Data/hora: 17/06/2024 10:13:18

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