Rhizophora mucronata: Growth, Allometry and Carbon Potential

Updated 2026-11-02 · 4 min read · By the akar.earth specialist team

Rhizophora mucronata carbon sequestration: mangrove ecology, Indonesian names, wood density, Komiyama and Chave allometry, blue carbon role and planting risks.

Rhizophora mucronata sequesters carbon in dense wood, prop roots and, above all, in the waterlogged soils that build up beneath mangrove stands. It is one of the most widely planted mangroves in Indonesian rehabilitation, so getting its biomass estimate and planting site right matters for any blue carbon project.

Identity and range

Rhizophora mucronata is a true mangrove in the family Rhizophoraceae. In Indonesia it is commonly called bakau, bakau hitam, bakau besar or bangka, with many local variants. In English it is the loop-root or red mangrove (a name shared with other Rhizophora).

It is native across the Indo-West Pacific, from East Africa and the Red Sea through South and Southeast Asia to the western Pacific. In Indonesia, which has the largest mangrove area of any country, it occurs along sheltered coasts and estuaries in Sumatra, Kalimantan, Java, Sulawesi, Maluku and Papua. It is a staple of community and government mangrove rehabilitation along the north coast of Java and in East Kalimantan, among many other places.

Growth habit and rotation

R. mucronata is a tree that can reach 20 to 30 m in good conditions, though planted stands are often much shorter. It is recognised by arching prop (stilt) roots from the lower stem and aerial roots from branches.

It is viviparous: seeds germinate on the parent tree, producing long, cigar-shaped propagules that drop and root in mud. That makes it easy to collect and plant, which is why it dominates rehabilitation projects. It grows in the mid to lower intertidal zone, on muddy soils flooded by normal high tides, and prefers sheltered estuaries.

Rhizophora has been harvested on long rotations for charcoal and poles. A well-known example is the Matang Mangrove Forest Reserve in Malaysia, managed on a rotation of around 30 years. Reported growth rates vary widely with salinity, tidal regime and sediment supply.

Wood density and biomass estimation

R. mucronata has heavy wood. Reported basic density values fall roughly between 0.70 and 0.90 g/cm³. Wood density varies with site and age.

Two approaches are common:

• Komiyama et al. 2005 common mangrove equation. It estimates above-ground biomass from DBH and wood density, without height, and was built from many mangrove species. The same work gave a common root biomass equation, which matters because mangroves invest heavily in roots.
• Chave et al. 2014 pantropical model: AGB (kg) = 0.0673 × (ρ × D² × H)^0.976, with ρ in g/cm³, D in cm and H in m. It includes some mangrove data but was not designed specifically for them.

Species-specific Rhizophora equations have also been published from Southeast Asia. For any equation, measure DBH above the highest prop root and record the height. See our allometric equations guide.

Convert biomass to carbon with a carbon fraction (the IPCC default 0.47 is common; mangrove-specific values exist in the IPCC Wetlands Supplement) and to CO2 with 44/12.

Carbon role in blue carbon projects

• Soil carbon. Mangrove soils accumulate organic carbon over centuries and usually hold most of the ecosystem carbon. See mangrove soil carbon and mangrove vs terrestrial carbon.
• Restoration crediting. Mangrove restoration that claims soil carbon is usually developed under Verra’s VM0033 tidal wetland methodology. Check whether your design fits VM0033 or an ARR route.
• Pond rehabilitation. Abandoned aquaculture ponds can be reconnected to tides and replanted. See aquaculture pond rehabilitation.

For the bigger picture, see the blue carbon hub.

Co-benefits and livelihoods

R. mucronata stands protect coasts from erosion and storm waves, provide nursery habitat for fish, crabs and shrimp, and trap sediment. Communities harvest crabs and shellfish and, where allowed, poles and fuelwood.

Risks and cautions

• Wrong site. Planting on low mudflats, seagrass beds or ponds with the wrong elevation causes mass die-off. Restore hydrology first.
• Monoculture. Many projects plant only Rhizophora. Mixed planting and natural recruitment of other species give more resilient stands.
• Harvest and conversion. Cutting for charcoal or conversion to ponds reverses gains. Include this in permanence planning.
• Pests and smothering. Barnacles, crabs eating propagules and floating debris kill young plants.
• Sea-level rise. Stands without sediment supply or landward space can drown.

Worked example

A planted R. mucronata with DBH 15 cm (above prop roots), height 12 m and density 0.80 g/cm³, using Chave et al. 2014:

1. ρ × D² × H = 0.80 × 225 × 12 = 2,160
2. AGB = 0.0673 × 2,160^0.976 ≈ 121 kg
3. Carbon = 121 × 0.47 ≈ 57 kg C
4. CO2e = 57 × 44/12 ≈ 208 kg CO2e (above-ground only, excluding roots and soil)

Compare with the Komiyama common equation in your own model. Test above-ground values with the tree CO2 calculator, and see mangrove restoration carbon for whole-ecosystem accounting.