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The temperature sensitivity of organic carbon mineralization is affected by exogenous carbon inputs and soil organic carbon content
S. S. Dai, L. J. Li, R. Z. Ye, X. Zhu-Barker and W. R. Horwath; Li LJ(李禄军)
2017
Source PublicationEuropean Journal of Soil Biology
Volume81Pages:69-75
AbstractTemperature sensitivity of organic carbon (C) mineralization is affected by C inputs, but predicting the magnitude of the response remains a challenge. We investigated how temperature and exogenous C inputs affected the apparent organic C mineralization in soils with a range of soil organic C (SOC) contents. Soils with 2.9, 4.0, and 6.8% SOC content were incubated with or without C sources (either plant residues or glucose), at two temperatures (15 or 25 degrees C) for 120 days. Apparent organic C mineralization was significantly affected by SOC content and C inputs. Cumulative CO2 production in soils with a higher SOC content was less sensitive to C inputs. Glucose was always more effective in stimulating CO2 production than plant residue. Without exogenous C inputs, the temperature sensitivity of organic C mineralization (described by Q(10) value) was higher in the 4.0% SOC soil (2.31) than in the 2.9% (1.12) and 6.8% SOC soils (130). The addition of exogenous C decreased Q(10) values by up to 131% in the 4.0% SOC soil, which was not observed in other two soils. In general, C inputs increased the Q(10) of the estimated active (C-a) and stable C (C-s) pools in all the tested soils, especially the C-s pool in the 4.0 and 6.8% SOC soils. Results indicated that the effect of C inputs on apparent organic C mineralization (either stimulatory or inhibitory) is influenced by SOC content and C source, and that temperature sensitivity of organic C mineralization in the presence of exogenous C is highly sensitive to SOC content. (C) 2017 Elsevier Masson SAS. All rights reserved.
DOI10.1016/j.ejsobi.2017.06.010
WOS IDWOS:000408076100010
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Document Type期刊论文
Identifierhttp://ir.iga.ac.cn/handle/131322/7570
Collection湿地与全球变化学科组
Corresponding AuthorLi LJ(李禄军)
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GB/T 7714
S. S. Dai, L. J. Li, R. Z. Ye, X. Zhu-Barker and W. R. Horwath,Li LJ. The temperature sensitivity of organic carbon mineralization is affected by exogenous carbon inputs and soil organic carbon content[J]. European Journal of Soil Biology,2017,81:69-75.
APA S. S. Dai, L. J. Li, R. Z. Ye, X. Zhu-Barker and W. R. Horwath,&李禄军.(2017).The temperature sensitivity of organic carbon mineralization is affected by exogenous carbon inputs and soil organic carbon content.European Journal of Soil Biology,81,69-75.
MLA S. S. Dai, L. J. Li, R. Z. Ye, X. Zhu-Barker and W. R. Horwath,et al."The temperature sensitivity of organic carbon mineralization is affected by exogenous carbon inputs and soil organic carbon content".European Journal of Soil Biology 81(2017):69-75.
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