Restoration and Resilience in Tropical Drylands

Tropical Dry Landscape, Los Santos, Panama

Strategies and Technical Pathways for Tropical Dryland Ecosystem and Landscape Restoration

Sunday, March 29, 2026

Pervez Manan, TRL Fellow, Environmental Leadership & Training Initiative

Drylands cover nearly half of the Earth’s land surface and support significant biodiversity and ecosystem services, yet they are increasingly degraded by human activities and climate change (Perotto-Baldivieso et al., 2025). Restoration in tropical dry forests differs fundamentally from humid tropical systems due to interacting climatic, ecological, and socio-economic constraints. Prolonged dry seasons and high rainfall variability limit seedling establishment and slow recovery, while historical degradation reduces soil fertility and natural regeneration potential. Ecological processes such as succession and species recruitment are therefore highly sensitive to local site conditions. In addition, these landscapes are often fragmented and embedded within human-dominated systems, requiring restoration strategies that integrate ecological goals with livelihood needs and adopt context-specific, adaptive approaches (ELTI, 2019).
Ecological syntheses highlight that many dry forest species regenerate through resprouting, coppicing, and seasonally timed germination, suggesting that assisted natural regeneration often represents a technically appropriate starting point for restoration interventions (Vieira & Scariot, 2006; Lebrija Trejos et al., 2008). Across multiple studies, grazing exclusion, fire management, and the protection of remnant vegetation are identified as key interventions that can restore natural ecological processes and enable recovery without intensive planting. Evidence from farmer-managed natural regeneration initiatives further demonstrates how restoration techniques can operate within agricultural landscapes. Selective stem protection and pruning have been shown to enhance woody cover, soil conditions, and livelihood outcomes while minimizing external inputs (Weston et al., 2015). Complementary economic analyses indicate that passive or assisted regeneration frequently delivers substantial ecosystem service benefits relative to cost, reinforcing the argument that restoration planning should prioritize landscape assessment before implementing large-scale planting programs (Birch et al., 2010). At the same time, research on seed banks and fragmented landscapes suggests that natural regeneration may be constrained where seed sources have been lost, highlighting the need for targeted technical interventions in heavily degraded systems (Skoglund, 1992; Griscom et al., 2011).
Within this context, the framework species (indigenous forest tree species, planted to complement and accelerate natural regeneration of forest ecosystems and encourage biodiversity recovery, on degraded sites (Elliott S. et al., 2003)) method has been described as a catalytic planting strategy rather than a comprehensive reforestation approach. Studies on propagation and germination ecology demonstrate that planting a limited set of fast-establishing native species can initiate canopy development, reduce grass competition, and facilitate subsequent natural succession (Blakesley et al., 2002). Reviews of restoration processes in dry forests similarly describe enrichment planting and underplanting beneath pioneer species as techniques capable of increasing structural diversity where natural recruitment is insufficient (Griscom & Ashton, 2011). Research on silvicultural design further supports the use of diversified planting strategies. Comparative studies of plantation systems indicate that mixed native species plantings may enhance resilience and ecosystem service provision relative to monocultures (Piotto et al., 2004). Functional trait analyses identify nitrogen-fixing species and trees with efficient water use as particularly suitable for degraded dryland environments, providing technical guidance for species selection under conditions of drought and nutrient limitation (Craven et al., 2007). Such findings reinforce the importance of aligning restoration design with site-specific environmental stressors.
Landscape-scale perspectives presented in the literature emphasize the role of remnant trees, riparian corridors, and fragmented forest patches as sources of propagules and in moderating microclimate. Studies from Panama demonstrate that retaining structural legacies within degraded pastures can facilitate natural regeneration and reduce the need for intensive interventions (Griscom et al., 2011). These findings suggest that restoration outcomes are shaped not only by local planting techniques but also by broader landscape configuration and connectivity.
The social and governance dimensions of restoration are also consistently highlighted across studies. Participatory research illustrates that integrating local ecological knowledge into species selection can enhance both ecological relevance and community acceptance of restoration initiatives (Suárez et al., 2012). Investigations of dry forest restoration in Madagascar further demonstrate that tenure systems and livestock management practices influence the feasibility and long-term sustainability of restoration interventions (Randrianasolo et al., 2022). Community-based projects in Panama provide additional examples of how technical training, native species nurseries, and agroforestry integration can support restoration outcomes while generating local economic benefits (Chízmar et al., 2015).
Recent advances in spatial vulnerability mapping strengthen restoration planning by identifying areas exposed to fire, overgrazing, and land conversion, allowing targeted interventions aligned with climate adaptation goals (Fremout et al., 2020). However, monitoring in drylands still relies heavily on vegetation indices such as NDVI, which often fail to capture key features like senescent cover. A shift toward assessing “ecological integrity,” supported by fractional vegetation cover and time-series analyses, offers a more accurate framework (Sutton et al., 2026). Complementing this, satellite and drone-based remote sensing improves the quantification of vegetation recovery and informs restoration strategies (Perotto-Baldivieso et al., 2025). Emerging approaches, such as SAR-optical data fusion using algorithms like Y-Net, further enhance the precision of tropical dry forest mapping, supporting species selection and restoration design (González-Vélez et al., 2026).
Across the literature, restoration is therefore presented not as a single method, but as a continuum of strategies ranging from assisted natural regeneration to targeted planting and landscape-level governance. Together, the body of research suggests that effective restoration of tropical dryland ecosystems relies on integrating ecological processes, silvicultural design, participatory governance, and spatial planning tools. Rather than emphasizing tree planting alone, the literature describes restoration as a process of reactivating ecosystem function through context-specific technical approaches that reflect both environmental constraints and socio-ecological realities.