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但紫色土分布区的水土流失问题较为严重，对长江上游生态环境建设和安全都有不利影响。本文论述了紫色土的侵蚀和泥沙形成流失的特点。
The problem of severe soil and water loss in the purple soil area is adverse to eco-environment construction and safety in upper reaches of the Yangtze River.
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