Abstract
Histosols, often formed in wetland environments, provide an important global soil carbon (C) stock. Mineralization of soil organic C is an important process with broad implications for nutrient availability, soil quality, and global change. Temperature and moisture effects on C mineralization have been widely studied, but little information is available for temperature and moisture effects on C mineralization from recalcitrant sapric soil materials of warm climate Histosols. Our objectives were to determine Q 10 values (the factor by which the reaction rate increases with each 10 °C rise in temperature) for sapric soil material collected from a warm climate Histosol, to examine the influence of water content on Q 10, and to assess the optimum soil moisture condition for C mineralization. A laboratory incubation (48 h duration) was conducted including sapric soil material at three moisture conditions; approximately 0.15, 0.30, and 0.45 m3 m−3 water content by volume; and two temperatures; 25 and 37 °C. Calculated values for Q 10 were generally consistent with previous studies for other soil materials. Results indicated highest mineralization rates for both temperatures occurred at 0.30 m3 m−3 volumetric water content, corresponding to approximately 50 % water-filled pore space. But values for Q 10 increased as water content increased, demonstrating the important relationship between moisture and temperature effects for C mineralization for these organic soil materials.
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Taggart, M., Heitman, J.L., Shi, W. et al. Temperature and Water Content Effects on Carbon Mineralization for Sapric Soil Material. Wetlands 32, 939–944 (2012). https://doi.org/10.1007/s13157-012-0327-3
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DOI: https://doi.org/10.1007/s13157-012-0327-3