Mudança de uso da terra e impacto na matéria orgânica do solo em dois locais no Leste da Amazônia

Signor, Diana

doi:10.11606/t.11.2013.tde-03072013-084639

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…The higher levels of the MF observed in the samples from Planaltina were probably due to the method of separating the organic and mineral fractions in this study, which consisted of separation by flotation in water, unlike the traditional densimetric method of physical fractionation of SOM, in which liquids with higher density than water are used, permitting better separation of these fractions (Deon, 2013). Therefore, a portion of the organic fraction was left behind in the mineral fraction, enriching it with C and causing overestimation of the contents of the MF in the areas evaluated in Planaltina.…”

Section: Carbon In the Granulometric Fractions Of Soil Organic Mattermentioning

confidence: 71%

Soil Organic Matter Quality in Jatropha spp. Plantations in Different Edaphoclimatic Conditions

Freitas

Popin

Milori

et al. 2017

Rev. Bras. Ciênc. Solo

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ABSTRACT:The substitution of native vegetation by agricultural ecosystems can change the quantity and quality of soil organic matter (SOM), and the intensity of these changes depends on the soil type, climate, and land use. The objective of this study was to evaluate the quality of organic matter in chronosequences of Jatropha cultivation in contrasting soil and climatic conditions. Soil samples were evaluated at depths of 0.00-0.10, 0.20-0.30, and 0.80-1.00 m in chronosequences located in Planaltina, Distrito Federal (Cerrado-Pasture-Jatropha), Dourados, Mato Grosso do Sul (Atlantic Forest-Corn-Jatropha), and Araripina, Pernambuco (Caatinga-Jatropha). To assess SOM quality, we determined C contents in the SOM fractions, C stocks, the carbon management index (CMI), the SOM humification index (H LIF ), and the C and N concentrations in the microbial biomass. The conversion of native vegetation to agropastoral systems changed the composition of SOM in the biomes evaluated, especially in the surface layers. The CMI and the C and N contents in the microbial biomass were the most responsive to land use changes in all the biomes studied. The pasture improved SOM quality by increasing the CMI (116) and the C content by 8, 21, and 6 % in the organic, mineral, and organomineral fractions, respectively, while maintaining the SOM humification index and the C and N contents in the microbial biomass in the 0-0.10 m layer. The lowest values of C in the SOM fractions, the CMI (52), and C microbial biomass (136 mg kg -1 ) were observed for annual crops. Jatropha cultivation increased C contents in the SOM fractions, C stocks, the CMI, and C and N in the microbial biomass with an increase in cultivation time, which demonstrates the potential of this long-term system for improving SOM quality.

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Section: Carbon In the Granulometric Fractions Of Soil Organic Mattermentioning

confidence: 71%

Soil Organic Matter Quality in Jatropha spp. Plantations in Different Edaphoclimatic Conditions

Freitas

Popin

Milori

et al. 2017

Rev. Bras. Ciênc. Solo

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“…Conversion of forests into grain farming in the Amazon has promoted changes in soil organic matter stocks (Deon, 2013). Several factors control the dynamic of soil organic matter (SOM), such as climate, soil texture, vegetation type, soil management, besides the amount and quality of plant residues (Silva et al, 2004;Carvalho et al, 2009a;Mascarenhas et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Changes in Carbon Stocks and Chemical Attributes of an Oxisol as a Result of Adoption Period of No-tillage System in the Brazilian Eastern Amazon

Brasil

Dantas

Júnior

et al. 2020

JAS

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The conversion of forest areas to grain cropping has promoted a decrease in soil organic matter stocks in the Amazon. This process is most striking when the conventional cultivation system is used. In order to evaluate the changes in soil carbon and nutrient stocks resulting from the time of adoption of the no tillage system in a dystrophic Yellow Oxisol of the Brazilian Amazon biome, a study was conducted in a grain producing area in the northeastern of Pará, Brazil. The treatments corresponded to the following systems: CT6- conventional tillage system with six years of implementation; No-tillage system with 3 (NT3), 4 (NT4) and 7 (NT7) years of implementation. All systems were always cultivated in corn / soybean rotation. Deformed and non-deformed soil samples were collected on a the 2013 crop year at 0-10, 10-20 and 20-40 cm depths. Stocks of carbon (SC) and phosphorus (P), potassium (K), calcium (Ca) and magnesium (Mg) were calculated by using the equivalent soil mass methodology. Regardless of depth, the NT showed higher SC values than the CT. The adoption of NT showed a tendency of increasing SC of the soil over time. Such increases were up to 36% of the NT7 compared to the CT6. In NT7, the stocks of K, Ca and Mg were higher in relation to PC6. The EC correlated positively with the stocks of K, Ca and Mg in the areas under NT, regardless of the time of system adoption, up to 40 cm deep, indicating improvements in the soil fertility.

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“…O desenvolvimento econômico da região Amazônica está associado principalmente ao agronegócio, atividade que fomentou intensa degradação das áreas de floresta que foram convertidas em áreas de pastagens ou áreas de monocultura agrícolas. Os estados Acre, Rondônia, Pará e Mato Grosso foram as regiões mais afetadas pelo desmatamento e pelas queimadas (DEON, 2013). Até 1980 o desmatamento na Amazônia correspondia a 300 mil km², na década de 1990 cerca de 280 mil km² foram incorporados à esta área e em 2000 a área desmatada já totalizava 732 mil km², o equivalente a quase 15% da Amazônia (BRASIL, 2008).…”

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Influência das matrizes econômicas e sua relação com o clima: município de Porto Velho/RO

Dutra

Lázaro

Hacon

2019

RICA

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O modelo de ocupação populacional e crescimento econômico de Porto Velho - RO foi baseado em incentivos do governo federal através de programas de assentamento. Em 2008, Porto Velho, mais uma vez, foi inserido em programas federais de crescimento econômico, desta vez no Programa de Aceleração do Crescimento (PAC). Tal modelo de desenvolvimento desencadeou mudanças significativas na dinâmica do uso da terra e nos recursos naturais dessa região. Além desses impactos está a emissão de CO2 através das atividades de desmatamento, recuperação de terras, criação de gado e incêndios florestais. Sabendo que o CO2 é um dos principais responsáveis pelo aumento da temperatura do planeta, Porto Velho e região tornam-se potentes contribuintes para o fenômeno das mudanças climáticas. O objetivo deste estudo foi verificar o cenário atual de Porto Velho, do ponto de vista ambiental, econômico, social e climático, com base na análise de indicadores entre 1990 e 2015. A definição de indicadores deu-se a partir da pressão - Estado - Metodologia de resposta (PER). Concluiu-se ao final do estudo, que houve mudança nas variáveis climáticas: temperatura, umidade relativa e precipitação. As análises estatísticas também mostraram fortes associações entre os indicadores de uso da terra e crescimento econômico com o indicador de CO2, e, no entanto, essas mesmas análises não mostraram melhorias significativas na qualidade de vida da população de Porto Velho.

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Mudança de uso da terra e impacto na matéria orgânica do solo em dois locais no Leste da Amazônia

Cited by 3 publications

References 23 publications

Soil Organic Matter Quality in Jatropha spp. Plantations in Different Edaphoclimatic Conditions

Soil Organic Matter Quality in Jatropha spp. Plantations in Different Edaphoclimatic Conditions

Changes in Carbon Stocks and Chemical Attributes of an Oxisol as a Result of Adoption Period of No-tillage System in the Brazilian Eastern Amazon

Influência das matrizes econômicas e sua relação com o clima: município de Porto Velho/RO

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