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Soil Carbon Emission Sources Differ Under Litter and Nutrient Addition During Secondary Succession: Evidence from a Mesocosm Study Using a Three-Transfer-Pool Model

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Abstract

A robust understanding of soil organic carbon (C) pools dynamics is important for predicting changes in the C cycle under ongoing climate change. However, the response of different soil C pools to litter and nutrient addition during the long-term secondary succession process remains unclear. We conducted a mesocosm study to reveal the dynamics of different soil C pools. Soil was incubated with litter and nutrient addition collected from five successional stages in the Ziwuling forest region in China. We then used the three-transfer-pool model to simulate C pool dynamics with C emissions data. Litter addition promoted slow C pool emissions during the early stages of secondary succession but inhibited active C pool and passive C pool emissions. Nutrient addition had positive effects on the emissions of C pools, with the exception of passive C pool; nitrogen addition had stronger effects on active C pool, and phosphorus addition had stronger effects on slow C pool. The effects of all addition treatments on the C emissions gradually decreased as succession progressed. The soil C emission sources differed under litter and nutrient addition during secondary succession. The priming effect and nutrient limitation contribute to changes in the soil C cycle.

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Acknowledgements

We thank prof. Yiqi Luo and his group for help with 3PX model simulation. We thank Dr. Zhuangdong Bai at the Northwestern Polytechnical University for intellectual feedback.

Funding

This study was funded by the National Science Foundation of China (32230067), the Fundamental Research Funds for the Central Universities (D5000220149), the Youth Talents Support Project in **’an City (095920221375), the Science, Technology and In-novation Commission of Shenzhen Municipality under Grant (KCXFZ20201221173004012), and the National College Students Innovation and Entrepreneurship Training Program (202110699221, S202110699563).

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Y.Z. and W.Y. conceptualized the research, designed the experiments, and oversaw project activities; T.L., C.L., and C.W. performed the model and data analysis; and Y.Z., R.S., and W.Y. drafted the manuscript. All authors were involved in revisions of the manuscript and approved the final version.

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Correspondence to Ran Sun or Yangquanwei Zhong.

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Li, T., Liao, C., Wang, C. et al. Soil Carbon Emission Sources Differ Under Litter and Nutrient Addition During Secondary Succession: Evidence from a Mesocosm Study Using a Three-Transfer-Pool Model. J Soil Sci Plant Nutr 23, 527–539 (2023). https://doi.org/10.1007/s42729-022-01063-9

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  • DOI: https://doi.org/10.1007/s42729-022-01063-9

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