自于中部和下部的机理.
The characteristics of soil and water loss on sloping farmland in southern China were studied by means of Rare Earth Tracing technique and runoff plot method under the condition of artificial rainfall. It was found that the erosion amount on slope was related to the rainfall intensity. The erosion sediment mainly came from the middle and lower part of the slope, The upper part of the slope only accounts for about 10% of the total erosion, while the middle slope and the down slope account for about 90% of the total erosion and the largest erosion, which accounts for about 50% of the total erosion. The rainfall intensity, soil aggregation structure and infiltration The rate of soil erosion and soil water content led to the first artificial rainfall erosion, and the content of each rare earth element in erosion sediment was the largest. The second artificial rainfall eroded less than the first artificial rainfall, but more than the third artificial rainfall The importance and characteristics of the erosion research in the South China, the application of the results measured by the artificial rainfall, and the mechanism of sediment erosion from the middle and lower parts of the basin are discussed.