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- Title
Carbon dynamics in small tropical catchments under preserved forest and cacao agroforestry systems.
- Authors
da Costa, Eline Nayara Dantas; de Souza, Jéssica Carneiro; Pereira, Marilane Andrade; de Souza, Marcelo F. Landim; de Souza, Weber F. Landim; da Silva, Daniela Mariano Lopes
- Abstract
Inland waters such as streams that receive carbon from terrestrial landscapes usually have a net heterotrophic metabolism and emit significant amounts of CO2 to the atmosphere. This research aims to analyze the role of hydrological routes to transport the dissolved inorganic carbon (DIC) and pCO2 concentration in stream water and describe their dynamics by comparing two small catchments under tropical preserved forest (TPF) and cacao agroforestry system (CAS) during distinct rainfall regimes. The sampling occurred weekly (for twenty-one weeks) from September to December 2012 and from April to June 2013. The pCO2 in stream water (SW) was calculated using total alkalinity and pH data. The DIC of soil solution (SS) and surface runoff (SR) were measured through a TOC analyzer. The SS and SR have different patterns of influence on the DIC concentrations in the streams. The DIC concentrations were higher in CAS than in TPF. The pCO2 in CAS was eight and sixteen times higher than TPF in dry and rainy periods, respectively. Fluxes in both areas were significantly elevated during the rainy period compared to the dry period. DIC fluxes were higher in CAS than TPF during both periods (CAS: 1.72 and 19.1 kg ha−1 year−1 and TPF: 0.10 and 2.82 kg ha−1 year−1 to dry and rainy periods, respectively). Based on these results and previous studies involving C fluxes, it is possible that the cacao agroforestry system promotes changes in stream water metabolism, considerably raising pCO2 and DIC concentrations, probably owing to organic matter created by cacao vegetation without management.
- Subjects
AGROFORESTRY; CACAO; VEGETATION management; TROPICAL forests; SOIL solutions; CARBON; WATERSHEDS; SOIL dynamics
- Publication
Agroforestry Systems, 2021, Vol 95, Issue 8, p1647
- ISSN
0167-4366
- Publication type
Article
- DOI
10.1007/s10457-021-00671-1