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通过种甘薯、花生、龙眼与对照（裸地）4种处理研究了广东省南亚热带低丘荒坡地不同作物利用方式对水土流失的影响。研究结果表明，坡地种植甘薯的水土保持效果最好，可减少地表径流24．74％～97．30％，减少土壤侵蚀量89．86％～97．60％，降低土壤酸性，流失的有机物和无机物也最少。其次为龙眼、花生、裸地。分析结果建议在雨季大力推广坡地甘薯种植和在果树幼小期间间套种旱地作物西瓜、花生、大豆、甘薯、牧草等。
The effects of different crop utilization patterns on the soil and water loss in the barren hillsides of the southern subtropical zone in Guangdong Province were studied by four treatments of sweet potato, peanut, longan and control (bare land). The results showed that the best soil and water conservation effect of sweet potato on sloping land can reduce surface runoff 24.74% ~ 97.30%, reduce soil erosion 89.86% ~ 97.60%, reduce soil acidity, organic matter and organic matter Inorganic matter is also the least. Followed by longan, peanuts, bare land. The results suggest that vigorous promotion of sweet potato planting in sloping fields and interplanting of watermelons, peanuts, soybeans, sweet potatoes, grasses and the like in dry land should be carried out in the rainy season.