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Response Mechanism of Soil Carbon and Nitrogen Transformation to Polymer Materials Under Drip Irrigation

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Journal of Soil Science and Plant Nutrition Aims and scope Submit manuscript

Abstract

Purpose

Polymer materials positively affect the physical, chemical, and microbiological properties of soil. However, little is known about the response mechanism of soil carbon and nitrogen transformation to polymer materials.

Methods

This study explored the effects of three polymer materials (humic acid extracted from cottonseed meal, H; modified polymer prepared by using polyacrylamide as main raw material, P; and composite polymer material composed of humic acid and modified polymer, HP) on the soil physicochemical properties, organic carbon (TOC), total nitrogen (TN), carbon and nitrogen fractions, and bacterial community structure in planted and non-planted soils under drip irrigation.

Results

The results showed that the application of H and P reduced soil bulk density (BD), improved soil aggregate stability (including soil aggregates > 0.25 mm, R0.25; mean weight diameter, MWD; and mean geometric diameter, GWD), and increased the content of TOC, TN, and carbon and nitrogen fractions (including labile organic carbon content, LOC; soil carbon management index, CMI; NO3-N; NH4+-N; microbial biomass carbon, MBC; microbial biomass nitrogen, MBN). Polymer materials all could increase the diversity of bacterial communities, especially H (the diversity of bacterial communities in H treatment was 1.8% and 2.4% higher than that in the CK in planted and non-planted soil, respectively (p < 0.05)).

Conclusions

The application of H and P reduced soil BD, and improved soil R0.25, MWD, GWD, TOC, TN, LOC, CMI, NO3-N, NH4+-N, MBC, and MBN. Redundancy analysis (RDA) showed that the application of H and P improved soil TOC, TN, and carbon and nitrogen fractions by increasing the water stability of soil aggregate, and the increase of soil MBN indirectly improved the bacterial community structure.

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Funding

This study is funded by the S&T Program of Hebei (21326405D, 21326302D), the Natural Science Foundation of Hebei (D2020405002), and the Hebei North University level project (JYT2021003).

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Correspondence to Kaiyong Wang.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

Conflict of Interest

The authors declare no competing interests.

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Tian, X., Liu, Y., Wang, K. et al. Response Mechanism of Soil Carbon and Nitrogen Transformation to Polymer Materials Under Drip Irrigation. J Soil Sci Plant Nutr 22, 1351–1361 (2022). https://doi.org/10.1007/s42729-021-00737-0

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  • DOI: https://doi.org/10.1007/s42729-021-00737-0

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