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本文对湖南会同地区在杉木林采伐后天然更新起来的20年生的马尾松林进行了生物量的测定。乔木层生物量采用“相对生长测定法”(Allometricmethod);下木层和草本层采用“样方收获法”。结果表明,林分总生物量为103.93吨/公顷,平均净生产量为5.45吨/公顷·年,其中乔木层分别为100.02吨/公顷和5.16吨/公顷·年,远远高于同年龄的欧洲赤松人工林;与湖南会同地区速生的杉木林比较,亦相差无几。从生物量的积累和分配来看,下层木的产量结构是不合理的,应是抚育间伐的对象。
In this paper, biomass of the 20-year-old Pinus massoniana forest, which was naturally renewed after the harvesting of Chinese fir forest in Huitong, Hunan Province, was measured. The biomass of arbor layer was based on “Allometric method” (AIM) and the sampling method was used on the understory and herb layer. The results showed that the total stand biomass was 103.93 tons / ha and the average net production was 5.45 tons / ha · year, of which the tree layer was 100.02 tons / ha and 5.16 tons / ha · year respectively, much higher than the same age European Pinus densiflora plantation; compared with the fast-growing Chinese fir plantation in Huitong district of Hunan Province, it is almost the same. From the biomass accumulation and distribution point of view, the output structure of the lower layer of wood is unreasonable and should be the object of thinning.