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Mineralization Patterns of Maize Straw in Fluvio-Aquatic Soil as Determined by Isotopic Traces

Author

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  • Lixia Zhu

    (College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou 466001, China)

  • Jutian Chen

    (College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou 466001, China)

  • Lili Li

    (College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou 466001, China)

  • Fuli Zhang

    (College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou 466001, China)

  • Tianxue Liu

    (National Key Laboratory of Wheat and Maize Crop Science, Agricultural College of Henan Agricultural University, Zhengzhou 450002, China)

Abstract

The mineralization of plant residues results in changes in soil C and N. However, it is difficult to determine the origins of C and N from either soil organic matter mineralization or residue decomposition using traditional methods. An incubation experiment containing two treatments (blank soil (BS) and soil with 6% maize straw (MS)) was conducted to assess the contributions of maize straw to gas emissions, and to soil organic carbon (SOC) and total nitrogen (TN) using isotopic tracers. About 11.5% of maize straw C was sequestered in soil, the cumulative amount of C emitted from MS was 2.5-fold higher than that in BS treatment. A positive priming effect of maize straw on native SOC in the first 14 days was observed, and then became negative, indicating the potential for a positive balance of SOC storage. Cumulative N 2 O emissions in MS markedly decreased by 22.4% compared with BS, and the loss of N via N 2 O in MS was approximately 3.3%. Maize straw significantly increased soil TN and contributed 15.8% to TN at day 120. Our study clearly demonstrated that the different dynamics of 13 C and 15 N in the soils and gases indicated differences of maize straw C and N during decomposition. Maize straw C preferred to contribute to CO 2 emissions, while maize straw N contributed more to soil TN.

Suggested Citation

  • Lixia Zhu & Jutian Chen & Lili Li & Fuli Zhang & Tianxue Liu, 2020. "Mineralization Patterns of Maize Straw in Fluvio-Aquatic Soil as Determined by Isotopic Traces," Sustainability, MDPI, vol. 12(2), pages 1-13, January.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:2:p:621-:d:308794
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    References listed on IDEAS

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    1. Weidong Zhang & Xiaofeng Wang & Silong Wang, 2013. "Addition of External Organic Carbon and Native Soil Organic Carbon Decomposition: A Meta-Analysis," PLOS ONE, Public Library of Science, vol. 8(2), pages 1-6, February.
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