Environmental impact assessment on mangrove seedling morphometry by crude oil
DOI:
https://doi.org/10.35197/rx.08.02.e.2012.08.grKeywords:
oil, vegetation, mangroveAbstract
A study was conducted to examine the cumulative effects after an oil spill and to assess the impact of oil on a typical zoning with seedlings of Rhizophora mangle, Laguncularia racemosa and Avicennia germinans under controlled conditions of ambient temperature, humidity, hydroperiod, salinity and microtopography in a greenhouse. It is relevant to mention that this study had a stabilization phase of 40 days and then the oil spill was carried out on the experiment which lasted 183 days; The negative effects found in the three species mentioned above have been located in terms of height and diameter increase, presenting lower diameter rates in the DCPC (0.0043, 0.0037 and 0.0031 mm/day), compared to the DT (0.067, 0.0052 and 0.0044 mm/day). Where the greatest effect was observed in Rhizophora mangle presenting a decrease in diameter growth, due to the immediate impact and the longer residence time of the crude oil.
In the case of height growth, the effects of the oil were more evident for Rhizophora mangle decreasing by 50% and in Avicenniagerminans by 58%, compared to the reference seedlings. This last species is affected due to the concentration of the hydrocarbon in the sediment by percolation, stimulated by the lower amplitude and frequency of flooding, evidenced by the increase in alkalinity in the sediment, derived from the hydrophobicity of petroleum compounds, in Rhizophora mangle and Avicennia germinas (8.1 ± 0.04 and 8.4 ± 0.47), unlike DT (5.8 ± 0.4 and 7.0 ± 0.2).
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Copyright (c) 2012 G.C. Requena Pavón, C. M. Agraz Hernández, A. Vazquez Botello, J. Osti Saénz, J.E. Reyes Castellanos , C. Chan Keb , C. García Zaragoza
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