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Greenhouse gas mitigation and soil carbon stabilization potential of forest biochar varied with biochar type and characteristics.
Sapkota, Sundar; Ghimire, Rajan; Bista, Prakriti; Hartmann, Dale; Rahman, Tawsif; Adhikari, Sushil.
Afiliación
  • Sapkota S; New Mexico State University, Department of Plant and Environmental Sciences, Las Cruces, NM, USA.
  • Ghimire R; New Mexico State University, Department of Plant and Environmental Sciences, Las Cruces, NM, USA; New Mexico State University, Agricultural Science Center, Clovis, NM, USA. Electronic address: rghimire@nmsu.edu.
  • Bista P; New Mexico State University, Department of Plant and Environmental Sciences, Las Cruces, NM, USA; New Mexico State University, Agricultural Science Center, Clovis, NM, USA.
  • Hartmann D; Biosystems Engineering Department, Auburn University, 200 Corley Building, Auburn, AL 36849, USA.
  • Rahman T; Biosystems Engineering Department, Auburn University, 200 Corley Building, Auburn, AL 36849, USA.
  • Adhikari S; Biosystems Engineering Department, Auburn University, 200 Corley Building, Auburn, AL 36849, USA.
Sci Total Environ ; 931: 172942, 2024 Jun 25.
Article en En | MEDLINE | ID: mdl-38719032
ABSTRACT
Biochar is increasingly used in climate-smart agriculture, yet its impact on greenhouse gas (GHG) emissions and soil carbon (C) sequestration remains poorly understood. This study examined biochar-mediated changes in soil properties and their contribution to C stabilization and GHG mitigation by evaluating four types of biochar. Soil carbon dioxide (CO2) and nitrous oxide (N2O) emissions, soil chemical and biological properties, and soil organic carbon (SOC) mineralization kinetics were monitored using greenhouse, laboratory, and modeling experiments. Three pine wood biochars pyrolyzed at 460 °C (PB-460), 500 °C (PB-500), 700 °C (PB-700), and one pine bark biochar from gasification at 760 °C (GB-760) were added into soil at 1 % w/w basis. Soils amended with biochar were used to cultivate sorghum for three months in a greenhouse, followed by three months of laboratory incubation. Data obtained from laboratory incubation was modeled using various statistical approaches. The PB-500 and PB-700 reduced cumulative N2O-N emissions by 68.5 % and 73.9 % and CO2 equivalent C emissions by 66.9 % and 72.4 %, respectively, compared to unamended control. The N2O emissions were positively associated with soil nitrate N, available P, and biochar ash content while negatively associated with SOC. The CO2 emission was negatively related to biochar CN ratio and volatile matter content. Biochar amended soils had 49.2 % (PB-500) to 87.7 % (PB-700) greater SOC and 22.9 % (PB-700) to 48.1 % (GB-760) greater sorghum yield than the control. While PB-700 had more saprophytes than the control, the GB-760 yielded a greater yield than biochars prepared by pyrolysis. Microbial biomass C was 7.23 to 23.3 % greater in biochar amended soils than in control. The double exponential decay model best explained the dynamics of C mineralization, which was associated with initial soil nitrate N and available P positively and total fungi and protozoa biomass negatively. Biochar amendment could be a climate smart agricultural strategy. Pyrolysis pine wood biochar showed the greatest potential to reduce GHG emissions and enhance SOC storage and stability, and gasification biochar contributed more to SOC storage and increased crop yield.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Suelo / Carbono / Carbón Orgánico / Gases de Efecto Invernadero Idioma: En Revista: Sci Total Environ Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Suelo / Carbono / Carbón Orgánico / Gases de Efecto Invernadero Idioma: En Revista: Sci Total Environ Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Países Bajos