Journal
ENVIRONMENTAL MONITORING AND ASSESSMENT
Volume 189, Issue 10, Pages -Publisher
SPRINGER
DOI: 10.1007/s10661-017-6228-4
Keywords
Blue carbon; Dead mangrove; Lagoon; Monitoring; Tracemetals; ENSO
Categories
Funding
- project entitled BMonitorizacion dos procesos bioxeoquimicos nas lagoas litorais de Galicia en relacion coa sua calidade ambiental e respuesta ao cambio climatico - Conselleria de Innovacion y Industria-Xunta de Galicia [PGIDIT08MDS036000PR]
- CRETUS strategic group [AGRUP2015/02]
- Fundacion Gran Mariscal de Ayacucho (FUNDAYACUCHO)
- Sao Paulo Research Foundation (FAPESP) [2014/11778-5]
- National Council for Scientific and Development (CNPq)
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Mangrove forests play an important role in biogeochemical cycles of metals, nutrients, and C in coastal ecosystems. However, these functions could be strongly affected by the mangrove soil degradation. In this study, we performed an intensive sampling characterizing mangrove soils under different types of environment (lagoon/gulf) and vegetation (Rhizophora/Avicennia/dead mangrove) in the Venezuelan coast. To better understand the spatial heterogeneity of the composition and characteristics of the soils, a wide range of the soil attributes were analyzed. In general, the soils were anoxic (Eh < 200 mV), with a neutral pH and low concentration in toxic metals; nevertheless, they varied widely in the soil and its quality-defining parameters (e.g., clay contents, total organic carbon, Fe, Al, toxic trace metals). It is noteworthy that the mangroves presented a low Fe-Pyrite content due to a limitation in the Fe oxyhydroxide contents, especially in soils with higher organic C content (TOC > 15%). Finally, the dead mangrove showed significantly lower amounts of TOC and fibers (in comparison to the well-preserved mangrove forest), which indicates that the C pools in mangrove soils are highly sensitive also to natural impact, such as ENSO.
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