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Soil bulk density affects soil erosion process and the sediment delivery (S) during the run is associated with rill head-cut advance. 土壤容重影響坡麪侵蝕的發(fā)生和發(fā)展，而坡麪侵蝕産沙過程與細(xì)溝發(fā)育過程相對(duì)應(yīng)。