Abstract:RESUMOAvaliaram-se os parâmetros C orgânico , C microbiano , atividades de celulase e amilase em amostras de uma Terra Roxa Estruturada sob mata natural (MN), nas áreas sob pastagem por 20 anos (P20), pastagem por 25 anos P(25) e sob cultivo do algodoeiro por 10 anos (A10), obtidas no verão nas profundidades de 0-10, 10-20 e 20-30 cm. Os teores de C orgânico , C microbiano e as atividades de amilase e celulase foram muito semelhantes entre MN e nas áreas P20 e P25. Somente foi observada redução em 18% do C org… Show more
“…Similar MBCs between native forest and pasture areas were also found in studies carried out in São Paulo (Marchiori Júnior and Mello, 1999) and Rio de Janeiro (Silva et al, 2012a).…”
Section: Carbon and Microbial Biomass Activitysupporting
confidence: 82%
“…In pasture areas, high MBC is associated with the root system of grasses, which is abundant and active throughout the year (Marchiori Júnior and Mello, 1999), and also with animal-derived organic matter (Toda et al, 2010), which likely enhanced the availability of organic substrates for soil microbiota (Oliveira et al, 2001). Toda et al (2010) found that pasture areas exhibit higher content of animal-derived organic matter and MBC compared to different cropping systems.…”
Section: Carbon and Microbial Biomass Activitymentioning
ABSTRACT:The removal of original vegetation for crops and pasture production and then followed by natural regeneration is a standard practice in the Atlantic Forest, which has produced patches with different degrees of degradation and regeneration across the landscape. The aim of this study was to evaluate the effects of replacement of native forest by pasture and natural regeneration of vegetation on soil and on soil organic matter (SOM) dynamics in the dry and rainy season in an Atlantic Forest fragment in Passa Vinte, Minas Gerais (MG), Brazil. Soil samples were collected in the rainy and dry season, at a depth of 0.00-0.05 m. The variables determined were total organic carbon (TOC) and particle-size fractions of SOM [particulate organic carbon
“…Similar MBCs between native forest and pasture areas were also found in studies carried out in São Paulo (Marchiori Júnior and Mello, 1999) and Rio de Janeiro (Silva et al, 2012a).…”
Section: Carbon and Microbial Biomass Activitysupporting
confidence: 82%
“…In pasture areas, high MBC is associated with the root system of grasses, which is abundant and active throughout the year (Marchiori Júnior and Mello, 1999), and also with animal-derived organic matter (Toda et al, 2010), which likely enhanced the availability of organic substrates for soil microbiota (Oliveira et al, 2001). Toda et al (2010) found that pasture areas exhibit higher content of animal-derived organic matter and MBC compared to different cropping systems.…”
Section: Carbon and Microbial Biomass Activitymentioning
ABSTRACT:The removal of original vegetation for crops and pasture production and then followed by natural regeneration is a standard practice in the Atlantic Forest, which has produced patches with different degrees of degradation and regeneration across the landscape. The aim of this study was to evaluate the effects of replacement of native forest by pasture and natural regeneration of vegetation on soil and on soil organic matter (SOM) dynamics in the dry and rainy season in an Atlantic Forest fragment in Passa Vinte, Minas Gerais (MG), Brazil. Soil samples were collected in the rainy and dry season, at a depth of 0.00-0.05 m. The variables determined were total organic carbon (TOC) and particle-size fractions of SOM [particulate organic carbon
“…Wardle (1992) cita que os valores de C microbiano nem sempre se relacionam com o C orgânico do solo. O C orgânico do solo também não se correlacionou com o C microbiano na profundidade de 10-20 cm em solo sob mata natural, pastagens e cultivo anual do algodoeiro (Marchiori Júnior, 1998). CONCLUSÕES 1.…”
Termos para indexação: manejo do solo, uso do solo, ácido húmico, humina, ácido fúlvico, carbono orgânico, carbono microbiano, compostos orgânicos.
CHANGES IN ORGANIC MATTER AND IN MICROBIAL BIOMASS OF A NATURAL FOREST SOIL UNDER DIFFERENT MANAGEMENTABSTRACT -The effect of soil management on forms of carbon and microbial biomass was studied in a Typic Euthortox soil. The treatments tested were: natural forest; natural forest till 1976 and coffee till 1994 (sampling on the shoot projection and between lines ); natural forest till 1976, coffee till 1991 and corn till 1994; natural forest till 1940, coffee till 1960, citrus till 1978 and sugar cane till 1994 (sampling on the planting line and between lines ). The treatment with sugar cane presented the largest values of microbial carbon in relation to the natural forest. The agricultural management of soil increased the percentage of organic carbon in humic and fulvic acids forms. The soil presented more than 74% of organic carbon in the form of residual humus.
“…Ao contrário, nos meses mais chuvosos, houve aumento na atividade microbiana e na relação CBM/ COT, mesmo não havendo alterações significativas nos teores de COT no ano (Figura 2B). Valores de CBM/ COT menores que 1.0, tal como encontrado nos sistemas sob café, também foram observados em outras áreas com monoculturas (NUNES et al,2006;MARCHIORI JÚNIOR & MELO, 1999 (Figura 4A). Esses resultados indicam que a maior disponibilidade de P inorgânico no solo diminui a dependência de um ecossistema em relação à ciclagem do P orgânico pela atividade da fosfatase, resultando em menores valores de atividade dessa enzima (TARAFDAR & JUNGK, 1987).…”
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