Global climate change and soil carbon stocks; predictions from two contrasting models for the turnover of organic carbon in soil

Jones, Chris D.; McConnell, Claire; Coleman, Kevin; Cox, Peter M.; Falloon, Pete; Jenkinson, D. S.; Powlson, D. S.

doi:10.1111/j.1365-2486.2004.00885.x

Cited by 334 publications

(245 citation statements)

References 47 publications

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“…The results of this study confirm the reported Fearnside (2006), providing that a removal Amazonian forest would contribute to a significant feedback, intensifying the greenhouse effect, both by the release of forest biomass carbon (HUNTINGFORD et al, 2004) as by the release of soil carbon (JONES et al, 2005). Despite information of the potential to sequester carbon is faster in the tropics, mainly in vegetation, to a lesser extent, in the surface layers of the soil, the results showed the potential of the soils studied to store carbon.…”

Section: Discussionsupporting

confidence: 80%

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Soil Organic Carbon, Carbon Stock and Their Relationships to Physical Attributes Under Forest Soils in Central Amazonia

et al. 2016

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-The soil carbon under Amazonian forests has an important roles in global changing, making information on the soil content and depths of these stocks are considerable interest in efforts to quantify soil carbon emissions to the atmosphere.This study quantified the content and soil organic carbon stock under primary forest up to 2 m depth, at different topographic positions, at Cuieiras Biological Reserve, Manaus/ ZF2, km 34, in the Central Amazon, evaluating the soil attributes that may influence the permanence of soil carbon. Soil samples were collected along a transect of 850 m on topographic gradient Oxisol (plateau), Ultisol (slope) and Spodosol (valley). The stocks of soil carbon were obtained by multiplying the carbon content, soil bulk density and trickiness of soil layers. The watershed was delimited by using STRM and IKONOS images and the carbon contend obtained in the transects was extrapolated as a way to evaluate the potential for carbon stocks in an area of 2678.68 ha. The total SOC was greater in Oxisol followed by Spodosol and Ultisol. It was found direct correlations between the SOC and soil physical attributes. Among the clay soils (Oxisol and Ultisol), the largest stocks of carbon were observed in Oxisol at both the transect (90 to 175.5 Mg C ha -1 ) as the level of watershed (100.2 to 195.2 Mg C ha -1 ). The carbon stocks under sandy soil (Spodosol) was greater to clay soils along the transect (160-241 Mg C ha -1 ) and near them in the Watershed (96.90 to 146.01 Mg C ha -1 ).Keywords: Carbon; Soil physical properties; Amazonian forest. CARBONO ORGÂNICO DO SOLO, ESTOQUE DE CARBONO E SUA RELAÇÃO COM ATRIBUTOS FÍSICOS SOB SOLOS FLORESTAIS NA AMAZÔNIA CENTRALRESUMO -O carbono do solo sob floresta amazônica tem um papel importante na mudança global, tornando as informações sobre os teores de carbono e profundidades desses estoques são de grande interesse no esforço de quantificar as emissoes de carbono do solo para a atmosfera. Este estudo quantificou os teores e estoques de carbono orgânico do solo sob floresta primária até 2 m de profundidade, em diferentes posições topográficas, na Reserva Biológica do Cueiras, Manaus/ZF2, km34, na Amazônia Central; avaliando-se os atributos do solo que podem influenciar na permanência do carbono no solo. Coletaram-se amostras de solos ao longo de um transecto de 850 m num gradiente topográfico Latossolo (platô), Argissolo (vertente) e Espodossolo (baixio). Os estoques de carbono do solo foram obtidos multiplicando a concentração de carbono pela densidade do solo e espessura de camadas do solo. Delimitou-se uma microbacia hidrográfica através de imagens STRM e IKONOS extrapolando-se os teores de carbono obtidos no transecto como forma de avaliar o potencial de estocagem de carbono em uma área de 2.678,68 ha. O total de COS foi maior no Latossolo seguido

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Section: Discussionsupporting

confidence: 80%

“…The clayey texture or very clayey in depth and distribution of pores cause an accumulate of carbon over the years (JONES et al, 2005;LORENZ;LAL, 2005).…”

