Atividade microbiana do solo em sistemas agroflorestais, monoculturas, mata natural e área desmatada

Júnior, Sebastião Lourenço de Assis; Zanúncio, José Cola; Kasuya, Maria Catarina Megumi; Couto, Laércio; Melido, Raul Cesar Nogueira

doi:10.1590/s0100-67622003000100005

Cited by 26 publications

(17 citation statements)

References 19 publications

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“…Assis (2008) reported that the production of accumulated CO 2 increased with the addition of waste in the form of labile C in the Lh from the State of Minas Gerais. Assis Júnior et al (2003) found higher BR values for native forest and pasture areas, and lower values for cultivated and deforested areas.…”

Section: Br Mbc and Qcomentioning

confidence: 91%

Humic Haplustox under different land uses in a high altitude environment in the Agreste region of Pernambuco, Brazil

Araújo

Ribeiro

Corrêa

et al. 2014

Rev. Bras. Ciênc. Solo

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SUMMARYThe Garanhuns Plateau in the Agreste region of the State of Pernambuco, Brazil is characterized by humid climatic conditions due to orographic rains, unlike the surrounding semiarid region. These soils are subjected to intense agricultural use and are extremely important for the regional economy. This study was carried out in the municipality of Brejão in the Agreste region with the aim of assessing changes in humic Haplustox soils subjected to different land uses. Four plots with different vegetation covers (native forest, secondary shrubby vegetation (capoeira), traditional cropping system, and planted pasture) were selected, and samples were taken from a soil profile and four small pits surrounding it at each site. Physical and chemical properties were assessed, including aggregate stability, humic organic fractions, and a microbiological evaluation through determination of basal respiration, microbial biomass carbon, and metabolic quotient. The soils under study showed physical and chemical properties typical of a Haplustox, such as low nutrient content, low cation exchange capacity, and high levels of acidity and Al saturation. The total organic carbon (TOC) contents were high regardless of the type of land use. Aggregates < 2 mm were dominant in all the conditions under study. The TOC content was higher in the soil under capoeira, 43.91 g kg -1 on the surface, while 34.36 and 33.43 g kg -1 of TOC were observed in the first layer of forest and pasture soils, respectively. While the microbial biomass C (MBC) was greater than 700 mg kg -1 in the forest and pasture areas (in the 0-5 cm layer), and 588 mg kg -1 in the soil under capoeira, these numbers were not statistically different. In the cultivated soil area, there was a reduction of around 28 % in TOC and MBC contents. Agricultural activity contributed to degradation of the humic 1338 horizon, as can be seen from a significant decrease in the TOC and changes in the relative distribution of the humic fractions. In contrast, aggregate stability was not altered as a function of the different land uses; the soil under planted pasture and capoeira were similar to the soil under native forest. Humin was the most important humified fraction for C reserves, contributing over 40 % of the TOC in these soils.Index terms: land use, highland soils, humic substances, aggregate stability, microbial biomass C. RESUMO: LATOSSOLOS AMARELOS HÚMICOS SOB DIFERENTES TIPOS DE UTILIZAÇÃO EM UM AMBIENTE ALTIMONTANO NO AGRESTE DE PERNAMBUCOO Planalto de Garanhuns, no Agreste de Pernambuco, destaca-se por apresentar características climáticas privilegiadas, favorecidas pelas chuvas orográficas, distinguindose da região semiárida circundante. Essas áreas mais úmidas são conhecidas como "brejos de altitude" e intensamente utilizadas e importantes para a economia regional. Este trabalho foi desenvolvido no município de Brejão, Agreste de Pernambuco, com o objetivo de identificar alterações nos atributos de Latossolos Amarelos Húmicos, submetidos às diferentes formas de uso do s...

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Section: Br Mbc and Qcomentioning

confidence: 91%

Humic Haplustox under different land uses in a high altitude environment in the Agreste region of Pernambuco, Brazil

Araújo

Ribeiro

Corrêa

et al. 2014

Rev. Bras. Ciênc. Solo

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“…In other Brazilian regions where measurements were also made with the AA methodology (Assis Júnior et al, 2003;Valentini et al, 2015), including forest and Cerrado (Brazilian tropical savanna) areas, there are no cases of low amplitude in ECO 2 values. The highest values were at least 50 % higher than the lowest, but were as much as eight times higher.…”

Section: Rev Bras Cienc Solo 2018;42:e0160563mentioning

confidence: 99%

“…Several studies point to advantages in using the AA methodology: Assis Júnior et al (2003) and Souto et al (2009) highlighted that it is a simple, low cost, and sensitive method that can be applied simultaneously at many points and that can integrate CO 2 evolutions over many hours (even 24 hours), therefore reducing spatial and temporal variability. If it is not possible to use an IRGA, which requires equipment that is expensive, has high maintenance costs, and demands a specially trained operator, use of the AA methodology is justified.…”

