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首页> 外文期刊>Journal of geographical sciences >The effects of land use on runoff and soil nutrient losses in a gully catchment of the hilly areas: implications for erosion control
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The effects of land use on runoff and soil nutrient losses in a gully catchment of the hilly areas: implications for erosion control

机译：丘陵沟壑区土地利用对径流和土壤养分流失的影响：对侵蚀控制的影响

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摘要

Serious soil erosion is one of the major issues threatening sustainable land use in semiarid areas, especially in the Loess Plateau of China. Understanding the effects of land use on soil and water loss is important for sustainable land use strategy. Two sub-catchments: catchment A (CA) and catchment B (CB) with distinct land uses were selected to measure soil moisture, runoff and soil nutrient loss in Da Nangou catchment of the Loess Plateau of China. The effects of land use patterns on runoff and nutrient losses were analyzed based on soil moisture pattern by kriging and soil nutrients using multiple regression model. The results indicated that there were significant differences in runoff yield and soil nutrient losses between the two sub-catchments. With similar land uses, the CA produced an average sediment yield of 49 kg ha~(-1) and 22.27 kg ha~(-1) during two storm events. Meanwhile, there was almost no runoff in the CB with dissimilar land uses during the same events. Buffer zones should be established to re-absorb runoff and to trap sediments in catchment with similar land use structure such as the CA. Moreover, land use management strategy aiming to increase the infiltration threshold of hydrological response units could decrease the frequency of runoff occurrence on a slope and catchment scale.
机译：严重的水土流失是威胁半干旱地区尤其是中国黄土高原土地可持续利用的主要问题之一。了解土地利用对水土流失的影响对于可持续土地利用战略很重要。在中国黄土高原大南沟流域，分别选择了两个具有土地用途的流域A（CA）和B（CB）来测量土壤水分，径流和土壤养分流失。利用克里格法和土壤养分，采用多元回归模型，基于土壤水分模式，分析了土地利用方式对径流和养分流失的影响。结果表明，两个子流域的径流产量和土壤养分流失存在显着差异。在相似的土地利用下，CA在两次暴风雨期间平均产生了49 kg ha〜（-1）和22.27 kg ha〜（-1）的沉积物。同时，在同一事件中，CB中几乎没有土地用途不同的径流。应建立缓冲区，以重新吸收径流并用类似土地利用结构（例如CA）将流域中的沉积物截留。此外，旨在提高水文响应单元入渗阈值的土地利用管理策略可以在坡度和集水规模上减少径流发生的频率。

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