Effects of biochar and biochar-based fertilizer on forest growth and soil fertility

XIAO Lin; FENG Weixun; LUO Zhizhong; LI Jing; LU Jie; ZHU Jieyi; ZENG Shucai

doi:10.7671/j.issn.1001-411X.202406002

Journal of South China Agricultural University > 2025 > > DOI: 10.7671/j.issn.1001-411X.202406002

XIAO Lin, FENG Weixun, LUO Zhizhong, et al. Effects of biochar and biochar-based fertilizer on forest growth and soil fertility[J]. Journal of South China Agricultural University, 2025, 46(3): 358-369. DOI: 10.7671/j.issn.1001-411X.202406002

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Effects of biochar and biochar-based fertilizer on forest growth and soil fertility

1.
College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
2.
Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524013, China
3.
Deqing Forestry in Guangdong Province, Zhaoqing 526000, China

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Abstract

Abstract

Objective
In order to study the impacts of biochar and biochar-based fertilizer application on the growth, nutrient uptake, and soil fertility of Michelia macclure, and provide a scientific foundation for encouraging the use of biochar in nutrient management on forest land.
Method
Taking the young forest of M. macclure as the research object, six treatments were set up, including no fertilization (CK) and application of compound fertilizer (CF), rice husk biochar (RB), wood chip biochar (WB), rice husk biochar-based fertilizer (RBF), and wood chip biochar-based fertilizer (WBF). After one year, the growth indices, quality indices, nutrient contents, and soil physicochemical properties of M. macclurei were measured.
Result
Compared with CK, the biomass, leaf area, leaf N content, and root N accumulation of M. macclure treated with biochar significantly increased, with the increases of 59.1%−62.2%, 44.7%−66.0%, 29.5%−45.4%, and 68.6%−92.3%, respectively. The Dickson quality index and whole-plant N, P, and K accumulations increased significantly when compound and biochar-based fertilizers were applied, with the increases of 136.8%−192.2%, 167.7%−267.4%, 124.4%−224.5%, and 191.5%−265.5%, respectively. Moreover, the application of compound fertilizer and biochar-based fertilizers had a greater impact on the growth of M. macclurei than the application of biochar alone. Compared to application of compound fertilizer alone, the application of biochar-based fertilizer was found to promote both plant growth and soil improvement. The RBF treatment significantly increased the soil pH, soil quick-acting K content, and SPAD value by 13.4%, 6.2%, and 99.7% respectively, while the WBF treatment significantly increased the whole-plant P and K accumulations and total biomass by 31.5%, 44.6%, and 22.1% respectively, and the soil bulk density significantly decreased by 17.3%. The fuzzy affiliation function revealed that the overall impact of treatments on M. macclurei growth and enhancement of soil physicochemical qualities was evaluated in the following order: WBF > RBF > CF > WB > RB > CK.
Conclusion
Both biochar and biochar-based fertilizer can enhance soil physicochemical qualities and successfully encourage the growth and uptake of nutrients by M. macclurei, and wood chip biochar-based fertilizer yields the greatest overall results, which offers a novel approach for managing nutrients in forest areas.
- Biochar-based fertilizer,
- Biochar,
- Michelia macclurei,
- Plant growth,
- Soil physicochemical property

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References (45)

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