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Biochar Application Increases Labile Carbon and Inorganic Nitrogen Supply in a Continuous Monocropping Soil

Author

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  • Rong Huang

    (College of Resources, Sichuan Agricultural University, Chengdu 611130, China
    Chongqing Key Laboratory of Soil Multi-Scale Interfacial Process, Chongqing 400715, China)

  • Bing Li

    (College of Resources, Sichuan Agricultural University, Chengdu 611130, China)

  • Yulan Chen

    (Liangshan Branch of Sichuan Tobacco Corporation, Xichang 615000, China)

  • Qi Tao

    (College of Resources, Sichuan Agricultural University, Chengdu 611130, China)

  • Qiang Xu

    (College of Resources, Sichuan Agricultural University, Chengdu 611130, China)

  • Denghong Wen

    (College of Resources, Sichuan Agricultural University, Chengdu 611130, China
    Liupanshui Bureau of Agriculture and Rural Areas, Liupanshui 553000, China)

  • Xuesong Gao

    (College of Resources, Sichuan Agricultural University, Chengdu 611130, China)

  • Qiquan Li

    (College of Resources, Sichuan Agricultural University, Chengdu 611130, China)

  • Xiaoyan Tang

    (College of Resources, Sichuan Agricultural University, Chengdu 611130, China)

  • Changquan Wang

    (College of Resources, Sichuan Agricultural University, Chengdu 611130, China)

Abstract

Biochar is an effective method for increasing soil carbon (C) sequestration and nitrogen (N) supply under continuous monocropping. To investigate the impact of biochar placement methods on soil C and N, a one-year field experiment with five treatments was conducted including control, mineral fertilizers only (F), biochar hole placement (BFH; biochar applied to the soil layer at 5–10 cm) + F, biochar band placement (BFB; biochar applied to the soil layer at 15–20 cm) + F, and biochar band and hole placement + F (BFBH). The results showed that, regardless of the placement method, biochar application increased soil total organic C (TOC) and C pool management index by 6.9–39.7% and 4.1–36.1%, respectively, especially for dissolved organic C (DOC; 6.9–51.3%), readily oxidizable C (ROC; 2.4–46.4%), and microbial biomass C (MBC; 10.4–41.7%). Single biochar placement methods significantly influenced DOC, MBC, and ROC contents of both soil layers in the rank order of BFH ≈ BFBH > BFB at 0–15 cm and BFB ≈ BFBH > BFH at 15–30 cm. Soil TN and microbial biomass N (MBN) mainly accumulated at the site of biochar placement. The increased soil TOC:TN and MBC:N ratios under biochar treatments promoted inorganic N immobilization and reduced the loss of ammonium N and nitrate N (NO 3 − -N) through leaching at the early stage of tobacco growth. Biochar-adsorbed N was remobilized at a later period (vigorous growth stage and maturity), possibly causing the slow decrease in NO 3 − -N content. Additionally, soil C and N pools were significantly influenced by the main effects of soil layer and growth stage. Overall, biochar application increased soil C and N pools and inorganic N supply through N remobilization. However, the increased labile organic C content and microbial activity may prevent C sequestration in biochar-amended soils.

Suggested Citation

  • Rong Huang & Bing Li & Yulan Chen & Qi Tao & Qiang Xu & Denghong Wen & Xuesong Gao & Qiquan Li & Xiaoyan Tang & Changquan Wang, 2022. "Biochar Application Increases Labile Carbon and Inorganic Nitrogen Supply in a Continuous Monocropping Soil," Land, MDPI, vol. 11(4), pages 1-17, March.
    • Handle: RePEc:gam:jlands:v:11:y:2022:i:4:p:473-:d:780046
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    References listed on IDEAS

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    1. Hafiz Muhammad Rashad Javeed & Mazhar Ali & Imtiaz Ahmed & Xiukang Wang & Ibrahim Al-Ashkar & Rafi Qamar & Abdullah Ibrahim & Muhammad Habib-Ur-Rahman & Allah Ditta & Ayman EL Sabagh, 2021. "Biochar Enriched with Buffalo Slurry Improved Soil Nitrogen and Carbon Dynamics, Nutrient Uptake and Growth Attributes of Wheat by Reducing Leaching Losses of Nutrients," Land, MDPI, vol. 10(12), pages 1-15, December.
    2. Shu-Yuan Pan & Cheng-Di Dong & Jenn-Fang Su & Po-Yen Wang & Chiu-Wen Chen & Jo-Shu Chang & Hyunook Kim & Chin-Pao Huang & Chang-Mao Hung, 2021. "The Role of Biochar in Regulating the Carbon, Phosphorus, and Nitrogen Cycles Exemplified by Soil Systems," Sustainability, MDPI, vol. 13(10), pages 1-34, May.
    3. Chavez, M.D. & Berentsen, P.B.M. & Oude Lansink, A.G.J.M., 2014. "Analyzing diversification possibilities on specialized tobacco farms in Argentina using a bio-economic farm model," Agricultural Systems, Elsevier, vol. 128(C), pages 35-43.
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    1. Rizki Maftukhah & Katharina M. Keiblinger & Ngadisih Ngadisih & Murtiningrum Murtiningrum & Rosana M. Kral & Axel Mentler & Rebecca Hood-Nowotny, 2023. "Post-Tin-Mining Agricultural Soil Regeneration Using Local Organic Amendments Improve Nitrogen Fixation and Uptake in a Legume–Cassava Intercropping System," Land, MDPI, vol. 12(5), pages 1-17, May.
    2. Theodora Bousdra & Sotiria G. Papadimou & Evangelia E. Golia, 2023. "The Use of biochar in the Remediation of Pb , Cd , and Cu -Contaminated Soils. The Impact of biochar Feedstock and Preparation Conditions on Its Remediation Capacity," Land, MDPI, vol. 12(2), pages 1-20, January.

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