Multilocation changes in soil carbon stocks from sugarcane straw removal for bioenergy production in Brazil

Autor(es)

Tenelli, Sarah ^{[1, 2]} ; Bordonal, Ricardo Oliveira ^[1] ; Cherubin, Mauricio Roberto ^[3] ; Cerri, Carlos Eduardo Pellegrino ^[3] ; Carvalho, Joao Luis Nunes ^[1]

Afiliação do(s) autor(es)

^[1] Brazilian Ctr Res Energy & Mat LNBR CNPEM, LNBR CNPEM Brazilian Biorenewables Natl Lab, Giuseppe Maximo Scolfaro St 10000, BR-13083100 Campinas, SP - Brazil

^[2] UNICAMP Univ Campinas, Interdisciplinary PhD Program Bioenergy, Campinas, SP - Brazil

^[3] Univ Sao Paulo, ESALQ USP Coll Agr Luiz Queiroz, Dept Soil Sci, Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Global Change Biology Bioenergy; v. 13, n. 7, p. 1099-1111, JUL 2021.
• Citações Web of Science: 1

Resumo

Sugarcane (Saccharum spp.) straw has been identified as a valuable asset for bioenergy production, but it is also a primary carbon input for sustaining soil resources. Therefore, excessive removal of this crop residue can potentially decrease soil organic carbon (SOC) and have negative environmental consequences. Most crop residue management studies focus on site-specific responses which are important, but do not provide comprehensive assessments across the multiple edaphoclimatic conditions needed by decision makers to guide sustainable sugarcane straw management. Temporal modifications in SOC stocks induced by straw removal were quantified in 10 field experiments located in south-central of Brazil. Each field experiment was arranged in a randomized block design with four replications, including four straw removal rates: total (TR), high (HR), low (LR) and no removal (NR). Soil sampling was performed to a 30 cm depth at the trial establishment (baseline) and after 2 and 4 consecutive years of straw removal. The data indicate that about 19% and 25% of the C added via straw were retained in areas of sandy and clay soils, respectively, and show that excessive removal rates depleted SOC stocks across the evaluated sites. Furthermore, regardless of removal rate, maintenance of straw on sandy soils was not sufficient to sustain SOC stocks, which were depleted by 2.3, 1.9, 1.5, and 1.4 Mg ha(-1) year(-1) for the TR, HR, LR, and NR. Our measured data provide scientific information to support policy and management decisions for straw-derived bioenergy in Brazil. They also suggest straw removal from clay soils will be less deleterious to SOC stocks than from sandy soils, where removal should be avoided. (AU)

• Processo FAPESP: 18/09845-7 - Implicações da expansão e intensificação do cultivo da cana-de-açúcar nos serviços ecossistêmicos do solo
• Beneficiário: Maurício Roberto Cherubin
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/50403-2 - Valorização da cadeia produtiva descentralizada de biomassa visando a produção de biocombustíveis avançados: desenvolvimento e avaliação de rotas termoquímicas integradas à produção de biomassas e a rotas bioquímicas
• Beneficiário: Antonio Maria Francisco Luiz Jose Bonomi
• Modalidade de apoio: Auxílio à Pesquisa - Parceria para Inovação Tecnológica - PITE
• Processo FAPESP: 17/23978-7 - Dinâmica do carbono do solo e balanço de gases de efeito estufa: implicações da remoção da palha de cana-de-açúcar para produção de bioenergia
• Beneficiário: Ricardo de Oliveira Bordonal
• Modalidade de apoio: Auxílio à Pesquisa - Regular