Quantifying potential of sediment yield from mountainous watersheds by terrestrial cosmogenic nuclides

山坡和山地流域的剥蚀率是由宇宙射线照射地球陆地表面产生的地球宇宙核素决定的。利用加速器质谱法对流域出水口土壤下腐腐岩和河流沉积物中的核素进行分析，计算出流域坡地产土速率和流域空间平均剥蚀速率分别为10 ~ 1000 g/m2/yr和100 ~ 10000 g/m2/yr。在高起伏陡峭的山地地形中，剥蚀速率超过土壤生成速率，这意味着基岩滑坡对剥蚀和景观演变的重要贡献。

Denudation rates of hillslopes and mountainous watershed were determined by terrestrial cosmogenic nuclides produced by cosmic-ray irradiation onto the Earth's land surfaces. Soil production rates on hillslopes and spatially-averaged denudation rates of watersheds were calculated to 10-1000 g/m2/yr and 100-10000 g/m2/yr, by accelerator mass spectrometry of nuclides in saprolite beneath soil layer and fluvial sediments collected at outlet of the watersheds, respectively. In high-relief steep mountainous terrains, denudation rates exceed soil production rates, implying a significant contribution of bedrock landsliding to denudation and hence landscape evolution.