Comparação de modelos estatísticos para estimativa da biomassa de árvores, e estimativa do estoque de carbono acima do solo em Cerrado

Oliveira, Camila Paula de; Francelino, Márcio Rocha; Daher, Mayara; Leles, Paulo Sérgio dos Santos; Andrade, Fernando Canto de

doi:10.5902/1980509827065

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…According to Castro and Kauffmam [7], total aboveground biomass (including trees, shrubs, undergrowth, and litter) tends to be smaller as vegetation tends to be less dense. Thus, for this same area, Oliveira et al [26] found values of dry biomass of 10.9 Mg ha −1 , for the arboreal component in the typical savannah.…”

Section: Biomass and Carbon Stocks In The Arboreal Compartmentmentioning

confidence: 55%

Estimation of the aboveground biomass and carbon stocks in open Brazilian Savannah developed on sandy soils

Oliveira

Francelino

Daher

et al. 2019

Carbon Balance Manage

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Background: The Cerrado is the second largest biome in Brazil and the most biodiverse tropical savannah in the world and acts as a great sequester of atmospheric carbon. The lack of studies related to the quantification of its total biomass compromises the understanding of the dynamics of CO 2 in this biome. Thus, it is relevant to develop studies aiming at obtaining accurate estimates of the carbon stock in the different phytophysiognomies that make the Cerrado, to include them in appropriate forest management models. Based on the hypothesis that the amount of carbon stored can vary according to the vegetation typology and vegetation compartments, the aerial stock of dry biomass and carbon were estimated in different compartments (arboreal, herbaceous-shrub and litter). The study was developed in open Brazilian savannah and soils on the sandstone and discussed the effect of fire on this phytophysiognomy. For the arboreal compartment were adjusted mathematical models to fit the biomass equations to estimate the individual stock of the trees in this compartment. The results of the stocks were discussed considering the effect of fire on the phytophysiognomy. Results: Based on the precision and extra distribution measures, the Schumacher-Hall (non-logarithmic) equation presented better results to estimate the individual biomass and carbon stocks of the open Brazilian savannah trees. The aboveground biomass was 12.88 Mg ha −1 , corresponding to a total carbon stock of 5.91 Mg ha −1 , where most of the stocks are in the herbaceous-shrub compartment (44%). The arboreal compartment accounts for the smallest part of the stocks, followed by the litter. Conclusions: The observed values are in the interval verified for other areas of savannah studied in Brazil. The values verified for the open Brazilian savannah in sandy soils are at the lower limit of this range, due to the nutrient-poor nature of this type of soil. The distribution of stocks in the different compartments above the ground points to the fragility of this environment to the random fire effect, common in the region. That shows the need for conservation measures for vegetation maintenance and soil protection to preserve adequate nutrient cycling in the ecosystem.

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Section: Biomass and Carbon Stocks In The Arboreal Compartmentmentioning

confidence: 55%

Estimation of the aboveground biomass and carbon stocks in open Brazilian Savannah developed on sandy soils

Oliveira

Francelino

Daher

et al. 2019

Carbon Balance Manage

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“…According to the Brazilian Soil Classification System, the predominant soils classes are Latossolos and Neossolos ( Fig 1 ), which are strongly associated with the typical vegetation of the Cerrado [ 34 , 45 ]. The Cerrado sensu stricto is the main physiognomy in this region, with low stocks of dry AGB ranging from 9.2 to 12.6 Mg ha -1 [ 46 ].…”

Section: Methodsmentioning

confidence: 99%

Carbon stocks and dynamics of different land uses on the Cerrado agricultural frontier

et al. 2020

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The largest and most dynamic agricultural frontier in Brazil is known as MATOPIBA, an area that covers part of the Cerrado biome. Within this region, Western Bahia stands out as a large producer of soy and cotton. There are no studies that quantify carbon stocks for different land uses and land cover types in Western Bahia, which hinders comprehension of the role of agricultural expansion in carbon dynamics and the development of sustainable agriculture policies. Here, we evaluate how the land use changes in this region have affected the carbon balance in the aboveground biomass (AGB), belowground biomass (BGB), and soil reservoirs. We collected soil samples for areas with different land uses and land cover types to estimate soil carbon stocks (SCS) and combined remote sensing results and modeling techniques to develop a historical reconstruction of spatial patterns of SCS, AGB, and BGB during the period 1990–2018. The replacement of areas from the forest formations class with pasture and rainfed agriculture reduced the 100 cm depth SCS (SCS100) by 37.3% (p = 0.031) and 30.3% (p = 0.053), respectively. By contrast, the conversion of pasture and rainfed agriculture to irrigated agriculture increased SCS100 by 34% (p = 0.034) and 26.5% (p = 0.022), respectively. Spatial changes in historical carbon stocks are strongly associated with land use changes that occurred between 1990 and 2018. We estimated a non-significant loss of 61.9 Tg-C (p = 0.726) from the total carbon stocks (calculated as the sum of AGB, BGB, and SCS) of which 80% of the losses came from soil stocks, 11% from BGB, and 8% from AGB. These findings reveal the need to monitor carbon stocks in sandy soils to reduce the uncertainties of estimates and support the development of effective sustainable agriculture policies. The best alternatives for reducing carbon losses in the Cerrado are to maintain natural forest cover and to recover soils through sustainable soil management, especially in pasturelands where soil carbon stocks are lowest.

