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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Response of sediment discharge to soil erosion control in the middle reaches of the Yellow River
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Response of sediment discharge to soil erosion control in the middle reaches of the Yellow River

机译：黄河中游土壤侵蚀控制沉积物排放的反应

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摘要

Under the background of large-scale, high-intensity, comprehensive soil erosion control, the sediment discharge of the Yellow River has undergone profound changes. The quantitative evaluation of the influences of soil and water conservation on sediment discharge is not only an inevitable requirement for the objective assessment of the ecological benefits of soil and water conservation projects, but it is also a prerequisite for gaining a scientific understanding of the causes of the drastic changes in the sediment discharge of the Yellow River. Taking the trunk stream in the Toudaoguai-Tongguan section of the middle reaches of the Yellow River and its 24 primary tributaries as the research objects, the Mann-Kendall test and the double mass curve were used to determine the spatial-temporal changes in the sediment discharge over the past 60 years. The results show the following. 1) The average annual sediment discharge in the Toudaoguai-Tongguan section decreased by 81.1% (P < 0.001) over the past 60 years, with a sudden decrease in 2000. 2) From 1956 to 2000, the Toudaoguai-Wubao section, the Wubao-Longmen section, and the Longmen-Tongguan section contributed 34.76%, 30.60%, and 34.64%, respectively, to the sediment discharge measured at Tongguan station. After 2000, the contribution rates were 11.17%, 38.93%, and 49.9%, respectively. 3) Compared with 1956-2000, the average annual sediment discharge of the primary tributaries during 2001-2016 decreased by an average of 85.61%. Marginal benefit analysis indicates that, once the degree of soil erosion control in the study area reached the critical value of 32%, the marginal sediment reduction benefits of the soil and water conservation measures approached 0. Once the degree of soil erosion control exceeded 50%, the sediment discharge in the river basin decreased to a low level. These research results provide a reference for future directions and priorities in soil erosion control planning and implementation on the Loess Plateau.
机译：在大规模、高强度、综合治理水土流失的背景下，黄河输沙量发生了深刻的变化。定量评价水土保持对输沙量的影响，不仅是客观评价水土保持工程生态效益的必然要求，也是科学认识黄河输沙量急剧变化原因的前提。以黄河中游头道拐-潼关段干流及其24条一级支流为研究对象，采用Mann-Kendall检验和双质量曲线确定了近60年来黄河输沙量的时空变化。结果如下。1） 在过去60年中，头道拐-潼关断面的年平均输沙量下降了81.1%（P<0.001），2000年突然下降。2） 1956年至2000年，头道拐-五堡段、五堡-龙门段和龙门-潼关段对潼关站测得的输沙量的贡献率分别为34.76%、30.60%和34.64%。2000年后，贡献率分别为11.17%、38.93%和49.9%。3） 与1956-2000年相比，2001-2016年一级支流年均输沙量平均下降85.61%。边际效益分析表明，一旦研究区的土壤侵蚀控制程度达到32%的临界值，水土保持措施的边际减沙效益接近0。一旦土壤侵蚀控制程度超过50%，流域的输沙量将降至较低水平。这些研究结果为黄土高原水土流失防治规划和实施的未来方向和重点提供了参考。

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