Carbon density and carbon spatial distribution pattern in six dominant forest stands were studied based on the biomass and soil organic matter data from 182 sample plots in Mulanweichang, Hebei Province. The average carbon density of the six tested forest stands ranged from 142.083 to 218.6947 t/hm2. The carbon density of Populus davidiana natural second-ary forests was the highest, followed by shrub forests, Betula puatyphylla natural secondary forests, Larix principis-rupprechtii plantations, Quercus mongolica natural secondary forests and Pinus tabulaeformis natural secondary forests. The percentages of carbon storage in soil carbon pool, tree carbon pool, undergrowth and litter layer were 77.9％ -93.0％, 8.5％ -20.7％, 0. 2％ -2.0％ and 1.2％ -3.2％, respectively. Shrub forest is one of the most important forest carbon pools.%采用典型抽样与分层取样方法,调查收集了182块林分样地的生物现存量与碳密度,研究了木兰围场6种主要林分的碳密度及其分配特征.结果表明:落叶松人工林、油松人工林、山杨天然次生林、白桦天然次生林、蒙古栎天然次生林和灌木林6种林分类型的森林碳密度为142.083～218.6947t/hm2,排序为山杨林＞灌木林＞白桦林＞落叶松林＞蒙古栎林＞油松林;在林分碳密度中,土壤碳库占77.9%～93.0%,乔木层碳库占8.5%～20.7%,林下灌草层(除灌木林)占0.2%～2.0%,枯落物层碳库占1.2%～3.2%;灌木林是陆地生态系统重要碳库.
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