Meranti (Shorea spp.): Growth, Allometry and Carbon Potential

Updated 2026-11-02 · 3 min read · By the akar.earth specialist team

Meranti carbon sequestration: Shorea ecology, slow but long-lived growth, wood density range, dipterocarp allometry, restoration role and risks in Indonesia.

Meranti trees store large amounts of carbon over long lives, growing into emergent dipterocarps that hold much of the biomass in Indonesia’s lowland rainforests. In reforestation, meranti grows slower than pioneers at first, but it builds durable, long-term carbon stock and restores native forest structure.

Identity and range

Meranti is the trade name for many species of Shorea in the family Dipterocarpaceae. Indonesian trade groups include meranti merah (red meranti), meranti putih (white), meranti kuning (yellow) and balau or bangkirai (heavy Shorea such as S. laevis). Commonly planted species include Shorea leprosula, S. parvifolia, S. johorensis and S. selanica. Several Shorea species produce tengkawang (illipe nuts), notably S. stenoptera in West Kalimantan.

Shorea is native to Southeast Asia, with the greatest diversity in Borneo and Sumatra. Natural stands occur in lowland and hill forest in Kalimantan, Sumatra and smaller areas of other islands. Many species are threatened by logging and land conversion; check the IUCN Red List category for the species you plant.

Growth habit and rotation

Meranti seedlings tolerate partial shade and grow best with some overhead cover in early years, then need more light to reach the canopy. Mature trees can exceed 50 m with buttressed trunks. Dipterocarps form partnerships with ectomycorrhizal fungi, and nursery seedlings grow better when inoculated with soil from natural stands.

Fruiting is irregular. Many dipterocarps flower in mass “mast” years every few years, and seeds lose viability within days to weeks. That makes seed supply the main bottleneck for planting at scale; see nursery and survival rates.

Meranti is managed on long cutting cycles in natural-forest concessions. In enrichment and line planting, growth depends heavily on light and maintenance. Reported growth rates vary widely, and planted light red merantis such as S. leprosula are among the faster ones.

Wood density and biomass estimation

Wood density varies a lot across Shorea. Light red meranti is often reported around 0.35 to 0.45 g/cm³, many other merantis around 0.45 to 0.65, and balau or bangkirai species above 0.8 g/cm³. Always use the species value, not a genus average, where you can, and state the range.

The standard model is Chave et al. 2014:

AGB (kg) = 0.0673 × (ρ × D² × H)^0.976

with ρ in g/cm³, D (DBH) in cm and H in m. For large buttressed trees, measure diameter above the buttress, and record the height of measurement. Regional equations exist for lowland dipterocarp forest, including work from East Kalimantan (Basuki et al. 2009). Our allometric equations guide covers when a regional equation beats a pantropical one.

Biomass converts to carbon with the IPCC default 0.47 and to CO2 with 44/12.

Carbon role in ARR and agroforestry

Meranti is a keystone species for native restoration in ARR projects and for enrichment planting in degraded forest:

• Long-term stock. If it is not harvested, meranti keeps adding biomass for decades, which suits methodologies such as VM0047 that reward durable removals.
• Biodiversity and co-benefits. Native dipterocarps support far more biodiversity than exotic plantations, which strengthens CCB-type claims.
• Mixed planting. Planting meranti with fast pioneers gives early canopy cover and later long-term stock.

Co-benefits and livelihoods

Tengkawang nuts give communities in West Kalimantan a non-timber income. Restored dipterocarp forest supports wildlife, watershed protection and future sustainable timber.

Risks and cautions

• Seed supply and survival. Irregular fruiting and short seed life limit planting. Seedlings die in full sun and drought.
• Slow early growth. Ex-ante models that assume pioneer-like growth overestimate early credits.
• Logging pressure. Valuable timber attracts illegal logging. Factor this into permanence and reversal planning.
• Fire. Dipterocarps have thin bark and die in ground fires, a major risk in drought years.
• Legality. Meranti timber exports to the EU fall under EUDR wood rules.

Planning notes for project developers

• Plan around mast years. Coordinate seed collection across regions to catch mast fruiting, and keep wildling nurseries as a backup.
• Inoculate seedlings. Use forest soil or mycorrhizal inoculum in nursery media to improve growth.
• Maintain lines. Line-planted meranti needs regular clearing of competing vegetation for several years.

Worked example

A planted meranti with DBH 35 cm, height 25 m and wood density 0.48 g/cm³:

1. ρ × D² × H = 0.48 × 1,225 × 25 = 14,700
2. AGB = 0.0673 × 14,700^0.976 ≈ 786 kg
3. Carbon = 786 × 0.47 ≈ 369 kg C
4. CO2e = 369 × 44/12 ≈ 1,354 kg CO2e (above-ground only)

Try your own trees in the tree CO2 calculator.