Abstract
Maintaining a diverse urban forest that provides ecosystem services can promote urban sustainability and resilience to environmental change. Around the world, cities have taken to inventorying their urban trees and quantifying their ecosystem services but more so in industrialized counties than in Latin America. Here we describe the results of an i-Tree inventory that established 206 survey plots in the National Municipal District of Santo Domingo (NMDSD). We used social-ecological theory to evaluate potential factors that may influence urban forest structure, composition, and ecosystem services diversity across three wards with distinct social and urban characteristics. Rarefaction curves showed a diverse urban forest dominated by non-native trees that have ornamental and medicinal uses. Wards differed in species composition with palms being particularly dominant in Wards 1 and 2 where the proportion of low-income houses is smaller. Ward 1 supports high-income residential areas and Ward 3 is the area with higher population and housing densities and lower income residents. On average, we found no significant differences among wards in tree species richness, average dbh, leaf area, and percent tree cover per plot. Trees in Ward 2 were taller, on average, than those in Ward 1 but were comparable to those in Ward 3. Likewise, tree density per plot was highest in Ward 2, followed by Ward 1 and Ward 3. Despite these significant differences in stem densities, average values in four ecosystem services involving measures of carbon, rainfall, and contaminants (C-sequestration, C-storage, avoided runoff, and removal of air pollutants) were non-significant across wards. We found disproportionately more street trees in Ward 1 relative to Wards 2 and 3 and more trees in public spaces in Wards 1 and 2 relative to Ward 3. Evidence for the luxury effect on tree distribution in the NMDSD was subtle and manifested mostly through differences in species composition and tree distribution across public and private domains as well as the amount of planting space. Overall results point to inequalities in the potential of reforestation among NMDS wards and an overabundance of non-native species, which should guide urban forest management with ecosystem services and conservation goals.
Highlights
Maintaining a network of biodiverse urban trees that ensures the provision of critical ecosystem services for current and future generations is a key element of the sustainability discourse
This study was undertaken in the National Municipal District of Santo Domingo, capital of Dominican Republic with a population of 965,040 (Figure 1C) and located in the southeastern region of the island [Oficina Nacional de Estadísticas (ONE), 2010]
The results presented here contribute to the growing body of research that investigates the factors that drive urban forest quality and quantity of cities in LAC (Latin America and the Caribbean)
Summary
Maintaining a network of biodiverse urban trees that ensures the provision of critical ecosystem services for current and future generations is a key element of the sustainability discourse. This vision has been advocated in a variety of policy arenas (Millenium Ecosystem Assessment, 2005; Benedict and McMahon, 2012; United Nations, 2015; Intergovernmental Platform on Biodiversity and Ecosystem Services (IPBES), 2019). Many cities around the world have begun quantifying tree benefits (i.e., ecosystem services) to increase their adaptive capacity and resilience (McPhearson, 2014). These ecosystem service approaches have been less studied in Latin American cities, relative to cities located in Europe and North America (Vihervaara et al, 2010; McPhearson et al, 2016; Dobbs et al, 2019; Ordoñez-Barona et al, 2020)
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