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对位于重庆铁山坪的46年生马尾松天然次生林的生物量结构与分布特征及生产力的研究结果表明,林分的初级生产力为8.34 t/(hm2.a),生物量为146.08 t/hm2,其中各层次的生物量分配顺序为:乔木层(87.43%)>枯枝落叶层(5.65%)>下木层(5.46%)>草本层(1.46%)。乔木层的生物量为127.72 t/hm2,其中各器官生物量比例的顺序是:树干(72.82%)>树枝(11.19%)>树根(9.27%)>树皮(4.43%)>针叶(2.29%)。在林分的各器官生物量的垂直结构方面,10 m以下树干生物量占其总量的81.13%;树枝的生物量主要集中在12~16 m,占其总量的82.25%;针叶的生物量主要集中在12~18 m,其中1年生针叶占其总量的93.25%;根系生物量主要集中在距地表深40 cm的土层内,占其总量的76.45%。当前,该林分生产力低,群落结构不合理,应对该种类型的森林群落进行林相改造,调整乔木层产量结构,以提高群落的综合效应。
The results of biomass structure, distribution and productivity of the 46-year-old masson pine secondary forest in Tieshanping, Chongqing showed that the primary productivity of the stand was 8.34 t / (hm2.a), the biomass was 146.08 t / hm2, The order of biomass allocation was as follows: arbor layer (87.43%)> litter layer (5.65%)> understorey layer (5.46%)> herb layer (1.46%). The biomass of arbor layer was 127.72 t / hm2, and the order of biomass of each organ was as follows: trunk (72.82%)> branch (11.19%)> tree root (9.27%)> bark (4.43% 2.29%). The biomass of trunk below 10 m accounted for 81.13% of the total biomass of each organ in the stand. The biomass of the branch mainly concentrated in 12-16 m, accounting for 82.25% of the total biomass. The biomass mainly concentrated in 12 ~ 18 m, of which 1-year-old needles accounted for 93.25% of the total. The root biomass mainly concentrated in the soil 40 cm deep, accounting for 76.45% of the total. At present, the stand productivity is low and the community structure is not reasonable. Forest type transformation of this type of forest community should be carried out and the yield structure of the tree layer should be adjusted so as to improve the comprehensive effect of the community.