Content and carbon stocks in labile and recalcitrant organic matter of the soil under crop-livestock integration in Cerrado

• Published in: Semina. Ciências agrárias : revista cultural e científica da Universidade Estadual de Londrina Vol. 34; no. 6Supl1; pp. 3377 - 3388
• Main Authors: Itaynara Batista, Marcos Gervasio Pereira, Maria Elizabeth Fernandes Correia, Wanderlei Bieluczyk, Jolimar Antônio Schiavo, Janaína Ribeiro Costa Rows
• Format: Journal Article
• Language: English
• Published: Universidade Estadual de Londrina 01.12.2013
• Subjects: aims to develop strategies for increasing their levels in soils and better understanding of its dynamics. This work aimed to evaluate the fractions of soil organic matter and their carbon stocks in different soil cover system in crop-livestock integration and native Cerrado vegetation. The study was conducted at the farm Cabeceira; bulk density; corn and cotton + brachiaria and in the rainy season were corn; cotton / soybean area and a native of Savanna. Was performed to determine the exchangeable cations; cotton and soybeans; crops present were: pasture; dry (May/2009) and rainy (March 2010); in the dry season; Maracajú – MS; organic carbon; particle size analysis; particle size fractionation of organic matter of the soil with the quantification of particulate organic carbon (POC) and organic carbon associated with minerals (OCam). Was also quantified the carbon stock and size fractions. The area of pasture / maize showed higher carbon stock in the particulate fraction in the topsoil. The area of cotton / soy due to its lower clay; Particle size fractionation; Seasonality; Management; sample area have the following history: soybean/corn + brachiaria/cotton/oat + pasture/soybean/formation of pasture/grazing; sampling was carried out in two seasons; showed the greatest loss of carbon. Because of the areas have the same history; so the areas in the two evaluation periods were: pasture / maize + brachiaria / cotton; the stock of more recalcitrant fraction was not sensitive to variations in coverage. The POC fraction appears more sensitive to different soil covers and seasonality; The study of organic matter and its compartments and their relationship with management
• ISSN: 1676-546X; 1679-0359
• DOI: 10.5433/1679-0359.2013v34n6Supl1p3377

The study of organic matter and its compartments and their relationship with management, aims to develop strategies for increasing their levels in soils and better understanding of its dynamics. This work aimed to evaluate the fractions of soil organic matter and their carbon stocks in different soil cover system in crop-livestock integration and native Cerrado vegetation. The study was conducted at the farm Cabeceira, Maracajú – MS, sample area have the following history: soybean/corn + brachiaria/cotton/oat + pasture/soybean/formation of pasture/grazing, sampling was carried out in two seasons, dry (May/2009) and rainy (March 2010), in the dry season, crops present were: pasture, corn and cotton + brachiaria and in the rainy season were corn, cotton and soybeans, so the areas in the two evaluation periods were: pasture / maize + brachiaria / cotton, cotton / soybean area and a native of Savanna. Was performed to determine the exchangeable cations, particle size analysis, bulk density, organic carbon, particle size fractionation of organic matter of the soil with the quantification of particulate organic carbon (POC) and organic carbon associated with minerals (OCam). Was also quantified the carbon stock and size fractions. The area of pasture / maize showed higher carbon stock in the particulate fraction in the topsoil. The area of cotton / soy due to its lower clay, showed the greatest loss of carbon. Because of the areas have the same history, the stock of more recalcitrant fraction was not sensitive to variations in coverage. The POC fraction appears more sensitive to different soil covers and seasonality.