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Effects of in-situ straw decomposition on composition of humus and structure of humic acid at different soil depths

  • Soils, Sec 1 • Soil Organic Matter Dynamics and Nutrient Cycling • Research Article
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Abstract

Purpose

Returning straw to soil improved soil carbon sequestration capacity and increase soil organic matter. However, in different soil depth, especially in subsoil, there were few studies on the effects of straw decomposition on soil carbon sequestration and the properties of humic substances. Therefore, an in-situ incubation study, with six different straw rates and three different soil depths, was carried out to explore the effects of straw decomposition on soil organic carbon and humic substance composition at different soil depths.

Materials and methods

The experiment was composed of six straw rates: 0, 0.44, 0.88, 1.32, 2.64, and 5.28% of soil dry mass. The maize straw was proportionately mixed with soil and put into nylon bags. Then, the nylon bags were buried in soil at three depths (15, 30, and 45 cm) and the straw decomposition trial lasted for 17 consecutive months in-situ. Soil samples were collected after completion of the field trial. Humic substances were quantitatively and qualitatively analyzed using the modification method of humus composition and the methods specified by the International Humus Association. Fourier transform infrared spectroscopy and fluorescence spectroscopy were used in this study.

Results and discussion

Results indicated that CO2 concentration increased with increase in soil depth. Compared with the “zero” straw control, soil organic carbon contents in the treatments amended with 1.32, 2.64, and 5.28% maize straw increased significantly, and most accumulations were at 30–45 cm depths. FTIR and fluorescence emission spectra analyses indicated that the addition of straw enhanced the aliphatic structure and decreased the aromaticity of humic acid (HA), that was to say that HA molecular structure approaches to the development of simplification and younger. The maximum change in HA molecular structure was under the 5.28% treatment in the 30–45 cm depth.

Conclusions

Returning maize straw to the subsoil layers is more conducive to the accumulation of soil organic carbon and improvement of the quality and activity of HA and the organic carbon in the subsoil can be renewed.

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Acknowledgements

Financial support for this study was provided by the Jilin Provincial Department of Science and Technology (LFGC14213) and Ministry of Science and Technology Food Project (2012BAD04B02). We also thank three anonymous reviewers for helpful comments to improve the manuscript.

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  1. College of Resources and Environmental Sciences, Jilin Agricultural University, Changchun, 130118, China

    Tingting Cui, Zhihong Li & Shijie Wang

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  1. Tingting Cui
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Correspondence to Zhihong Li.

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Responsible editor: Francisco Javier González-Vila

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Cui, T., Li, Z. & Wang, S. Effects of in-situ straw decomposition on composition of humus and structure of humic acid at different soil depths. J Soils Sediments 17, 2391–2399 (2017). https://doi.org/10.1007/s11368-017-1704-6

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