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Soil Organic Carbon Dynamics Responses to Soil Fertility in the Agricultural Regions of China

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Abstract

Increasing the soil organic carbon (SOC) content in croplands can not only improve the soil fertility, but also mitigate climate warming. To evaluate the extent of soil organic carbon density (SOCD) and SOC stock, the examination and prediction of the changes in SOC are essential. Using a field denitrification–decomposition model simulates the dynamics of SOC in the cultivated layer (Ap horizon, all soil depths of sites were 0–30 cm) across all croplands in China. The model simulations results showed that the SOCD and stock approach 3.69 ± 1.09 kg C m−2 and 4.73 ± 1.39 Pg C for the 128.2 M ha croplands in 2040, respectively. Interestingly enough, changes in SOC content (ΔSOC) and soil total nitrogen, soil available phosphorus, and soil available potassium showed negative correlations (P < 0.01), while soil pH value had positive (P < 0.01) correlation with ΔSOC in the cultivated layer. Excess fertilizer can be a disadvantage for SOC accumulation, Chinese croplands have relatively low SOCD and used good amount of fertilizer in comparison with the global average, but the croplands could have great potentials for soil carbon stock under better agricultural “watershed” management practices.

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Abbreviations

SOC:

Soil organic carbon

SOCD:

Soil organic carbon density

TN:

Soil total nitrogen

AP:

Soil available phosphorus

AK:

Soil available potassium

pH:

Soil pH value

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Acknowledgements

This work was supported by Strategic Priority Research Program-Climate Change: Carbon Budget and Related Issues of Chinese Academy of Sciences (XDA05050405). We also want to thank Prof. Changsheng Li for provision of the DNDC model on the Internet for free use. In addition, the authors would like to express their deep gratitude to the anonymous reviewers for their valuable suggestions that greatly improved the manuscript.

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Authors and Affiliations

  1. College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Ürümqi, 830052, China

    D. L. Han, X. P. Zhu & H. T. Jia

  2. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, Jilin, China

    P. J. Yu

  3. Xinjiang Key Laboratory of Soil and Plant Ecological Processes, College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Ürümqi, 830052, China

    D. L. Han, X. P. Zhu & H. T. Jia

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  1. D. L. Han
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  2. X. P. Zhu
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  3. H. T. Jia
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  4. P. J. Yu
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Correspondence to H. T. Jia or P. J. Yu.

Appendices

Appendix 1

See Table 4.

Table 4 Summary of the changes in cropland soil organic carbon (SOC, g kg−1) contents in China
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Appendix 2

See Table 5.

Table 5 Soil and dominant crop types for seven agricultural regions in China
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Appendix 3

See Table 6.

Table 6 Global and regional cropland SOCD from different estimates
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Han, D.L., Zhu, X.P., Jia, H.T. et al. Soil Organic Carbon Dynamics Responses to Soil Fertility in the Agricultural Regions of China. Agric Res 6, 281–295 (2017). https://doi.org/10.1007/s40003-017-0263-9

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