Influence of hydrological pathways on dissolved organic carbon fluxes in tropical streams
| Autor: | Weber Friederichs Landim de Souza, Marcelo Friederichs Landim de Souza, Marilane Andrade Pereira, Jéssica Carneiro de Souza, Eline Nayara Dantas da Costa, Daniela Mariano Lopes da Silva |
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| Rok vydání: | 2016 |
| Předmět: |
Wet season
010504 meteorology & atmospheric sciences cacao Water flow Soil science 01 natural sciences Water balance Dissolved organic carbon Organic matter Precipitation Ecology Evolution Behavior and Systematics Original Research organic matter 0105 earth and related environmental sciences Nature and Landscape Conservation chemistry.chemical_classification Hydrology Ecology carbon watersheds 04 agricultural and veterinary sciences Throughfall chemistry 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Atlantic forest Surface runoff |
| Zdroj: | Ecology and Evolution |
| ISSN: | 2045-7758 |
| Popis: | Water flow pathways and water balance are fundamental components for understanding the dynamics of C in the soil/water interface of small basins. The objective of this study was to describe the seasonal variations and estimate the annual balance of dissolved organic carbon (DOC) by comparing two tropical microbasins (preserved forest—PF and cacao plantation—CP). Twenty‐one weekly collections were conducted from September to December 2012 and from April to June 2013. The calculation of the partial balance considered precipitation (P) as inflow and the stream as outflow. The samples were filtered and analyzed using a TOC analyzer. Overall, the DOC was higher CP compared with FP. The behavior of both venues showed that rainy season caused an increase in concentrations in the overland flow (OF) and in the stream, and a decrease in the precipitation (P) and in the throughfall (T). In the CP, the outflow and the soil were chiefly responsible for the high DOC concentrations in the stream, when compared to the PF, which is the result of constant OM decomposition. Soil composition contributes to the control of DOC consumption in each type of soil. The balances were negative in both microbasins, although losses were higher in the AFS (agroforestry systems) when compared to the PF, especially during rainy seasons (−8.98 and −3.05 kg ha−1 year−1, CP and FP, respectively). Thus, the high annual loss of DOC in the CP of the microbasins during the rainy season indicates changes in ecosystem metabolism due to the vegetation cover and to the interactions with the soil. |
| Databáze: | OpenAIRE |
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