Taxa de decomposição da serapilheira e atividade microbiana em área de Caatinga

Souto, Patrícia Carneiro; Souto, Jacob Silva; Santos, Rivaldo Vital dos; Bakke, Ivonete Alves; Sales, Francisco das Chagas Vieira; Souza, Bruna Vieira de

doi:10.1590/s0104-77602013000400005

Cited by 23 publications

(20 citation statements)

References 13 publications

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“…Na área de RC, esses valores são medianos, estando entre as outras duas áreas, enquanto que na área de MR, encontraram-se altos níveis de COT e MOS, apresentando a área mais superficial com maior abundância dos compostos, contudo a sua respiração foi a mais baixa entre as áreas estudadas. Uma parte do carbono dos resíduos é liberada para a atmosfera como CO 2 e o restante passa a fazer parte da MOS (SOUTO et al, 2013).…”

Section: Resultsunclassified

Efluxo de CO2, atributos físicos e carbono do solo em manejos agroecológicos

Costa

Souza

et al. 2017

Revista Verde

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A avaliação de atributos solo em sistemas agroecológicos é de fundamental importância para verificar os benefícios desse tipo de manejo. Objetivou-se avaliar as características físicas, o efluxo de CO2 e o carbono orgânico em diferentes condições de manejo. A área de pesquisa pertence à Unidade de Serviços de Tecnologia alternativa, localizada na cidade de Glória do Goitá, Pernambuco, que desenvolve técnicas com base nos princípios agroecológicos, visando o desenvolvimento sustentável no ambiente rural. Três áreas foram selecionadas: Permacultura, Rotação de Cultura e Mata em Regeneração. Para cada uma das áreas foram coletadas amostras de solo deformadas e indeformadas, em duas profundidades 0-20 e 20-40 cm. As variáveis analisadas foram: granulometria, densidade e porosidade do solo, Carbono Orgânico Total (COT) e calculada a Matéria Orgânica do Solo (MOS). Realizou-se também a medição do efluxo de CO2 do solo, utilizando uma câmara específica para solo acoplada ao IRGA, modelo 6400XT. Os resultados foram analisados pela comparação de médias utilizando o teste de Scott-Knot a uma probabilidade de 5%. A permacultura e a rotação de cultura apresentaram valores de atributos físicos que se aproximaram da condição de mata. Com relação aos teores de Carbono e MOS, a área de mata obteve as maiores médias, enquanto que para o efluxo de CO2, as áreas manejadas obtiveram médias superiores, demonstrando os benefícios destes manejos para a melhoria da qualidade do solo.CO2 efflux, physical attribute and soil carbon in agro-ecological management systems Abstract: Evaluation of soil in agroecological systems is of fundamental importance to check the influence of this type of soil management. The aim of this study is to evaluate the physical, CO2 efflux and the carbon in different management conditions. The survey area belongs to Alternative Technology Services Unit, located in Gloria do Goitá, Pernambuco, which develops techniques based on agro-ecological principles for sustainable development in the rural environment. Three areas were selected: Permaculture, Culture rotation and Forest in regeneration, for each of the areas disturbed and undisturbed soil samples were collected from two layers 0-20 and 20-40 cm. The variables analyzed were: grain size, density, soil porosity, Total Carbon (TC) and Soil Organic Matter (SOM). It was also performed measuring the soil CO2 efflux, using a specific camera to soil coupled to Irga 6400XT. The results were analyzed by comparison of means using the Scott-Knot test at a probability of 5%. The permaculture and crop rotation had physical attributes values that approached the forest condition. With respect to C and MOS levels, the forest area had the highest averages, while for soil CO2 efflux, the areas managed obtained higher averages, demonstrating the benefits of these managements to improve soil quality.

