The impact of fast-growing eucalypt plantations on C emissions in tropical soil: effect of belowground and aboveground C inputs.
Environ Monit Assess
; 196(1): 102, 2023 Dec 29.
Article
en En
| MEDLINE
| ID: mdl-38158434
ABSTRACT
Planted forest soils can have great potential for CO2-C sequestration, mainly due to belowground C inputs, which impact deep soil C (DSC) accumulation. However, there are still gaps in understanding the CO2 emission dynamics in eucalypt plantations. Therefore, we used isotopic techniques to investigate the dynamics of the soil surface CO2-C flux and CO2-C concentration with depth for a eucalypt plantation influenced by different C inputs (above- and belowground). The gas evaluations were carried in depth the root to valuation of root priming effect (RPE) was calculated. In addition, measurements of the plant (C-fine root and C-litterfall) and soil (total organic carbon - TOC, total nitrogen - TN, soil moisture - SM, and soil temperature - ST) were performed. After planting the eucalypt trees, there was an increase in the soil surface CO2-C flux with plant growth. Root growth contributed greatly to the soil surface CO2-C flux, promoting greater surface RPE over time. In comparison to the other factors, SM had a greater influence on litterfall decomposition and root respiration. It was not possible to detect losses in TOC and TN in the different soil layers for the 31-month-old eucalypt. However, the 40-month-old eucalypt showed a positive RPE with depth, indicating possible replacement of DSC ("old C") by rhizodeposition-C ("new C") in the soil. Thus, in eucalyptus plantations, aboveground plant growth influences CO2 emissions on the soil surface, while root growth and activity influence C in deeper soil layers. This information indicates the need for future changes in forest management, with a view to reducing CO2 emissions.
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Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Suelo
/
Dióxido de Carbono
Idioma:
En
Revista:
Environ Monit Assess
/
Environ. monit. assess
/
Environmental monitoring and assessment
Asunto de la revista:
SAUDE AMBIENTAL
Año:
2023
Tipo del documento:
Article
País de afiliación:
Brasil
Pais de publicación:
Países Bajos