This study presents an analysis of the evolution of the marshes of the Autonomous Community of An... more This study presents an analysis of the evolution of the marshes of the Autonomous Community of Andalusia, Spain, based on information available for 7 specific years: 1956, 1977, 1984, 1998, 2005, 2007 and 2013; analyzing variations in 10 marshlands using orthophotos and cartography available for this community. Overall, this study concludes that 47,008 ha (40%) of the approximately 116.141 ha of marshes in Andalucía in 1956 have been lost until 2013. The loss has occurred at an average rate of 1 - 2% per year, being Doñana (-27,516 ha), Bonanza (-12,069 ha) and San Pedro (-4.454 ha) the marshes most affected. The main causes of regression have been agriculture (75%), industrial salt mines (10%) and urbanization (5%), this reduction also leads to the loss of ecosystem services and atmospheric carbon sequestration; these was estimated using global reference values for CO2 sequestration and CH4 and N2O emissions, 5.54 tCO2-eq ha-1 year-1; 0.3874 tCO2-eq ha-1 year-1; 0.3808 tCO2-eq ha-1 year-1, respectively, published in the scientific literature for polyhaline marsh ecosystems (salinity> 18mg / l). The estimates show a net sequestration capacity between 301 and 199,165 tCO2-eq year-1 in Guadalhorce and Doñana marshes. However, the reduction of the area of the marshes between 1956 and 2013, entailed a loss of sequestration of 224,312.7 tCO2 year-1. Finally, 3,849 ha of soil were identified that could currently be reclaimed as marshes and constitute projects to offset GHG emissions, which can generate an approximate value of 1,495,829 carbon credits, which at the current carbon price (€ 5.27 / US-credit) amounts to approximately € 7,883,022 a year-1.
This study presents an analysis of the evolution of the marshes of the Autonomous Community of An... more This study presents an analysis of the evolution of the marshes of the Autonomous Community of Andalusia, Spain, based on information available for 7 specific years: 1956, 1977, 1984, 1998, 2005, 2007 and 2013; analyzing variations in 10 marshlands using orthophotos and cartography available for this community. Overall, this study concludes that 47,008 ha (40%) of the approximately 116.141 ha of marshes in Andalucía in 1956 have been lost until 2013. The loss has occurred at an average rate of 1 - 2% per year, being Doñana (-27,516 ha), Bonanza (-12,069 ha) and San Pedro (-4.454 ha) the marshes most affected. The main causes of regression have been agriculture (75%), industrial salt mines (10%) and urbanization (5%), this reduction also leads to the loss of ecosystem services and atmospheric carbon sequestration; these was estimated using global reference values for CO2 sequestration and CH4 and N2O emissions, 5.54 tCO2-eq ha-1 year-1; 0.3874 tCO2-eq ha-1 year-1; 0.3808 tCO2-eq ha-1 year-1, respectively, published in the scientific literature for polyhaline marsh ecosystems (salinity> 18mg / l). The estimates show a net sequestration capacity between 301 and 199,165 tCO2-eq year-1 in Guadalhorce and Doñana marshes. However, the reduction of the area of the marshes between 1956 and 2013, entailed a loss of sequestration of 224,312.7 tCO2 year-1. Finally, 3,849 ha of soil were identified that could currently be reclaimed as marshes and constitute projects to offset GHG emissions, which can generate an approximate value of 1,495,829 carbon credits, which at the current carbon price (€ 5.27 / US-credit) amounts to approximately € 7,883,022 a year-1.
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