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Section: Resultsunclassified

Efluxo de CO2, atributos físicos e carbono do solo em manejos agroecológicos

Costa

Souza

et al. 2017

Revista Verde

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“…The rainfall in these regions presents great variability, so it is important to monitor the atmospheric conditions and the soil water content, thus evaluating the litter decomposition process present in these local (Souto et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Synchronism of Production and Degradation of Litter in Fragment of Dry Tropical Forest in Paraiba, Brazil

Morais¹,

Souto²,

Justino³

et al. 2019

JAS

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The litter is an important way of returning the organic matter to the soil, through the cycling of the nutrients, aiding in the development of the vegetation present in the ecosystems. The study aimed to estimate the spatio-temporal variation of deposition, accumulation and decomposition of the litter present in the preserved caatinga vegetation, located in the RPPN Fazenda Tamanduá in Santa Terezinha-PB, Brazil and the interference of climatic variables in the dynamics of these events. The research was conducted at RPPN Fazenda Tamanduá, in Santa Terezinha-PB, Brazil. The deposition of litter on 20 collectors of 1.0 m × 1.0 m was collected monthly in two periods: period I (August/2015 to July/2016) and period II (August/2016 to July/2017), the collected material was separated into leaves, branches + barks, reproductive and miscellaneous fractions. To estimate the rate of decomposition the litter accumulated on the forest floor was quantified using a 0.5 m × 0.5 m metal frame. The deposition of the total litter in periods I and II was 2,356.83 kg ha-1 and 1,163.67 kg ha-1, respectively. The leaf fraction was the one that contributed the most during the two collection periods. The analysis of the data allowed to conclude that the total litter deposition in the two periods is in line with the average production for the Caatinga. The increase in precipitation provided higher deposition of litter after the rainy season. Due to several factors, the decomposition of litter in the caatinga is slower than in other biomes.

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“…There were many variations in the concentrations of elements in the different localities and also in the months collected, showing that there is no well-defined behavior for these elements in the analyzed samples. According to Souto et al, 38 these large variations are associated with the presence of different species, with different ages, and also to changes in edaphoclimatic conditions. For Schumacher et al, 39 the nutrient content in plant litter may vary, even for the same species, depending on the site, the characteristics of the plant and the element properties.…”

Section: Metals Contribution By Plant Littermentioning

confidence: 98%

Concentration of Metals in Plant Litter Produced in Regions of Caatinga in Southwest Bahia, Brazil

Lima

Gomes

Cerqueira

et al. 2020

J. Braz. Chem. Soc.

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Plant litter has several functions in a forest ecosystem. Studies about plant litter are of great importance to better understand and conserve ecological environments. The objective of this study was to investigate the concentration of metals (Fe, Co, Ca, Cu, Ni, Mg, Mn and Zn) in Caatinga plant litter in the southwest region of Bahia. Plant litter was collected in summer (January/2017) and winter (August/2017). Concentrations were determined by flame atomic absorption spectrometry (FAAS). The results were submitted to multivariate analysis, principal component analysis (PCA), and hierarchical cluster analysis (HCA). The average amount of plant litter found in January and August was 1190 and 1329 kg ha -1 , respectively. The twigs fraction provided the largest amount of biomass to the plant litter since this deposition occurred in greater quantity in August, a period of drought. Metal concentrations (g kg -1 ) in the analyzed samples ranged from 1.39-257 (Fe), < limit of quantification (LOQ)-0.269 (Co), 0.0036-0.61 (Cu), 1.39-8.76 (Ca), 0.0022-0.56 (Ni), 0.137-1.52 (Mg), 0.033-1.91 (Mn) and 0.0022-0.8 (Zn). The multivariate analysis showed that the composition of plant litter is altered seasonally.

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Taxa de decomposição da serapilheira e atividade microbiana em área de Caatinga

Cited by 23 publications

References 13 publications

Efluxo de CO2, atributos físicos e carbono do solo em manejos agroecológicos

Efluxo de CO2, atributos físicos e carbono do solo em manejos agroecológicos

Synchronism of Production and Degradation of Litter in Fragment of Dry Tropical Forest in Paraiba, Brazil

Concentration of Metals in Plant Litter Produced in Regions of Caatinga in Southwest Bahia, Brazil

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