退耕还林对延河支流西川河流域水土保持效益影响

Effect of returning farmland to forests to benifit of soil and water conservation in Xichuanhe River Basin

延河上游地区水土流失极为严重,是延河流域泥沙的主要来源区。本文依据延河支流西川河上枣园水文站的实测水文资料,对比分析该站水沙变化趋势和流域内水土流失变化情况,探讨西川河流域实施退耕还林的成效。

The serious soil and water erosion in upper stream of Yanhe River is the main source of sediment in the watershed.Based on the measured data of Zaoyuan hydrologic station in Xichuanhe River,the paper comparatively analyzed the changing trend of water and sediment and the situation of soil and water erosion,dicussed the effect of returnins formland for forests in Xichuanhe River Basin.