Seasonal variation of soil microbial biomass—The effects of clearfelling a tropical rainforest and establishment of pasture in the central Amazon

Luizão, Regina C. C.; Bonde, Torben A.; Rosswall, T.

doi:10.1016/0038-0717(92)90256-w

Cited by 167 publications

(86 citation statements)

References 35 publications

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“…Bittencourt et al (2006) found a higher SMBN content in Amazonian soils under secondary vegetation in the rainy season. Other studies in tropical forests indicated that seasonal variation in soil moisture is associated with seasonal variation in soil microbial C and N (Singh et al, 1989;Luizão et al, 1992;Srivastava, 1992). However, in this study no clear pattern of soil microbial mass variation associated with seasonal changes in soil moisture was observed.…”

Section: Discussioncontrasting

confidence: 88%

“…The dynamics of SMB are determined by biotic and abiotic factors that vary in space and over time in both natural and man-modified ecosystems (Jenkinson and Ladd, 1981;Wardle and Hungria, 1994). Variation in SMB over time is closely associated with changes in water availability in the soil (Patel et al, 2010), and its study contributes to the understanding of release and mineralization patterns (Wardle, 1998) of nutrients that will consequently be available for plants (Singh et al, 1989;Luizão et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Water Availability on Soil Microbial Biomass in Secondary Forest in Eastern Amazonia

Rangel‐Vasconcelos

Zarin²,

Oliveira

et al. 2015

Rev. Bras. Ciênc. Solo

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Soil microbial biomass (SMB) plays an important role in nutrient cycling in agroecosystems, and is limited by several factors, such as soil water availability. This study assessed the effects of soil water availability on microbial biomass and its variation over time in the Latossolo Amarelo concrecionário of a secondary forest in eastern Amazonia. The fumigation-extraction method was used to estimate the soil microbial biomass carbon and nitrogen content (SMBC and SMBN). An adaptation of the fumigation-incubation method was used to determine basal respiration (CO 2 -SMB). The metabolic quotient (qCO 2 ) and ratio of microbial carbon:organic carbon (C MIC :C ORG ) were calculated based on those results. Soil moisture was generally significantly lower during the dry season and in the control plots. Irrigation raised soil moisture to levels close to those observed during the rainy season, but had no significant effect on SMB. The variables did not vary on a seasonal basis, except for the microbial C/N ratio that suggested the occurrence of seasonal shifts in the structure of the microbial community.

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Section: Discussioncontrasting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Effect of Water Availability on Soil Microbial Biomass in Secondary Forest in Eastern Amazonia

Rangel‐Vasconcelos

Zarin²,

Oliveira

et al. 2015

Rev. Bras. Ciênc. Solo

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“…Em ecossistemas temperados, a biomassa microbiana representa 0,27 a 5,0 % do CO total para solos cultivados e 1,8 a 2,9 % para solos de floresta (Anderson & Domsch, 1986;Vance et al, 1987); em ecossistemas tropicais, esses valores variam de 1,8 a 4 % (Luizão, 1992;Henrot & Robertson, 1994). No presente estudo (Quadro 7), em todos os sistemas a inclinação foi negativa, com exceção do ADPC, demonstrando decréscimo da relação C mic /C solo com a profundidade, ou seja, diminuição na disponibilidade do CO do solo para a biomassa microbiana em profundidade.…”

Section: Carbono Orgânico Do Solo (C Solo )unclassified

Dinâmica do carbono da biomassa microbiana em cinco épocas do ano em diferentes sistemas de manejo do solo no cerrado

Ferreira

Resck

Gomes

et al. 2007

Rev. Bras. Ciênc. Solo

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“…A introdução de cultivos anuais ou perenes em ecossistemas naturais altera os fluxos de energia e nutrientes no sistema, com conseqüências muitas vezes negativas aos estoques de carbono do solo e na biodiversidade (Luizão et al, 1992;Corazza et al, 1999;Sposito & Zabel, 2003;Remigi et al, 2008).…”

Section: Introductionunclassified

Carbono orgânico e biomassa microbiana do solo em plantios de Acacia mangium no Cerrado de Roraima

et al. 2010

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RESUMOO objetivo do estudo foi avaliar os efeitos de plantios de Acacia mangium, localizados no cerrado em Roraima, sobre o carbono orgânico e biomassa microbiana do solo. Foram realizadas amostragens de solo nas profundidades de 0-20 cm e 20-40 cm em dois plantios de A. mangium com cerca de cinco anos de idade, e em duas áreas de Cerrado nativo consideradas referência. Um dos plantios de A. mangium (localizado na Fazenda Cigolina) correspondeu a um plantio homogêneo (espaçamento de 3,6 m entre linhas e 2,0 m entre plantas) enquanto que o outro (localizado no Campo Experimental Água Boa -CEAB) correspondeu a um plantio em faixas com duas linhas de plantio (espaçamento de 6 m entre linhas, 2,5 m entre plantas e cerca de 30 m entre faixas). As amostras de solo foram analisadas quanto ao carbono orgânico, carbono da biomassa microbiana, respiração basal do solo e quociente metabólico, além de atributos químicos de fertilidade. Foi verificado que os plantios de A. mangium não proporcionaram aumentos significativos do carbono orgânico do solo em comparação às áreas de referência. Entretanto, na média geral, esses plantios proporcionaram aumento do carbono da biomassa microbiana do solo e redução do quociente metabólico, indicando a possibilidade de acúmulo de carbono orgânico no solo em longo prazo. Também foi observado que, em comparação ao plantio da fazenda Cigolina e às áreas de referência, o carbono microbiano do solo foi maior e acompanhado de menor quociente metabólico no plantio de A. mangium no CEAB, mostrando que a estrutura de plantio exerceu influência sobre a biomassa microbiana do solo. PALAVRAS-CHAVE:Respiração basal do solo, quociente metabólico, Amazônia, plantios florestais, qualidade do solo. Soil organic carbon and soil microbial biomass in Acacia mangium plantation in the Savanna of Roraima ABSTRACTThe aim of this study was to evaluate the effects of Acacia mangium plantation in the Roraima's Savanna, on soil organic carbon and soil microbial biomass. Soil samplings were collected on the depths of 0-20 cm and 20-40 cm in two Acacia mangium plantation sites, about five years old, and in two sites of native savanna as reference. One of the A. mangium sites (located at Fazenda Cigolina) was composed by a homogeneous plantation (3.6 m between row and 2.0 m between trees) and, the other one (located at Campo Experimental Agua Boa Experimental -CEAB) was composed by a plantation on which the planting distances had strips of two rows 6 meters apart, 2.5 meters between trees and 30 meters between strips). Soil samples were analyzed regarding soil organic carbon, microbial biomass carbon, soil basal respiration and metabolic quotient, besides soil fertility attributes. Results showed that A. mangium plantations did not provide significant increases of organic carbon on the soil comparing with sites used as reference. However, generally, A. mangium plantation increased soil microbial biomass carbon and reduced metabolic quotient, indicating a possibility of soil organic carbon accumulation in long-term. It...

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Seasonal variation of soil microbial biomass—The effects of clearfelling a tropical rainforest and establishment of pasture in the central Amazon

Cited by 167 publications

References 35 publications

Effect of Water Availability on Soil Microbial Biomass in Secondary Forest in Eastern Amazonia

Effect of Water Availability on Soil Microbial Biomass in Secondary Forest in Eastern Amazonia

Dinâmica do carbono da biomassa microbiana em cinco épocas do ano em diferentes sistemas de manejo do solo no cerrado

Carbono orgânico e biomassa microbiana do solo em plantios de Acacia mangium no Cerrado de Roraima

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