Journal
EURASIAN SOIL SCIENCE
Volume 50, Issue 4, Pages 422-431Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S1064229317020089
Keywords
soil organic matter; labile and stable pools; CO2 emission; decomposition of plant residues; humification; mineralization; soil temperature and moisture; temperature coefficient Q(10)
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Funding
- Russian Foundation for Basic Research [14-04-01738, 13-04-00034]
- Russian Science Foundation [14-14-00625]
- Russian Science Foundation [17-14-00077] Funding Source: Russian Science Foundation
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The mineralization and humification of leaf litter collected in a mixed forest of the Prioksko-Terrasny Reserve depending on temperature (2, 12, and 22A degrees C) and moisture (15, 30, 70, 100, and 150% of water holding capacity ( WHC)) has been studied in long-term incubation experiments. Mineralization is the most sensitive to temperature changes at the early stage of decomposition; the Q (10) value at the beginning of the experiment (1.5-2.7) is higher than at the later decomposition stages (0.3-1.3). Carbon losses usually exceed nitrogen losses during decomposition. Intensive nitrogen losses are observed only at the high temperature and moisture of litter (22A degrees C and 100% WHC). Humification determined from the accumulation of humic substances in the end of incubation decreases from 34 to 9% with increasing moisture and temperature. The degree of humification C-HA/C-FA is maximum (1.14) at 12A degrees C and 15% WHC; therefore, these temperature and moisture conditions are considered optimal for humification. Humification calculated from the limit value of litter mineralization is almost independent of temperature, but it significantly decreases from 70 to 3% with increasing moisture. A possible reason for the difference between the humification values measured by two methods is the conservation of a significant part of hemicelluloses, cellulose, and lignin during the transformation of litter and the formation of a complex of humic substances with plant residues, where HSs fulfill a protectoral role and decrease the decomposition rate of plant biopolymers.
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