Section: Discussionmentioning

confidence: 99%

Soil Organic Carbon, Carbon Stock and Their Relationships to Physical Attributes Under Forest Soils in Central Amazonia

et al. 2016

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“…Consequently, there is a potential for soil C sequestration under bioenergy crops like Miscanthus to play a key role in mitigating some of these losses, but the effects of temperature on decomposition rates (and therefore CO 2 emissions) must also be taken into account. It is worth noting that many models assume decomposition of recent C additions is just as sensitive to temperature as decomposition of older SOM [29][30][31]. However, this is not always accurate [32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Carbon Inputs from Miscanthus Displace Older Soil Organic Carbon Without Inducing Priming

et al. 2016

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The carbon (C) dynamics of a bioenergy system are key to correctly defining its viability as a sustainable alternative to conventional fossil fuel energy sources. Recent studies have quantified the greenhouse gas mitigation potential of these bioenergy crops, often concluding that C sequestration in soils plays a primary role in offsetting emissions through energy generation. Miscanthus is a particularly promising bioenergy crop and research has shown that soil C stocks can increase by more than 2 t C ha −1 yr −1 . In this study, we use a stable isotope ( 13 C) technique to trace the inputs and outputs from soils below a commercial Miscanthus plantation in Lincolnshire, UK, over the first 7 years of growth after conversion from a conventional arable crop. Results suggest that an unchanging total topsoil (0-30 cm) C stock is caused by Miscanthus additions displacing older soil organic matter. Further, using a comparison between bare soil plots (no new Miscanthus inputs) and undisturbed Miscanthus controls, soil respiration was seen to be unaffected through priming by fresh inputs or rhizosphere. The temperature sensitivity of old soil C was also seen to be very similar with and without the presence of live root biomass. Total soil respiration from control plots was dominated by Miscanthus-derived emissions with autotrophic respiration alone accounting for ∼50 % of CO 2 . Although total soil C stocks did not change significantly over time, the Miscanthus-derived soil C accumulated at a rate of 860 kg C ha −1 yr −1 over the top 30 cm. Ultimately, the results from this study indicate that soil C stocks below Miscanthus plantations do not necessarily increase during the first 7 years.

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“…A morte da floresta amazônica contribuiria numa retroalimentação significativa para intensificar o efeito estufa, tanto por liberação de carbono da biomassa da floresta como por liberação de carbono do solo Jones et al, 2005). Isto eleva o espectro do "efeito estufa fugitivo", onde o aquecimento global escapa de controle de humano e continua aumentando independentemente de quaisquer cortes nas emissões antropogênicas que possam ser alcançadas.…”

Section: Retroalimentação Com a Mudança De Climaunclassified

Desmatamento na Amazônia: dinâmica, impactos e controle

Fearnside

2006

Acta Amaz.

187

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RESUMOO desmatamento na Amazônia procede a um alto ritmo por várias razões, muitas das quais dependem de decisões do governo. O desmatamento leva à perda de serviços ambientais, que têm um valor maior que os usos pouco sustentáveis que substituem a floresta. Estes serviços incluem a manutenção da biodiversidade, da ciclagem de água e dos estoques de carbono que evitam o agravamento do efeito estufa. Retroalimentações entre as mudanças climáticas e a floresta, por meio de processos tais como os incêndios florestais, a mortalidade de árvores por seca e calor e a liberação de estoques de carbono no solo, representam ameaças para o clima, a floresta e a população brasileira. Eventos recentes indicam que o desmatamento pode ser controlado, tendo a vontade política, pois os processos subjacentes dependem de decisões humanas. PALAVRAS CHAVEAquecimento global, Biodiversidade, Desmatamento, Carbono, Cíclo hidrológico, Efeito estufa, Serviços ambientais Deforestation in Amazonia: dynamics, impacts and control ABSTRACT Deforestation in Amazonia proceeds at a rapid rate for various reasons, many of which depend on government decisions. Deforestation causes losses of environmental services that are more valuable than the short-lived uses that replace the forest. These services include maintenance of biodiversity, of water cycling and of the stocks of carbon that avoid further intensification of the greenhouse effect. Feedbacks between climatic changes and the forest through such processes as forest fires, tree mortality from drought and heat and the release of carbon stocks in the soil

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Global climate change and soil carbon stocks; predictions from two contrasting models for the turnover of organic carbon in soil

Cited by 334 publications

References 47 publications

Soil Organic Carbon, Carbon Stock and Their Relationships to Physical Attributes Under Forest Soils in Central Amazonia

Soil Organic Carbon, Carbon Stock and Their Relationships to Physical Attributes Under Forest Soils in Central Amazonia

Carbon Inputs from Miscanthus Displace Older Soil Organic Carbon Without Inducing Priming

Desmatamento na Amazônia: dinâmica, impactos e controle

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