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“…Assim, as variações de comportamentos fitofisionômicos ordenam o nível de estabilidade da formação, além de garantir a estabilização do ambiente e condições de estoque e fixação de carbono, constituindo assim, uma relação de co-dependência entre a estabilização do carbono e a estabilização do ambiente (Costa et al, 2018;Creevy et al, 2020). Reconhecer padrões específicos de vegetação e o levantamento de variáveis e informações indispensáveis às práticas de manejo sustentável é imprescindível para alcançar medidas de conservação para o bioma tão ameaçado como o Cerrado (Oliveira et al, 2019).…”

Section: Pereiraunclassified

Fluxo de CO2 e os Índices de Vegetação do Parque Nacional das Nascentes do Rio Parnaíba, Piauí, Brasil

Pereira¹,

Nunes²,

Rocha³

et al. 2020

Rev. Bras. Geog. Fis.

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As emissões dos gases de efeito estufa na atmosfera trazem consequências para o meio ambiente e saúde pública. Logo, ambientes naturais, como as Florestas Nativas do Cerrado são essenciais no processo de equilíbrio de carbono, pela fixação do mesmo. Com o objetivo estimar o fluxo de CO2 com base em diferentes índices de vegetação do Parque Nacional das Nascentes do Rio Parnaíba (PNNRP), essa pesquisa, utilizou-se dos seguintes índices: Pré Processamento das Imagens (PPI), Índice de Vegetação por Diferença Normalizada – NDVI, Índice de Vegetação Fotossintético – PRI, Índice de Vegetação Ajustado ao Solo – SAVI, Índice de Área Foliar- IAF e CO2FLUX. Referente ao Índice de Vegetação por Diferença Normalizada (NDVI), verificou-se que a maior parte da área PNNRP se encontra sob a vegetação considerada densa, sendo os valores de SAVI encontrados próximos aos valores de NDVI, que pode estar relacionado a uma boa cobertura vegetal presente, indicando pouca influência das características do solo sob os índices de vegetação. A partir dos resultados encontrados através do IAF do PNNRP verificou que em áreas que os valores são maiores encontram-se as vegetações com o melhor desenvolvimento. Levando em conta os valores relacionados ao CO2Flux, IAF, NDVI e os demais índices, percebeu-se a capacidade do Parque no aproveitamento da luz solar e a realização da fotossíntese, além de abrigar uma vegetação saudável, podendo assim afirmar o grande potencial do PNNRP em armazenar carbono. Portanto, evidencia-se que o Parque Nacional das Nascentes do Rio Parnaíba possuí uma alto potencial de fluxo de carbono. CO2 flow and vegetation indices of the Parque Nacional das Nascentes do Rio Parnaíba, Piauí, Brazil A B S T R A C TEmissions of greenhouse gases into the atmosphere have consequences for the environment and public health. Therefore, natural environments, such as the Cerrado's Native Forests are essential in the carbon balance process, due to its fixation. With the objective of estimating the CO2 flow based on different vegetation indexes of the Nascentes do Rio Parnaíba National Park (PNNRP), this research used the following indexes: Pre-Processing of Images (PPI), Vegetation Index by Difference Normalized - NDVI, Photosynthetic Vegetation Index - PRI, Soil Adjusted Vegetation Index - SAVI, Leaf Area Index - IAF and CO2FLUX. Regarding the Index of Vegetation by Normalized Difference (NDVI), it was found that most of the PNNRP area is under dense vegetation, with SAVI values found close to NDVI values, which may be related to good coverage present, indicating little influence of soil characteristics on vegetation indexes. From the results found through the IAF of the PNNRP verified that in areas with higher values are the vegetation with the best development. Taking into account the values related to CO2Flux, IAF, NDVI and other indexes, the Park's capacity to use sunlight and photosynthesis was observed, as well as to house healthy vegetation, thus confirming the great potential of PNNRP in storing carbon. Therefore, it is evident that the Parnaíba River National Park has a high carbon flow potential.Keywords: biomass, cerrado biome, carbon flow

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Comparação de modelos estatísticos para estimativa da biomassa de árvores, e estimativa do estoque de carbono acima do solo em Cerrado

Cited by 5 publications

References 5 publications

Estimation of the aboveground biomass and carbon stocks in open Brazilian Savannah developed on sandy soils

Estimation of the aboveground biomass and carbon stocks in open Brazilian Savannah developed on sandy soils

Carbon stocks and dynamics of different land uses on the Cerrado agricultural frontier

Fluxo de CO2 e os Índices de Vegetação do Parque Nacional das Nascentes do Rio Parnaíba, Piauí, Brasil

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