大渡河上游水土流失特征

FEATURES OF SOIL AND WATER EROSION IN UPPER COURSE OF DAI DUO RIVER

大渡河上游水土流失及气候、土壤类型的相关性明显。新积土类土壤受河水冲蚀和风的吹蚀;褐土类土壤片蚀、沟蚀强烈,滑坡危害严重,崩塌常发生,泥石流破坏极大;棕壤、暗棕壤带,伐木区常是暴发泥石流的发源地;亚高山、高山草甸土带易受融雪水冲刷,并遭强劲寒风吹蚀。

There is a close relatoia between the soil and water erosion and climate and soil types. The fluvo-aquie soils have drifting and winding erosion. Sheet erosion, strong gully erosion, colluvial erosion, serious slip and block glacier often happen to thc cinnamon soils. The brown soils, dark brown soils and Possibly felling areas are often the origins of block glacier, possibly alpine meadow soil is easily suffered from erosion and strong cold winding erosion.