首页|Comparing the temperature sensitivity of organic matter decomposition in oxic and oxygen-deprived soils
Comparing the temperature sensitivity of organic matter decomposition in oxic and oxygen-deprived soils
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·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,varia-tions 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 demon-strated 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.
State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China
State Key Laboratory of Subtropical Silviculture,Zhejiang A & F University,Hangzhou 311300,China
University of Chinese Academy of Sciences,Beijing 100049,China
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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National Key Research and Development Program of ChinaNational Natural Science Foundation of China
NETL
NSTL
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