Data/hora: 04/06/2024 04:25:00

Biblioteca(s): | Embrapa Soja.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | A - 1
Data corrente: | 03/12/2010
Data da última atualização: | 03/08/2017
Autoria: | KASCHUK, G.; ALBERTON, O.; HUNGRIA, M.
Afiliação: | GLACIELA KASCHUK, CNPSo; ODAIR ALBERTON, CNPSo; MARIANGELA HUNGRIA DA CUNHA, CNPSO.
Título: | Three decades of soil microbial biomass studies in Brazilian ecosystems: lessons learned about soil quality and indications for improving sustainability.
Ano de publicação: | 2010
Fonte/Imprenta: | Soil Biology & Biochemistry, Oxford, v. 42, p. 1-13, 2010.
DOI: | doi:10.1016/j.soilbio.2009.08.020
Idioma: | Português
Conteúdo: | Soil microbial biomass plays important roles in nutrient cycling, plant?pathogen suppression, decomposition of residues and degradation of pollutants; therefore, it is often regarded as a good indicator of soil quality. We reviewed more than a hundred studies in which microbial biomass-C (MB-C), microbial quotient (MB-C/TSOC, total soil organic carbon) and metabolic quotient (qCO2) were evaluated with the objective of understanding MB-C responses to various soil-management practices in Brazilian ecosystems. These practices included tillage systems, crop rotations, pastures, organic farming, inputs of industrial residues and urban sewage sludge, applications of agrochemicals and burning. With a metaanalysis of 233 data points, we confirmed the benefits of no-tillage in preserving MB-C and reducing qCO2 in comparison to conventional tillage. A large number of studies described increases in MB-C and MB-C/TSOC due to permanent organic farming, also benefits from crop rotations particularly with several species involved, whereas application of agrochemicals and burning severely disturbed soil microbial communities. The MB-C decreased in overgrazed pastures, but increased in pastures rotated with wellmanaged crops. Responses of MB-C, MB-C/TSOC and qCO2 to amendment with organic industrial residues varied with residue type, dose applied and soil texture. In conclusion, MB-C and related parameters were, indeed, useful indicators of soil quality in various Brazilian ecosystems. However, direct relationships between MB-C and nutrient-cycling dynamics, microbial diversity and functionality are still unclear. Further studies are needed to develop strategies to maximize beneficial effects of microbial communities on soil fertility and crop productivity.
Thesagro: | Biomassa; Microbiologia do solo.
Thesaurus Nal: | Microbial biomass; Soil microorganisms; Soil quality.
Categoria do assunto: | S Ciências Biológicas
Registro original: | Embrapa Soja (CNPSO)
Exemplares: | CNPSO - (31551-1) - UPC - AP - PP - 11882 -  - 11882 - DIS