【摘要】 林草结合能保持地表水，减少地表径流，防止土壤退化，防止水土流失，发展绿色植被，也是长江上游地区保持水土的重要途径。更多还原

【Abstract】 Afforestation combined with planting grass could conservy surface water;reduce surface flow;prevent water losses and soil erosion as well as develop green vegetation.It was an important way for water and soil conservation in upper areas of Yangzi River.更多还原