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Summary
DescriptionImpact of elevated CO2 on soil carbon reserves-es.png |
Español: Figura 1 Efectos previstos del dióxido de carbono elevado (eCO2) en las reservas de carbono del suelo. A corto plazo, el crecimiento de las plantas se ve estimulado por el eCO2, lo que provoca un aumento de la rizodeposición, estimula a los microbios a mineralizar el carbono orgánico del suelo (SOC) y añade CO2 a la atmósfera a través de la respiración. Pero el impacto neto sobre las emisiones de gases de efecto invernadero se verá reducido por el aumento de la absorción de CO2 de la atmósfera debido al mayor crecimiento de las plantas. Sin embargo, a largo plazo, las reservas de carbono de fácil descomposición del suelo se agotarán por el aumento de la actividad microbiana, lo que provocará un mayor catabolismo de las reservas de SOC, aumentando así las concentraciones atmosféricas de CO2 por encima de lo que absorben las plantas. Se prevé que esto sea un problema particular en el permafrost que se está descongelando y que contiene grandes reservas de SOC que son cada vez más susceptibles a la degradación microbiana a medida que el permafrost se descongela (195, 196).
English: Figure 1 Predicted effects of elevated carbon dioxide (eCO2) on soil carbon reserves. In the short term, plant growth is stimulated by eCO2, resulting in increased rhizodeposition, priming microbes to mineralize soil organic carbon (SOC) and adding CO2 to the atmosphere through respiration. But the net impact on greenhouse gas emissions will be reduced by the increased uptake of CO2 from the atmosphere by increased plant growth. However, over the long term, soil reserves of easily decomposed carbon will be depleted by the increase in microbial activity, resulting in increased catabolism of SOC reservoirs, thus increasing atmospheric CO2 concentrations beyond what is taken up by plants. This is predicted to be a particular problem in thawing permafrost that contains large reserves of SOC that are becoming increasingly susceptible to microbial degradation as the permafrost thaws (195, 196). |
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Source | Commons File:Impact of elevated CO2 on soil carbon reserves.gif |
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Dan Naylor,1 Natalie Sadler,1 Arunima Bhattacharjee,2 Emily B. Graham,1,3 Christopher R. Anderton,2 Ryan McClure,1 Mary Lipton,2 Kirsten S. Hofmockel,1,4 and Janet K. Jansson1
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