Biogas residues in the battle for terrestrial carbon sequestration: A comparative decomposition study in the grassland soils of the Greater Region

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:286

Article

Tsachidou, Bella^1,4  Hissler, Christophe¹  Noo, Anais¹  George, Sebastien F.¹  Daigneux, Benjamin²  Gennen, Jerome²  Pacaud, Stephane³  George, Isabelle F.⁴  Delfosse, Philippe⁵ 

[1] ERIN, Luxembourg Inst Sci & Technol, Belvaux, Luxembourg

[2] Agra Ost Asbl, Sankt Vith, Belgium

[3] Univ Lorraine, ENSAIA, Vandoeuvre Les Nancy, France

[4] Univ Libre Bruxelles, Lab Ecol Syst Aquat, Brussels, Belgium

[5] Univ Luxembourg, Maison Savoir, Esch Sur Alzette, Luxembourg

关键词: Anaerobic digestion;    Biofertilizers;    Climate change;    Sustainable agriculture;    Nitrogen pollution;    Arbuscular mycorrhizal fungi;   

DOI  :  10.1016/j.jenvman.2021.112272

来源: Elsevier

【 摘 要 】

The recycling of biogas residues resulting from the anaerobic digestion of organic waste on agricultural land is among the means to reduce chemical fertilizer use and combat climate change. This in sacco decomposition study investigates (1) the potential of the granulated biogas residue fraction to provide nutrients and enhance soil carbon sequestration when utilized as exogenous organic matter in grassland soils, and (2) the impact of different nitrogen fertilizers on the organic matter decomposition and nutrient release processes. The experiment was conducted in two permanent grasslands of the Greater Region over one management period using rooibos tea as a comparator material. The decomposition and chemical changes of the two materials after incubation in the soil were assessed by measuring the mass loss, total carbon and nitrogen status, and fibre composition in cellulose, hemicellulose and lignin. Overall, after the incubation period, granulated biogas residue maintained up to 68% of its total mass, organic matter and total carbon; increased its content in recalcitrant organic matter by up to 45% and released 45% of its total nitrogen. Granulated biogas residue demonstrated resilience and a higher response uniformity when exposed to different nitrogen fertilizers, as opposed to the comparator material of rooibos tea. However, the magnitude of fertilizer-type effect varied, with ammonium nitrate and the combinatorial treatment of raw biogas residue mixed with urea leading to the highest organic matter loss from the bags. Our findings suggest that granulated biogas residue is a biofertilizer with the potential to supply nutrients to soil biota over time, and promote carbon sequestration in grassland soils, and thereby advance agricultural sustainability while contributing to climate change mitigation.

【 授权许可】

Free