3种森林群落的生物量及碳密度特征

Characteristics of biomass and carbon density of three forest communities

研究了马尾松(Pinus massoniana)人工纯林、针阔混交次生林和针阔混交人工林3种森林群落的生物量及碳密度特征。结果表明,(1)3种森林群落中,群落生物量、乔木层生物量、草本层生物量和枯落物层干重均是马尾松林最大,灌木层生物量则是针阔混交次生林最大,各层生物量均是针阔混交人工林最小;(2)地上生物量大小顺序是马尾松林>针阔混交次生林>针阔混交人工林;地下生物量大小顺序则是针阔混交次生林>马尾松林>针阔混交人工林。针阔混交次生林根茎比(R/S)最大,为0.27(±0.01);(3)马尾松林的碳密度最高,为79.71(±16.92)t/hm2,其次是针阔混交次生林,为64.46(±12.61)t/hm2,针阔混交人工林最小,仅为59.62(±15.22)t/hm2;(4)乔木层碳占群落碳的比例大小顺序为马尾松林>针阔混交人工林>针阔混交次生林。

Biomass and carbon density characteristics were studied in Masson pine （Pinus massoniana） forests, mixed needle-broadleaved secondary forests and mixed needle-broadleaved artificial forests. The results showed that among the three forest types the maximums of community biomass, arbor layer biomass, grass layer biomass and litter layer weight were found in the Masson pine forests, the maximum of shrub layer biomass was found in the mixed needle-broadleaved secondary forests, the minimum of biomass in different layers was found in the mixed needle-broadleaved artificial forests, （2） The aboveground biomass was in the order of the Masson pine forests, the mixed needle-broad leaved secondary forests and the mixed needle-broadleaved artificial forests, whereas the underground biomass was the mixed needle-broadleaved secondary forests〉the Masson pine forests 〉 the mixed needle-broadleaved artificial forests. The highest ratio of root to stem was found in the mixed needle-broadleaved secondary forests, which was 0.27（±0.01）. （3） The Masson pine forests had the highest carbon density with an value of 79.71 （±16.92） t/hm2 the mixed needle-broadleaved secondary forests occupied second with a value of 64.46 （±12.61） t/hm2 and the mixed needle-broadleaved artificial forests had the lowest carbon density, which was 59.62（±15.22） t/hm2. （4） The ratio of arbor layer carbon density to community carbon density was in the order of the Masson pine forests, the mixed needle-broadleaved artificial forests, the mixed needle-broadleaved secondary forests.