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Biochar Improves Sustainability of Green Roofs via Regulate of Soil Microbial Communities

Author

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  • Haoming Chen

    (School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

  • Xianfeng Du

    (School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

  • Mengqi Lai

    (School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

  • Muhanmaitijiang Nazhafati

    (School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

  • Chen Li

    (School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

  • Weicong Qi

    (Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjng 210014, China)

Abstract

Green roofs are an important part of urban green spaces. A good roof soil system contributes to the stability of the green roof ecosystem in harsh environments. Biochar as a soil additive can improve soil nutrients, although the mechanism of improvement on the roof substrate is still unclear. This research studied the effects on the physical and chemical properties of green roof soil and analyzed the biological characteristics of green roofs at five gradient ratios of biochar addition (0%, 5%, 10%, 15% and 20% biochar; v / v ). The results indicated that biochar could improve the soil porosity (5.3–9.3%) and reduce the bulk density (3.9–10.8%); increase the soil moisture (14.0–37.2%); adjust the temperature, available nutrients and cation exchange capacity (38.1–75.9%) and regulate the soil pH values of the green roof. The biomass of soil microbes, eukaryotes and plants were increased by 75.3%, 199.2% and 57.5%, respectively. Meanwhile, the correlation between microbial diversity and soil nutrients was more significant due to the addition of biochar, and the increase of the phosphorus (P) and carbon (C) contents was the main factor affecting the microbial community. The structural equation model showed that biochar has a direct impact on the microbial diversity by improving the soil moisture, temperature and available nutrients, and the increase of the microbial diversity is conducive to plant growth. Summarily, biochar can be considered as a potential additive for roof soil amendment and promoting the growth of plants and microbes, which is beneficial to the development of a roof ecosystem.

Suggested Citation

  • Haoming Chen & Xianfeng Du & Mengqi Lai & Muhanmaitijiang Nazhafati & Chen Li & Weicong Qi, 2021. "Biochar Improves Sustainability of Green Roofs via Regulate of Soil Microbial Communities," Agriculture, MDPI, vol. 11(7), pages 1-12, July.
    • Handle: RePEc:gam:jagris:v:11:y:2021:i:7:p:620-:d:586519
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    References listed on IDEAS

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    1. Rosseel, Yves, 2012. "lavaan: An R Package for Structural Equation Modeling," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 48(i02).
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    Cited by:

    1. Weiwei Xiong & Juan Li & Hankun Wang & Yongbo Wu & Dongchang Li & Jianhui Xue, 2023. "Biochar Addition and the Runoff Quality of Newly Constructed Green Roofs: A Field Study," Sustainability, MDPI, vol. 15(5), pages 1-13, February.
    2. Elisabeth Srihayu Harsanti & Asep Nugraha Ardiwinata & Sukarjo & Hidayatuz Zu'amah & Asep Kurnia & Mas Teddy Sutriadi & Dedi Nursyamsi & Wahida Annisa Yusuf & Anicetus Wihardjaka, 2024. "Nitrogen losses (N2O and NO3-) from mustard (Brassica juncea L.) cropping applied urea coated bio-charcoal," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 70(1), pages 1-10.
    3. repec:caa:jnlpse:v:preprint:id:282-2023-pse is not listed on IDEAS
    4. Kai Huang & Jun Zhang & Guangming Tang & Da Bao & Tangyu Wang & Deping Kong, 2023. "Impacts and mechanisms of biochar on soil microorganisms," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 69(2), pages 45-54.

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