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杉木不同密度造林试验，结果表明：造林密度每公顷4995株的林地，每公顷平均村积生长量为9．315m3,每公顷年均产值6408．90元。分另］是林龄27年、造林密度3600株／hm2林地的2．49倍和2．38倍；是林龄13年，造林密度3000株／hm2的1．66倍和1．67倍。试验证明在杉木分布区北缘的低山丘陵区，采用合理密植造林，集约经营的管理方式、缩短轮伐期，来提高林地的经济效益是切实可行的。
The experiment of afforestation with different densities of Chinese fir showed that the average volume growth per hectare was 9.315m3 in forest land with planting density of 4995 hectares per hectare and annual output value was 6408.90 Yuan per hectare. It is 2.49 times and 2.38 times more than those of 27 years of afforestation and 3600 plants per hectare of afforestation. It is 1.66 times and 1.67 times of 13 years of afforestation and afforestation density of 3000 plants / hm2. The experiment proves that it is feasible to improve the economic benefits of woodland in the hilly region in the northern margin of the fir distribution area by rational management of close planting and intensive management and shortening the rotation period.