Journal of Soils and Sediments

, Volume 15, Issue 4, pp 759–768 | Cite as

Assessment of distribution and sources of pyrogenic carbon in the lower course of the Guadiana River (SW Iberian Peninsula)

  • José M. De la Rosa
  • José M. Martins
  • António Monge Soares
  • M. Fátima Araújo
Impact of Natural and Anthropogenic Pyrogenic Carbon in Soils and Sediments

Abstract

Purpose

The main goal of this work was to determine the pyrogenic carbon (PyC) distribution in surficial sediments for the last 40 km of the Guadiana River (SW Iberian Peninsula). In addition, the changes in the contribution of terrestrial and marine organic matter (OM) sources and their relationship with the PyC contents were assessed.

Materials and methods

Sediments were collected from 22 stations within the lower course of the Guadiana River. All the samples were analyzed for total organic carbon (TOC), total nitrogen (TN), organic carbon to nitrogen atomic ratios (C/N), and stable carbon isotope ratio (δ13C) as indicators of changes in the sources of OM. PyC was determined according to the chemo-thermal oxidation method (CTO-375).

Results and discussion

TOC ranged from 0.25 to 2.37 %dw. The greatest TOC contents were located in sediments collected at the middle estuary. The C/N values ranged from 7.7 to 12.7, with slight relative increase in the marine input compared to pre-Alqueva times. Similar C/N ranges are representative of native soil OM, lacustrine OM, and local sedimentary OM. The δ 13C values of the sediment samples ranged from –25.0 to –27.6 ‰ illustrating a signature of C3 higher plants, marsh-plants, lacustrine plants, and freshwater algae present in the area of study and in the forests located upstream. PyC ranged between 0.17 and 0.74 gkg−1, with the highest contents measured in samples located close to urbanized areas. Sediments collected at the middle estuary, within a rural area, showed the lowest proportions of PyC relative to the percent of TOC (≤4 % TOC). The negative relationship between PyC to TOC ratio and TOC contents confirmed the selective preservation of PyC to degradation in the sedimentary OM of the Guadiana estuary. The carbon isotope composition of the final material after applying the CTO-375 method (hereafter called δ13CPyC) was ˂–30 ‰, suggesting that the PyC fraction was mainly composed of a mixture of fossil fuels and C3-charred biomass. Nevertheless, selective loss of the less recalcitrant OM fractions due to degradation and/or chemical alteration might contribute to lighter carbon isotope values of PyC.

Conclusions

Geochemical data showed that sedimentary OM was composed of a mix of different OM sources, with a slight increase in the marine input after the Alqueva dam went into operation. The PyC content was higher close to urbanized areas of the Guadiana River estuary. The selective preservation of PyC in the sedimentary OM of the Guadiana estuary was observed.

Keywords

Black carbon CTO-375 method Estuaries Recent sediments Refractory organic matter Soot 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • José M. De la Rosa
    • 1
    • 2
  • José M. Martins
    • 2
    • 3
  • António Monge Soares
    • 2
  • M. Fátima Araújo
    • 2
  1. 1.Instituto de Recursos Naturales y Agrobiología de SevillaConsejo Superior de Investigaciones Científicas (IRNAS-CSIC)SevillaSpain
  2. 2.Centro de Ciências e Tecnologias Nucleares, Instituto Superior TécnicoUniversidade de LisboaLisbonPortugal
  3. 3.CIMA, Faculdade de Ciências e Tecnologia, Campus de GambelasUniversidade do AlgarveFaroPortugal

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