Eucalyptus, Fire and Fragmented Land: Portugal’s Real Forest Problem

Portugal has the highest share of eucalyptus in its forest area of any European country, and the most damaging wildfire record. The correlation is real and the causation is more complicated than either side of the public argument admits. This analysis separates what is genuinely about the species from what is about ownership structure and land management, because the policy implications are entirely different. It is part of the Portugal Company Stories hub.

Why is Portuguese forest ownership such a problem?

Because it is fragmented to a degree unusual even by European standards. Most Portuguese forest is privately owned, much of it in parcels of a hectare or less, divided further by generations of inheritance among multiple heirs who may live in Lisbon, France or Brazil and have never visited the land.

A meaningful share of the territory has no reliable registration at all. Portugal has run programmes to build a rural property cadastre precisely because, in many municipalities, nobody can say with certainty who owns which plot — which makes enforcement of management obligations nearly impossible.

The economic consequence is decisive. A one-hectare woodlot cannot justify a management plan, fuel clearance, thinning or fire breaks; the cost exceeds any plausible return. Fragmentation therefore produces abandonment automatically, regardless of what species is growing.

What does eucalyptus actually contribute?

A substantial export industry and a genuine fire risk profile. Eucalyptus globulus grows quickly in Portuguese conditions and produces the short fibre that makes Portuguese pulp and paper internationally competitive, supporting one of the country’s larger manufacturing export sectors.

It is also highly flammable. The species carries volatile oils, sheds bark that creates ladder fuels, and can generate ember showers that spread fire ahead of the main front. Under extreme fire weather, eucalyptus stands burn intensely.

The honest position is that both are true. Eucalyptus is economically valuable and increases fire intensity, and Portuguese policy has to price that trade-off rather than pretend it does not exist. Legislation has restricted new eucalyptus planting while permitting replanting of existing areas, which is an attempt to cap the area without destroying the industry.

How much of the fire problem is really about management?

Most of it, according to the way fires actually behave. Fire needs continuous fuel, and continuous fuel results from abandonment: unmanaged undergrowth, no grazing, no clearance, no breaks between stands. Managed plantations with cleared understorey and firebreaks burn very differently from abandoned land of any species.

The rural population decline that produced this is decades old. Grazing animals once cleared undergrowth, small farmers maintained fields between woodlots, and the landscape had natural discontinuities. As the interior emptied, those discontinuities disappeared and the fuel became continuous across whole valleys.

Climate then loaded the system. Hotter, drier, longer summers increase the number of days when fire spreads faster than suppression can respond, which converts an accumulated fuel problem into a catastrophic one. Neither factor alone would produce the outcomes Portugal has experienced.

What has policy actually tried?

Several approaches, with mixed results. Restrictions on new eucalyptus planting, mandatory fuel clearance around buildings and along roads, subsidised forest management associations to aggregate small owners, cadastre programmes to establish ownership, and incentives for native species and mixed stands.

The aggregation approach is the most promising and the slowest. Forest management entities that pool many small parcels under a single professional manager can achieve the scale that individual owners cannot — the same logic that made agricultural cooperatives work — but they require owner consent, which requires finding the owners.

Enforcement is the persistent weakness. Obligations to clear fuel exist; the capacity to inspect hundreds of thousands of small parcels and compel action does not. Rules that cannot be enforced shift risk onto the compliant minority without changing the landscape.

How does this affect the pulp industry?

Directly, through raw material supply and cost. Portuguese pulp producers source eucalyptus from a mix of their own plantations and thousands of small private suppliers, and the availability and price of that wood depend on planting rules, fire losses and the willingness of fragmented owners to manage and harvest.

Companies have responded by integrating backward, owning and managing forest directly, and by certifying supply chains to sustainable forestry standards — which serves both regulatory compliance and customer requirements in export markets.

The longer-term risk is that fire and climate reduce the productive area faster than replanting restores it, tightening fibre supply for an industry whose competitiveness rests on cheap, locally grown, high-quality raw material.

What would actually work?

A combination that no single ministry controls: resolving ownership, aggregating management, restoring economic activity to the interior, and shifting fire spending from suppression toward prevention. Each is necessary and none is sufficient.

The most underrated element is economic. Land is managed when management pays. Grazing, cork, chestnuts, resin, biomass energy, agroforestry and carbon payments all create reasons to maintain land, and a landscape with several income streams is more resilient than one dependent on a single species.

The uncomfortable conclusion is that this is a rural development problem wearing a forestry costume. Portugal’s interior has been losing people for seventy years, and no forest policy will succeed while the underlying question — who lives there and what do they do — remains unanswered. That is the same structural issue running through the labour constraints described across the Portugal hub.

What does the pulp industry own directly?

A meaningful share of Portuguese forest, and it is managed to a standard the fragmented private sector cannot match. Companies including the major pulp producers own and manage plantations directly, with fire prevention infrastructure, access roads, cleared understorey and professional forestry teams.

This creates a visible contrast in the landscape. Company-managed plantations typically have firebreaks, maintained access and controlled undergrowth; adjacent smallholdings frequently have none. When fire moves through both, the difference in behaviour is observable.

Industry has an obvious interest in this. A pulp producer that loses its raw material to fire loses years of growth and faces higher wood costs, so prevention spending is straightforwardly commercial rather than reputational.

Are native species a realistic alternative?

For part of the territory, yes; for the whole of it, no. Cork oak, holm oak, chestnut, pine and native broadleaves all have roles, and mixed stands are more fire-resilient and ecologically valuable than monocultures of any species.

The obstacle is time and money. A cork oak yields no stopper-grade harvest for around four decades, as described in the montado analysis, while eucalyptus can be harvested on roughly a twelve-year rotation. A small owner choosing between them is choosing between an income in twelve years and one in forty.

Without payments for the public goods that slower species provide — fire resilience, biodiversity, water regulation, carbon — the private calculation will keep favouring fast rotation. That is the core policy design question, and it is a financing problem rather than a botanical one.

How do fire losses affect insurance and land value?

Severely, and in ways that compound the abandonment problem. Forest insurance in high-risk areas is expensive or unavailable, so most small owners carry the risk themselves and simply absorb losses when they occur.

An uninsured owner who loses a stand faces a decade or more before the replanted crop generates income, which for an elderly or absentee owner is often the point at which the land is written off entirely and management stops permanently.

The market consequence is that fire risk is capitalised into land values across affected regions, lowering the incentive to invest in exactly the areas where investment in prevention would matter most. Breaking that loop requires either public risk-sharing or aggregation at a scale where risk can be spread internally.

What is the biomass energy angle?

A partial answer to the fuel problem with genuine limits. Converting forest residues and scrub into energy creates an economic reason to clear material that would otherwise accumulate, aligning fire prevention with revenue.

The constraint is logistics. Biomass is bulky and low in value per tonne, so it cannot travel far economically, which means plants must sit close to the resource and the collection radius is small. Fragmented ownership makes assembling reliable supply from many tiny parcels difficult and expensive.

Where it works, it works well: a plant with secure local supply provides steady demand for clearance work and turns a liability into an input. Where supply chains are not organised, biomass capacity ends up importing fuel or running below capacity, which defeats the purpose entirely.

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