Initial Investment in Diversity Is the Efficient Thing to Do for Resilient Forest Landscape Restoration

Abstract

The genetic diversity, quality and suitability of seeds and planting stock is crucial for the short and long-term resilience of restored forest landscapes. However, these genetic aspects are widely neglected during both planning and implementation of restoration. Decisions on seed sourcing during implementation of forest landscape restoration (FLR) initiatives often prioritize short-term cost savings over long-term benefits. Such considerations result in strategies that favor rapid and cheap mass production of homogeneous plants and, thus, quantity over quality, with no regard for genetic diversity. This paper explores in detail the economic cost of improved integration of genetic diversity into restoration projects and tests the assumption that the benefits accruing from better integration of diversity exceed the costs. Using a bottom-up cost model, based on peer reviewed scientific literature, we analyse different FLR cost drivers, integrating genetic quality, in relation to the total costs of a range of tree-based restoration interventions, with a focus on seed sourcing, and tree species selection. The results indicate that the integration of genetic diversity into the management and planning of landscape restoration projects increased the costs incurred at the beginning of FLR interventions, specifically during seed sourcing, and species selection. These additional costs were largely due to the increased effort for the collection of genetically diverse and suitably adapted seed lots. However, despite this initial increase in costs the overall costs of restoration decreased substantially, due to cost savings relating to replacement costs of replanting. Even without these savings, the inclusion of genetic diversity is advisable since the costs involved in the integration of diversity are negligible compared to other restoration costs, such as labor costs related to controlling vegetative competition. We conclude that the expected long-term benefits associated with high genetic diversity far outweigh the costs. It also highlights that investing in genetic diversity as part of FLR is the smart thing to do to ensure cost effective and resilient landscape restoration. Restoration policies need to incentivise consideration of genetic diversity.

Upscaling tropical restoration to deliver environmental benefits and socially equitable outcomes

“…Understanding such variation offers opportunities for climate-smart restoration that avoids climate-mediated setbacks. In addition, climate-smart restoration should invest in multi-species, genetically diverse planting stock and utilise trait-based matching that selects species based on their adaptation to forecasted conditions 15,102 .…”

“…Nevertheless, expensive interventions can yield dividends through time. For instance, high seed-sourcing costs of integrating more genetically diverse tree stock into restoration plantings are offset across the tropics by cost-savings associated with higher survival 102 .…”

Are Tree Seed Systems for Forest Landscape Restoration Fit for Purpose? An Analysis of Four Asian Countries

“…Lack of quality control and failure to integrate genetic diversity and suitability in seed sourcing can have significant consequences for seedling growth, mortality rates and costs of FLR efforts [13,162]. While mechanisms for quality control are lacking in India and Malaysia, the existing regulations in the Philippines are not adequate to provide high-quality seed.…”

How to increase the supply of native seed to improve restoration success: the US native seed development process

“…Successful restoration of degraded ecosystems is fostered by using genetically appropriate seed and other native plant materials (hereafter, “seed”), which are adapted to the environmental conditions and ecological relationships of the restoration site (Johnson et al 2010), and thus are more likely to establish, persist, and support resilient communities (Bucharova et al 2021; Nef et al 2021). However, restoration practitioners often use the most affordable and easily accessible seed (NASEM 2020).…”