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Serviços dos ecossistemas providenciados pelo arvoredo urbano da cidade de Loulé
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Abstract(s)
As árvores urbanas são elementos estruturantes das cidades, cujo valor em serviços providenciados é geralmente desconhecido e não tem sido considerado na gestão da arborização pública. As árvores proporcionam diversos benefícios ao ser humano, quer sejam ecológicos, ambientais, sociais, económicos, culturais ou simbólicos. A quantificação dos serviços dos ecossistemas (SE) vai ao encontro do estabelecido no Decreto-lei nº. 59/2021 de 18 de agosto, o qual irá permitir uma melhor gestão do arvoredo urbano na cidade de Loulé.
O presente trabalho tem como objetivo quantificar os SE providenciados pelo arvoredo urbano da cidade de Loulé. Com isto carateriza e identifica os benefícios associados ao arvoredo urbano de Loulé e as suas freguesias de São Clemente e São Sebastião.
Foi recolhido um conjunto de dados em campo (PAP, altura, diâmetros e saúde de copa, alturas, entre outros), de uma amostra de arvoredo de arruamento com 1003 árvores, e posteriormente utilizada a ferramenta i-Tree, para a quantificação dos benefícios do arvoredo urbano.
A partir dos resultados da amostra, submetidos ao i-Tree, foram apresentados os SE do arvoredo urbano da cidade de Loulé (armazenamento de C, sequestro bruto de C, produção de oxigénio, remoção de poluentes, escoamento superficial evitado, eficiência energética). Por fim, os resultados foram extrapolados para o total de árvores de arruamento existentes em Loulé.
Para as 1003 árvores de arrumamento amostradas estima-se o armazenamento de carbono em 105,67 toneladas (12800,00 €), o sequestro anual de carbono em 8,68 toneladas (2050,63 €/ano), a produção de oxigénio em 23,14 toneladas, a remoção de poluentes em 184,10 kg (177,0€), o escoamento superficial evitado em 36,1m3 (431,3€) e a poupança energética em 786€. Estes benefícios resultam num total de valor de substituição estimado em 825396,51 €.
Urban trees are structuring elements of cities, whose value in services provided is generally unknown and has not been considered in the management of public tree planting. Trees provide various benefits to humans, ecological, environmental, social, economic, cultural, or symbolic. The quantification of ecosystem services (ES) meets the established in Decree-Law no. 59/2021 of August 18, which will allow better management of urban tree planting in the city of Loulé. This work aims to quantify the ES provided by the urban tree canopy of the city of Loulé. With this, it characterizes and identifies the benefits associated with the urban tree canopy of Loulé and its parishes of São Clemente and São Sebastião. A set of data was collected in the field (CBH, height, diameters and crown health, heights, among others), from a sample of street tree planting with 1003 trees, and subsequently used the i-Tree tool for quantifying the benefits of urban tree planting. From the results of the sample submitted to i-Tree, the ES of the urban tree canopy of the city of Loulé were presented (C storage, gross C sequestration, oxygen production, pollutant removal, avoided runoff, energy efficiency). Finally, the results were extrapolated to the total number of street trees existing in Loulé. For the 1003 sampled street trees it is estimated carbon storage at 105,67 tons (€12800,00), annual carbon sequestration at 8,68 tons (€2050,63/year), oxygen production at 23,14 tons, pollutant removal at 184,10 kg (€177,0), avoided runoff at 36.1m3 (€431,3) and energy savings at €786. These benefits result in a total estimated replacement value of €825396,51.
Urban trees are structuring elements of cities, whose value in services provided is generally unknown and has not been considered in the management of public tree planting. Trees provide various benefits to humans, ecological, environmental, social, economic, cultural, or symbolic. The quantification of ecosystem services (ES) meets the established in Decree-Law no. 59/2021 of August 18, which will allow better management of urban tree planting in the city of Loulé. This work aims to quantify the ES provided by the urban tree canopy of the city of Loulé. With this, it characterizes and identifies the benefits associated with the urban tree canopy of Loulé and its parishes of São Clemente and São Sebastião. A set of data was collected in the field (CBH, height, diameters and crown health, heights, among others), from a sample of street tree planting with 1003 trees, and subsequently used the i-Tree tool for quantifying the benefits of urban tree planting. From the results of the sample submitted to i-Tree, the ES of the urban tree canopy of the city of Loulé were presented (C storage, gross C sequestration, oxygen production, pollutant removal, avoided runoff, energy efficiency). Finally, the results were extrapolated to the total number of street trees existing in Loulé. For the 1003 sampled street trees it is estimated carbon storage at 105,67 tons (€12800,00), annual carbon sequestration at 8,68 tons (€2050,63/year), oxygen production at 23,14 tons, pollutant removal at 184,10 kg (€177,0), avoided runoff at 36.1m3 (€431,3) and energy savings at €786. These benefits result in a total estimated replacement value of €825396,51.
Description
Keywords
Árvores urbanas Árvores de arruamento I-tree Sequestro de carbono Armazenamento de carbono Produção de oxigénio Valorização dos serviços dos ecossistemas