Section: Rev Bras Cienc Solo 2018;42:e0160563mentioning

confidence: 99%

Soil CO2 Efflux Measurements by Alkali Absorption and Infrared Gas Analyzer in the Brazilian Semiarid Region

Ferreira

Antonino

Sampaio

et al. 2018

Rev. Bras. Ciênc. Solo

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ABSTRACT:The CO 2 emission from the soil surface, commonly referred to as soil CO 2 efflux (ECO 2 ) or soil respiration, is the sum of processes that include root respiration and microbial activity. Measuring this evolution is important to establish sustainable land use models and to estimate global fluxes of carbon, which affect climate change. Despite its importance, few measurements have been made in areas of the semiarid Brazilian Northeast region, and most of them were made using the alkali absorption method (AA), which can underestimate ECO 2 . Measurements using AA were compared to measurements using the infrared gas analyzer method (IRGA) over ten months (in rainy and dry seasons), during the day and night, in areas of Caatinga (xeric shrubland and thorn forest) and pasture in the Agreste region of the state of Pernambuco. The ECO 2 measurements from AA varied little from night to day and throughout the year or in the rainy and dry seasons. However, those obtained from IRGA were higher in the rainy than in the dry season, but also without significant differences from day to night. The values of both methods were similar in the dry season, but in the rainy season they were higher with the IRGA. Therefore, AA seems to have little sensitivity to seasonal variations, in contrast with measurements from the IRGA, and it may underestimate soil ECO 2 when it attains higher values. This result indicates that some of the soil ECO 2 values determined in areas of the Brazilian semiarid region, and consequently annual C losses, may have been underestimated.

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“…É a soma total de todas as atividades metabólicas em que o CO 2 é produzido, podendo este ser utilizado como índice para monitorar as respostas dos ecossistemas aos distúrbios (BEHERA et al, 1990). …”

Section: Introductionunclassified

Cinética de evolução de dióxido de carbono em área de caatinga em São João do Cariri-PB

Araujo

Dantas

Andrade³

et al. 2011

Rev. Árvore

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Parente 5 RESUMO -Em decorrência da importância dos elementos meteorológicos nos diversos processos que ocorrem no solo, objetivou-se avaliar a cinética de evolução do dióxido de carbono (atividade microbiana) associada aos elementos meteorológicos em áreas de Caatinga, nas condições do semiárido paraibano. O experimento foi instalado em campo, na área da Bacia Escola/CCA/UFPB, Município de São João do Cariri, PB. A atividade microbiana diurna, medida pela liberação de CO 2 , foi avaliada mensalmente durante o período de janeiro a dezembro de 2008, em três áreas contíguas de Caatinga, correspondendo aos tratamentos: T 1 (10 animais -1 animal/3.200 m 2 ), T 2 (5 animais -1 animal/6.400 m 2 ) e T 3 (Controle -Sem animais). A área do experimento totalizou 9,6 ha, e em cada tratamento foi utilizada uma área de 3,2 ha. Foram selecionados em cada tratamento seis pontos de coleta (definidos ao acaso) . Os tratamentos foram distribuídos em delineamento de blocos inteiramente casualizados e arranjados em parcela subsubdividida (3x12x6), sendo três taxas de lotação (Parcela), 12 épocas de avaliação (Subparcelas) e 6 h de avaliação (Subsubparcelas) e três blocos. A metodologia baseou-se no princípio de que o CO 2 liberado por uma área de solo é absorvido por uma solução de KOH 0,5 N e determinado por titulometria com HCl 0,1 N. A evolução do CO 2 variou ao longo do dia em função dos elementos meteorológicos, principalmente temperatura. A taxa de CO 2 apresentou tendência à maior liberação no final da tarde. Em decorrência da importância da temperatura do solo e do ar nos inúmeros processos que ocorrem no solo, são necessários mais estudos na região semiárida do Brasil.Palavras-chave: Semiárido, Clima e Atividade microbiana. KINETICS OF CARBON DIOXIDE EVOLUTION IN AN AREA OF CAATINGA IN SÃO JOÃO DO CARIRI, PB ABSTRACT -Because of the importance of meteorological variables in different processes that occur in the soil, the objective of this work was to evaluate the kinetics of carbon dioxide evolution (microbial activity) associated with the meteorological elements in areas in

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Atividade microbiana do solo em sistemas agroflorestais, monoculturas, mata natural e área desmatada

Cited by 26 publications

References 19 publications

Humic Haplustox under different land uses in a high altitude environment in the Agreste region of Pernambuco, Brazil

Humic Haplustox under different land uses in a high altitude environment in the Agreste region of Pernambuco, Brazil

Soil CO2 Efflux Measurements by Alkali Absorption and Infrared Gas Analyzer in the Brazilian Semiarid Region

Cinética de evolução de dióxido de carbono em área de caatinga em São João do Cariri-PB

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