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通过对中亚热带米槠次生林皆伐、火烧前后生态系统(乔木层地上部分和地下部分、林下植被层、枯枝落叶层及0~100 cm矿质土壤层)碳贮量变化进行研究,探讨皆伐火烧对中亚热带米槠次生林生态系统碳贮量的影响.结果表明,米槠次生林皆伐前生态系统碳贮量为278.6 t·hm-2,其中乔木层占64%,而林下植被层与枯枝落叶层碳贮量较低;皆伐后,树干(包含树皮)及粗枝被移出生态系统,其中包含97.5 t·hm-2的碳,相当于生态系统碳贮量的35%.火烧后2 d,采伐剩余物(包含枯枝落叶层物)碳贮量损失31.9 t·hm-2,损失率高达87%,而土壤表层(0~10 cm)碳贮量为(20.0 t·hm-2),较火烧前下降了18%.由此可见,皆伐和火烧均造成生态系统碳贮量显著下降.
Through the study on the changes of carbon storage in the secondary forest of Mirabia subtropical forests, the carbon storage before and after the fire (above and below the arbor layer, subterranean layer, understory layer, litter layer and 0-100 cm mineral soil layer) The results showed that the carbon storage of secondary ecosystem before secondary delamination was 278.6 t · hm-2, in which the arbor layer accounted for 64%, while the understory vegetation layer And the lower litter layer. After clearing, the trunk (including the bark) and the thick branches were removed from the ecosystem and contained 97.5 t · hm-2 of carbon, equivalent to 35% of the ecosystem carbon stock After 2 days of fire, the carbon storage loss (including litter) was 31.9 t · hm-2, and the loss rate was as high as 87%, while the carbon storage in the soil surface (0-10 cm) was (20.0 t · Hm-2), which was 18% lower than that before the fire, indicating that both clear cutting and burning caused a significant decrease in carbon storage in the ecosystem.