Volume 31 Issue 9
Sep.  2023
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RAN J W, QI X, WU D, HUANG M, CAI Z J, HUANG Y P, ZHANG W J. Impacts of biochar application on soil nutrient availability and exchangeable based cations: a meta-analysis[J]. Chinese Journal of Eco-Agriculture, 2023, 31(9): 1449−1459. DOI: 10.12357/cjea.20230026
Citation: RAN J W, QI X, WU D, HUANG M, CAI Z J, HUANG Y P, ZHANG W J. Impacts of biochar application on soil nutrient availability and exchangeable based cations: a meta-analysis[J]. Chinese Journal of Eco-Agriculture, 2023, 31(9): 1449−1459. DOI: 10.12357/cjea.20230026
shu

Impacts of biochar application on soil nutrient availability and exchangeable based cations: a meta-analysis

  • 1.

    Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences / Key Laboratory of Cultivated Land Quality Monitoring and Evaluation, Ministry of Agriculture and Rural Affairs / State Key Laboratory of Efficient Utilization of Arid and Semi-Arid Arable Land in Northern China, Beijing 100081, China

  • 2.

    School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China

  • 3.

    College of Land Science and Technology, China Agricultural University, Beijing 100083, China

  • 4.

    Red Soil Experimental Station of Chinese Academy of Agricultural Sciences in Hengyang, Qiyang 426182, China

Funds: This study was supported by the Major Science and Technology Special Project of Xinjiang Uygur Autonomous Region (2022A02007-1) and the National Key Research and Development Program of China (2021YFD1901201).
More Information
  • Corresponding author:

    HUANG Yaping, E-mail: huangyaping@caas.cn

  • Received Date: January 10, 2023
  • Accepted Date: March 30, 2023
  • Available Online: June 06, 2023
    Graphical Abstract
    • Abstract
  • In order to accurately assess the effects of biochar application on soil nutrient availability and exchangeable based cations, a total of 2000−2020 published literature was collected to obtain 648 matched data for no biochar application (blank or no addition) and single biochar application, and 430 matched data for no biochar application and biochar co-application with fertilizer. A meta-analysis was performed to quantify the effects of different biochar applications on soil N and P availability (total N, NH4+-N, NO3–-N, Olsen-P), salt-based ions contents (K+, Ca2+, Na+, and Mg2+), and cation exchange capacity (CEC). Results showed that the application of biochar (alone or combined with chemical fertilizers) significantly increased soil N and P content by 14.0%−128.1%, and salt-based ions contents by 22.5%−270.2%, respectively. By comparing the effects of different biochar application, it was found that the increasing of soil N and P availability in chemical fertilizer combination treatment was higher than that in biochar application alone, while the increasing of salt-based ions contents in biochar application alone was higher than that in chemical fertilizer combination. Further analysis showed that when the pH of biochar was higher than 8, the application of biochar alone significantly increased soil Olsen-P content by 10.3%−58.5%. When the biochar pyrolysis temperature was higher than 500℃, the application of biochar alone increased the soil salt-based ions contents by 33.9%−384.7%. When the application rate of biochar was less than 10 t∙hm−2, soil Olsen-P content increased higher under biochar combined with chemical fertilizer (374.1%) than that of biochar application alone (2.1%). In addition, applying biochar to soil with pH<6.5 could effectively increase soil N, P and Ca2+ contents, with Olsen-P content and CEC increased by 45.0% and 17.9%, respectively, under biochar application alone. Therefore, the application of biochar could effectively improve soil nutrient availability and ion exchange properties, and reducing environmental risks. In practical applications, biochar can be applied alone or in combination with fertilizer depending on the specific aims. Taking into account the characteristics of biochar, application rate, and soil conditions, the effective use of biochar to improve soil fertility will be the priority direction of the high-quality agricultural development in the future.
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