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在低丘红壤上设立湿地松纸浆林每公顷900～2 700株的5种初植密度随机区组试验,8年的结果表明,随造林密度增大,林分胸径、冠幅、活冠层长度和单株材积减小,不同密度间有显著差异;造林密度对树高生长没有显著影响。8龄时每公顷初植密度2 250株以上的林分已到间伐始伐期,但间伐下的小径材无造纸价值。结合造纸利用分析,每公顷1 350～1 800株是湿地松纸浆林较适宜的初植密度。
In the hilly red soil, the planting density of 500 ~ 2 700 plants per hectare was set up in a randomized block test. The result of 8 years showed that with the increase of plantation density, the stand diameter, crown width, live canopy Length and plant volume decreased, there was a significant difference between different densities; afforestation density had no significant effect on tree height growth. At the 8th instar, the initial planting density of more than 2 250 plants per hectare has reached the beginning of thinning, but the small-diameter timber under thinning has no paper-making value. According to the analysis of papermaking utilization, 1 350 ~ 1 800 plants per hectare is the most suitable initial planting density for Pinus elliottii pulp forest.