Valuing Diversity: What does biodiversity conservation mean for the financial performance of production forests?
How does integrating biodiversity conservation into forests managed for wood production affect their financial performance?
A new study from the TRANSFORMIT project examines this question through a systematic review of the available evidence, exploring where conservation measures create financial trade-offs, where they can generate synergies, and how much the results depend on the way costs and benefits are assessed.
The review has screened a total of 5,305 publications, resulting in the selection of 53 most relevant studies across 15 countries, covering 814 conservation scenarios and a wide range of measures, including longer rotation periods, deadwood retention, habitat and veteran trees, reduced fragmentation, continuous-cover forestry and greater tree species diversity.
What does the evidence show?
What does the evidence show?
Across the studies reviewed, integrating biodiversity conservation into wood-production forests was associated with a slight average reduction in financial performance compared with business-as-usual management. However, the picture is far from uniform. The financial effects varied considerably depending on the conservation measure, forest biome, regeneration system and the assumptions used in the financial models.
Importantly, the review shows that what is included in the financial assessment can substantially change the results. When biodiversity benefits were considered, conservation scenarios were on average 19.7% more financially favourable than business as usual. When such benefits were not included, they were on average 22.2% less favourable.
These benefits can take different forms, including the insurance value associated with more biodiverse and hence resilient forests, improved timber quality or quantity, reduced operational costs and additional income options e.g. through payments for ecosystem services. Such benefits were however only (partially) included in about half of the existing financial assessments.
Trade-offs and potential synergies
The findings also highlight that the financial implications cannot be separated from the specific conservation approach. Some measures, such as deadwood promotion and habitat or veteran tree retention, were frequently associated with financial costs, particularly where they were modelled primarily through reduced timber production or additional management costs without consideration of potential benefits.
Other approaches showed potential for financial synergies under certain conditions. For example, continuous-cover forestry and increased tree species diversity were associated with more favourable financial outcomes in some analyses but not in all.
The review also points to important differences between forest contexts. Conservation measures were associated with more positive financial outcomes in tropical forests, while average effects were more negative in temperate and boreal forests. Similarly, results differed between naturally and artificially regenerating forests, with reduced profitability in former and increased profitability in the latter.
The role of uncertainty
A key message of the review is that financial assessments of biodiversity conservation are strongly shaped by assumptions. All of the included studies relied on modelling, and only around half applied sensitivity analyses to explore uncertainty.
Factors such as discount rates, timber prices, costs, forest growth and disturbances can however substantially influence the results. Climate-related disturbances were explicitly considered in only four of the 53 studies, despite their potential to change the financial implications of different management strategies drastically.
The authors therefore call for more transparent assumptions, broader consideration of biodiversity and ecosystem-service benefits, and more empirical, long-term evidence to complement model-based assessments.
Why this matters for integrated forest management
The study is part of TRANSFORMIT, which explores how forests can be managed to strengthen biodiversity, ecosystem services and resilience while maintaining their capacity to provide wood and other benefits.
The review provides an important evidence base for this work. It shows that biodiversity conservation and wood production cannot simply be understood as opposing objectives: the financial implications depend on the conservation measure, forest context and which costs and benefits are taken into account.
Understanding both trade-offs and synergies is essential for developing more integrated approaches to forest management, as well as policy instruments that support both the use of synergies and the mitigation of trade-offs.