What drives productive value in timberland
Timberland productive value is determined by a single variable above all others: the Mean Annual Increment (MAI) achievable on the specific site. MAI — expressed in m³/ha/year — is the average timber volume produced per hectare per year over the rotation period. It determines gross revenue at harvest and therefore NPV and IRR for the entire investment.
The same species on two adjacent sites can have MAIs that differ by 3×. Eucalyptus on an optimal deep-soil site in southern Brazil achieves 35-45 m³/ha/year. The same species on a shallow or poorly drained site 50km away may produce 12-15 m³/ha/year. At the same timber price and the same establishment cost, the NPV difference between those two outcomes is enormous — and it is determined entirely by site quality, not by management intensity.
The three site factors that determine MAI
- Effective soil depth: most commercial plantation species need more than 80-100 cm of unrestricted rooting depth. A shallow or compacted horizon at 40-50 cm is a structural MAI constraint.
- Annual rainfall and dry season severity: each species has a minimum annual rainfall below which growth slows significantly, and a dry season length above which water stress limits MAI. The drought year (p10 rainfall) — not the average — is the relevant parameter.
- Temperature and frost: tropical species (teak, eucalyptus clones) have low frost tolerance. Temperate species (pine, poplar) require winter dormancy. Planting a tropical species outside its frost-free zone is an investment-ending error.
Species by investment profile
| Species | Rotation | MAI range | Primary use | Risk profile |
|---|---|---|---|---|
| Eucalyptus | 6–10 yr | 20–45 m³/ha/yr | Pulp, biomass, poles | Low: large established market, short payback |
| Pine (P. taeda, P. elliottii) | 14–20 yr | 18–30 m³/ha/yr | Solid wood, pulp, resin | Medium: longer rotation, multiple markets |
| Teak | 20–30 yr | 8–18 m³/ha/yr | Premium hardwood, export | High: long rotation, price volatility, site sensitivity |
| Poplar | 10–15 yr | 15–25 m³/ha/yr | Panels, packaging timber | Medium: requires water access or irrigation |
Discount rate sensitivity: why it matters in forestry
Timber plantation cash flows have a distinctive profile: costs concentrated in early years, revenue concentrated at harvest. This makes NPV highly sensitive to the discount rate. A eucalyptus project with 10-year rotation that shows NPV = +USD 1,800/ha at a 6% discount rate may show NPV = -USD 200/ha at a 9% discount rate — the same project, the same MAI, the same timber price. Always verify which discount rate was used in any presented financial projection.
Due diligence for timberland in Latin America
A complete timberland due diligence covers site quality, market access, legal and regulatory framework, and financial projections with sensitivity analysis.
- Site assessment: soil profile to 1m depth, effective rooting depth, drainage, pH. Climate history: annual rainfall mean and drought year, temperature range and frost frequency. Compare with species requirements.
- MAI benchmarking: obtain site-comparable MAI data from operational plantations in the region. Do not accept projections based on optimal-site MAI applied to an unverified site.
- Market access: identify the nearest buyer (pulp mill, sawmill, biomass plant). Calculate distance and freight cost. Verify that the species/product combination has a buyer within economic distance.
- Regulatory: verify land use permits for commercial forestry, any environmental restrictions, and for regulated species (mahogany, cedar) — CITES compliance framework.
- Financial model: NPV and IRR with three MAI scenarios (conservative, base, optimistic) and timber price sensitivity. The conservative MAI scenario should be the one used for investment decision.
What species fits that site?
Forest suitability by species, MAI estimate by scenario and NPV/IRR analysis on the specific cadastral polygon.
Evaluate forest suitability →