土壤的融化会影响到土壤有机碳的周转与释放，中科院东北地理与农业生态研究所湿地与全球变化学科组王宪伟助理研究员等研究分析了中国大兴安岭多年冻土区泥炭地在泥炭藓层（0-10cm）-泥炭层（40-50cm）-多年冻土层（80-90cm）融化过程中CO2和CH4的释放特征。
研究结果表明：在有氧和厌氧的环境下，融化都会使土壤中的碳快速释放；泥炭藓层释放最多的CO2，但泥炭藓层CH4的释放量最低，而泥炭层和多年冻土层都有CH4的大量释放，释放的CH4包括泥炭和多年冻土中封存的CH4和微生物分解释放的CH4；对比融化前后，泥炭藓层（0-10cm）分解的温度敏感性具有降低的趋势，根部层（10-20cm）分解的温度敏感性变化不大，泥炭层（40-50cm）和多年冻土层（80-90cm）分解的温度敏感性具有增加的趋势。研究指出，融化过程中碳的排放受到不同环境下泥炭和多年冻土土壤中可溶性有机碳、微生物量碳以及土壤酶活性等多种因素的影响。相关研究结果发表在Atmos Environ (2013；75：77-82)上。（生物谷Bioon.com）
生物谷推荐的英文摘要
Atmospheric Environment DOI: 10.1016/j.atmosenv.2013.04.056
Carbon release from Sphagnum peat during thawing in a montane area in China
Wang， Xianwei； Song， Changchun； Wang， Jiaoyue； Miao， Yuqing； Mao， Rong； Song， Yanyu
Soil thawing may affect the turnover of soil organic carbon (C) and the release of C to the atmosphere. Little is known about C release during thawing in the Great Hing'an Mountains， China. Through the incubations， we studied the emissions of CO2 and CH4 during thawing from the Sphagnum moss layer to the permafrost layer under aerobic and anaerobic conditions. Carbon was released quickly during thawing under different conditions. The Sphagnum moss layer produced more CO2 than the other layers. However， there was little CH4 release during thawing in the Sphagnum moss layer and burst of CH4 emissions in the peat and permafrost soils. These bursts include stored CH4 in the frozen samples and productions from microbial activity. The temperature sensitivity during thawing decreased across the freezing point in the Sphagnum moss layer， did not change greatly in the root layer， and increased greatly in the peat and permafrost layers. Changes in soil substrates and enzyme activities may affect C release during thawing.
