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  • Effects of warming and increased precipitation on soil carbon mineralization in an Inner Mongolian grassland after 6 years of treatments

    Author(s)
    Zhou, Xiaoqi
    Chen, Chengrong
    Wang, Yanfen
    Xu, Zhihong
    Hu, Zhengyi
    Cui, Xiaoyong
    Hao, Yanbin
    Griffith University Author(s)
    Xu, Zhihong
    Chen, Chengrong
    Zhou, Xiaoqi
    Hao, Yanbin
    Year published
    2012
    Metadata
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    Abstract
    Understanding the responses of soil C mineralization to climate change is critical for evaluating soil C cycling in future climatic scenarios. Here, we took advantage of a multifactor experiment to investigate the individual and combined effects of experimental warming and increased precipitation on soil C mineralization and 13C and 15N natural abundances at two soil depths (0-10 and 10-20 cm) in a semiarid Inner Mongolian grassland since April 2005. For each soil sample, we calculated potentially mineralizable organic C (C 0) from cumulative CO2-C evolved as indicators for labile organic C. The experimental warming significantly ...
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    Understanding the responses of soil C mineralization to climate change is critical for evaluating soil C cycling in future climatic scenarios. Here, we took advantage of a multifactor experiment to investigate the individual and combined effects of experimental warming and increased precipitation on soil C mineralization and 13C and 15N natural abundances at two soil depths (0-10 and 10-20 cm) in a semiarid Inner Mongolian grassland since April 2005. For each soil sample, we calculated potentially mineralizable organic C (C 0) from cumulative CO2-C evolved as indicators for labile organic C. The experimental warming significantly decreased soil C mineralization and C 0 at the 10-20-cm depth (P?<?0.05). Increased precipitation, however, significantly increased soil pH, NO 3 - -N content, soil C mineralization, and C 0 at the 0-10-cm depth and moisture and NO 3 - -N content at the 10-20-cm depth (all P?<?0.05), while significantly decreased exchangeable NH 4 + -N content and 13C natural abundances at the two depths (both P?<?0.05). There were significant warming and increased precipitation interactions on soil C mineralization and C 0, indicating that multifactor interactions should be taken into account in future climatic scenarios. Significantly negative correlations were found between soil C mineralization, C 0, and 13C natural abundances across the treatments (both P?<?0.05), implying more plant-derived C input into the soils under increased precipitation. Overall, our results showed that experimental warming and increased precipitation exerted different influences on soil C mineralization, which may have significant implications for C cycling in response to climate change in semiarid and arid regions.
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    Journal Title
    Biology and Fertility of Soils
    Volume
    48
    Issue
    7
    DOI
    https://doi.org/10.1007/s00374-012-0686-1
    Subject
    Carbon Sequestration Science
    Environmental Sciences
    Biological Sciences
    Agricultural and Veterinary Sciences
    Publication URI
    http://hdl.handle.net/10072/49896
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