皆伐火烧对中亚热带米槠次生林生态系统碳贮量的影响Carbon Pools in Secondary Forest of Castanopsis carlesis and Changes Associated with Clear-cutting and Burning in Mid-subtropical China
林伟盛;刘小飞;熊德成;胥超;杨智杰;郭剑芬;杨玉盛;
摘要(Abstract):
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0100 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(0100 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(010 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.
关键词(KeyWords): 皆伐;火烧;米槠次生林;碳贮量
基金项目(Foundation): 国家自然科学基金重点资助项目(31130013)
作者(Authors): 林伟盛;刘小飞;熊德成;胥超;杨智杰;郭剑芬;杨玉盛;
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