气候变化研究进展 ›› 2018, Vol. 14 ›› Issue (1): 59-66.doi: 10.12006/j.issn.1673-1719.2017.048

• 气候变化影响 • 上一篇    下一篇

冻融作用对大兴安岭多年冻土区泥炭地土壤有机碳矿化的影响研究

王娇月1,2(), 韩耀鹏3, 宋长春4(), 郗凤明1,2   

  1. 1 中国科学院沈阳应用生态研究所,沈阳 110016
    2 中国科学院污染生态与环境工程重点实验室,沈阳 110016
    3 辽宁省电力有限公司沈阳供电公司,沈阳 100300
    4 中国科学院东北地理与农业生态研究所,长春 130102
  • 收稿日期:2017-03-06 修回日期:2017-05-18 出版日期:2018-01-31 发布日期:2018-01-30
  • 作者简介:

    作者简介:王娇月,女,助理研究员,wangjiaoyue@iae.ac.cn;宋长春(通信作者),男,研究员,songcc@iga.ac.cn

  • 基金资助:
    国家重点研发计划(2016YFA0602303);国家自然科学基金(41603068,41473076)

Effects of freezing-thawing cycles on soil organic carbon mineralization in the peatland ecosystems from continuous permafrost zone, Great Hinggan Mountains

Jiao-Yue WANG1,2(), Yao-Peng HAN3, Chang-Chun SONG4(), Feng-Ming XI1,2   

  1. 1 Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
    2 Key Laboratory of Pollution Ecology and Environmental Engineering, Chinese Academy of Sciences, Shenyang 110016, China
    3 Liaoning Electric Power Company, State Grid, Shenyang 100300, China
    4 Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
  • Received:2017-03-06 Revised:2017-05-18 Online:2018-01-31 Published:2018-01-30

摘要:

冻融循环是影响土壤碳氮生物地球化学过程较为重要的因素。在全球变化背景下,冻融作用对冻土区土壤碳库稳定性及其关键生物地球化学过程影响研究是当前国际热点,尤其是冻融作用影响下多年冻土区泥炭地土壤有机碳矿化研究目前仍未明确。选取我国大兴安岭多年冻土区泥炭地表层(0~15 cm)和深层(15~30 cm)土壤,采用冻融试验及室内培养方法,探索分析了冻融作用影响下泥炭地土壤有机碳矿化特征,并从土壤活性碳和土壤酶活性角度阐述了影响机制。结果表明在短期的培养中,土壤有机碳矿化量在483~2836 mg/kg间波动,而冻融循环均显著降低了表层和深层土壤有机碳矿化量,并且对深层土壤有机碳的矿化抑制作用更为明显,高达76%。值得注意的是,冻融循环却明显促进了CH4的排放,尤其是表层土壤,高达145%。冻融循环作用也显著增加了土壤可溶性有机碳(DOC)含量,但却降低了土壤微生物量碳(MBC)以及土壤纤维素酶、淀粉酶和蔗糖酶活性。冻融作用下低的土壤酶活性以及相对低质量碳是抑制土壤有机碳矿化的原因。全球变暖背景下,与单纯温度增加所导致的土壤有机碳矿化释放量相比,冻融循环作用能降低大兴安岭泥炭地活动层中土壤有机碳在短期内碳的释放。

关键词: 冻融循环, 泥炭地, 有机碳矿化, 土壤酶, 活性碳

Abstract:

Freezing-thawing process is an important factor controlling carbon dynamics in mid-high latitude regions. Recently, there has been a growing interest in the effects of freezing-thawing cycle (FTC) on soil carbon stability and associated bio-geochemical process in mid-high latitude regions under global warming. The effects of FTC on soil organic carbon mineralization in peatland of permafrost region are still unclear. In this study, we collected soil samples from active layer (0-15 cm and 15-30 cm) of an undisturbed permafrost peatland in the Great Hinggan Mountains, Northeast China, and then subjected them to FTC simulation and mineralization incubation experiments. Our goal was to characterize soil mineralization in peatland by FTC and to determine the corresponding influencing factors. The results showed that cumulative organic carbon mineralization including CO2 and CH4 ranged from 483 mg/kg to 2836 mg/kg. FTC significantly decreased peatland soil organic carbon mineralization in 0-15 cm and 15-30 cm layers, especially for the 15-30 cm soil layer that the decrease magnitude reached up to 76%. Notably, FTC obviously promoted CH4 emission, and the emission in 15-30 cm soil layer increased by up to 145%. Meanwhile, FTC significantly increased soil dissolved organic carbon (DOC) concentration, but reduced microbial biomass carbon (MBC) concentration and amylase, cellulase and sucrase activities. Lower enzyme activities and relatively inferior quality carbon were the reasons for the decreased soil organic mineralization in FTC treatment. Under global warming, compared with the effect of only temperature increase, FTC can decrease the soil organic carbon mineralization during the short incubation stage in the permafrost peatland of Great Hinggan Mountains.

Key words: Freezing-thawing cycle, Peatland, Organic carbon mineralization, Soil enzyme, Active carbon

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