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Effects of Biodegradation of Corn-Starch–Sodium-Alginate-Based Liquid Mulch Film on Soil Microbial Functions

Author

Listed:
  • Xia Gao

    (State Environmental Protection Key Laboratory of Food Chain Pollution Control, Beijing Technology and Business University, Beijing 100048, China
    Key Laboratory of Cleaner Production, Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China)

  • Chenxing Fu

    (State Environmental Protection Key Laboratory of Food Chain Pollution Control, Beijing Technology and Business University, Beijing 100048, China
    Key Laboratory of Cleaner Production, Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China)

  • Mingxiao Li

    (State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China)

  • Xuejiao Qi

    (State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China)

  • Xuan Jia

    (State Environmental Protection Key Laboratory of Food Chain Pollution Control, Beijing Technology and Business University, Beijing 100048, China
    Key Laboratory of Cleaner Production, Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China)

Abstract

In response to the problems of the poor degradability and mechanical properties of liquid mulch, natural non-toxic polymer compound corn starch and sodium alginate were used to prepare fully biodegradable liquid mulch. The preparation conditions of the mulch were optimized, and the mechanical properties of the mulch and the changes in the microbial community in soil with the mulch degradation were analyzed. The corn-starch–sodium-alginate-based liquid mulch film had an optimum performance at a tensile strength of 0.145 MPa and an elongation at a break of 16.05%, which was attained by adding 33.33% sodium alginate, 50% glycerol 22 and 4% citric acid to corn starch after moist heat modification. Fourier transform infrared spectroscopy analysis showed that the -COOH in sodium alginate could interact with the -OH in starch and glycerol through hydrogen bonding, thus, resulting in a denser structure and better mechanical properties of the liquid mulch as a non-crystalline material. The soil burial degradation study of mulch revealed that corn-starch–sodium-alginate-based liquid mulch degraded completely at 25 days macroscopically, and mulch degradation increased soil organic matter content. Microbial kinetic analysis showed that the abundance and diversity of the bacterial community decreased with the degradation of the mulch, which was conducive to the optimization of the bacterial community structure and function. Arthrobacter of the class Actinomycetes became the dominant microorganism, and its abundance increased by 16.48-times at 14 days of mulch degradation compared with that before degradation, and Acidophilus phylum (14 days) decreased by 99.33%. The abundance of fungal communities was elevated in relation to the main functional microorganisms involved in liquid mulch degradation, with Alternaria and Cladosporium of the Ascomycete phylum Zygomycetes being the most active at the early stage of mulch degradation (7 days), and the relative abundance of Blastocystis was significantly elevated at the late stage of mulch degradation (14 days), which increased by 13.32%. This study provides important support for the green and sustainable development of modern agriculture.

Suggested Citation

  • Xia Gao & Chenxing Fu & Mingxiao Li & Xuejiao Qi & Xuan Jia, 2022. "Effects of Biodegradation of Corn-Starch–Sodium-Alginate-Based Liquid Mulch Film on Soil Microbial Functions," IJERPH, MDPI, vol. 19(14), pages 1-14, July.
  • Handle: RePEc:gam:jijerp:v:19:y:2022:i:14:p:8631-:d:863782
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    References listed on IDEAS

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    1. Adhikari, Raju & Bristow, Keith L. & Casey, Philip S. & Freischmidt, George & Hornbuckle, John W. & Adhikari, Benu, 2016. "Preformed and sprayable polymeric mulch film to improve agricultural water use efficiency," Agricultural Water Management, Elsevier, vol. 169(C), pages 1-13.
    2. Sun, Tao & Li, Geng & Ning, Tang-Yuan & Zhang, Zhi-Meng & Mi, Qing-Hua & Lal, Rattan, 2018. "Suitability of mulching with biodegradable film to moderate soil temperature and moisture and to increase photosynthesis and yield in peanut," Agricultural Water Management, Elsevier, vol. 208(C), pages 214-223.
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