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为了探索丘陵区用材林立体经营模式，于1989年开始．在湖南省衡南县，开展了杉木幼龄林—山苍子—黄豆、杉木中龄林—绞股蓝、杉木中龄林—生姜、湿地松—棕榈—黄豆4个经营类型试验，进行了林中生态因子、小气候因子的测定，病虫害情况和土壤调查，6a的试验结果表明：4个经营类型都能改善林内的微域环境，提高土壤肥力．增强林分抵抗病虫害的能力，显著提高上层林木的生长量此外，立体经营在前期即能从中层树木和下层作物获得一定的经济效益，克服了传统林业生产周期长、早期无经济效益的缺点，能有效地发挥林业的练合效益.
In order to explore the three-dimensional timber business model in hilly areas, began in 1989. In Hengnan County, Hunan Province, four management types of young Chinese fir plantations, Litsea cubeba - Soybean, Cunninghamia lanceolata - Gynostemma pentaphyllum, Cunninghamia lanceolata - Ginger, Pinus elliottii - Palm - Ecological factors, the determination of microclimate factors, pest and disease status and soil survey, 6a test results show that: 4 types of management can improve the forest micro-environment and improve soil fertility. In addition, three-dimensional management can obtain certain economic benefits from the middle-level trees and the lower crops in the early stage, overcome the shortcomings of the traditional forestry production cycle is long, no early economic benefits, Can effectively play the practice of forestry benefits.