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从1991－1996年对杉木-油桐-仙人草复合经营模式进行了研究结果表明：复合经营模式对防止水土流失，改善土壤肥力，促进杉木生长以及节约营林投资和提高经济收入，均有良好的效果。
From 1991 to 1996, the research on the compound management model of Chinese fir-tung tree-immortal grass showed that the compound management model was good for preventing soil erosion, improving soil fertility, promoting Chinese fir growth, saving investment in silviculture and raising economic income Effect.