The effect of geocryological conditions and soil properties on the spatial variation in the CO₂ emission from flat-topped peat mounds in the isolated permafrost zone of Western Siberia

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• 作者：A. A. Bobrik ; O. Yu. Goncharova ; G. V. Matyshak ; I. M. Ryzhova…
• 关键词：СО2 emission ; organic matter ; peat cryozems (Histic Oxyaquic Turbic Cryosols) ; peat gleyzems (Histic Reductaquic Cryosols) ; cryoturbated gleyzems (Reductaquic Turbic Cryosols) ; cryozems (Oxyaquic Turbic Cryosols) ; oligotrophic peat soils (Fibric Histosols)
• 刊名：Eurasian Soil Science
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：49
• 期：12
• 页码：1355-1365
• 全文大小：
• 刊物主题：Geotechnical Engineering & Applied Earth Sciences;
• 出版者：Pleiades Publishing
• ISSN：1556-195X
• 卷排序：49

文摘

The active layer thickness, CO2 emission, and contents of organic substances (including the total organic carbon, labile carbon, and the carbon of microbial biomass) in the soils of flat-topped peat mounds in the area of the Nadym Experimental Station in the north of Western Siberia (experimental site CALM R1) are characterized by considerable spatial variability. The low values of the CО₂ emission are confined to the microelevations on the peatland surface. The high values of the emission (>200 mg CO₂/(m2 h)) are typical of the soils with the highest content of the carbon of microbial biomass and the lowest content of the labile organic carbon. The soils of elevated flat-topped peat mounds statistically differ from the soils of waterlogged mires in the contents of total, labile, and microbial carbon and in the CO₂ emission values. Though the soils of elevated flat-topped peat mounds are characterized by the high content of the carbon of microbial biomass (4260 ± 880 mg С/kg soil), the CO₂ emission from them is low (158 ± 23 mg CO₂/(m2 h)), which is explained by the structure of microbial communities in the cryogenic soils and by the effect of specific hydrothermic conditions.