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Comparing the temperature sensitivity of organic matter decomposition in oxic and oxygen-deprived soils |
Zhenhui Jiang1,3, Xin Wang1,2,4, Ting Liu1, Xiaojuan Feng1,2( ) |
1. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Hangzhou 311300, China
4. Henan Key Laboratory of Ecological Environment Protection and Restoration of Yellow River Basin, Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China |
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Abstract ● No consistent variation was found in soil respiration Q10 under various O2 conditions. ● Substrate C quality had a strong effect on Q10 in oxic soils. ● N limitation had a large impact on Q10 in soils under O2 limitation. Current studies on the temperature sensitivity (Q10) of soil organic matter (SOM) decomposition mainly focus on aerobic conditions. However, variations and determinants of Q10 in oxygen (O2)-deprived soils remain unclear. Here we incubated three grassland soils under oxic, suboxic, and anoxic conditions subjected to varying temperatures to compare variations in Q10 in relation to changing substrates. No consistent variation was found in Q10 under various O2 conditions. Further analysis of edaphic properties demonstrated that substrate carbon quality showed a strong influence on Q10 in oxic soils, whereas nitrogen limitation played a more important role in suboxic and anoxic soils. These results suggest that substrate carbon quality and nitrogen limitation may play roles of varying importance in determining the temperature sensitivity of SOM decomposition under various O2 conditions.
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| Keywords
oxygen-limited conditions
temperature sensitivity
soil respiration
carbon substrate
nitrogen limitation
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Corresponding Author(s):
Xiaojuan Feng
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Issue Date: 10 December 2023
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