The Bangladesh Forest Inventory:
Results at a Glance
What is the Bangladesh Forest Inventory?
- A national multi-purpose tree and forest monitoring system
- Robust estimates of the status of tree and forest resources and their value as ecosystem services
- Baseline information about natural resources in support to sustainable land management, planning, policy decisions, national and international reporting
Monitoring on the basis of 7 criteria and 47 indicators
How we collected data
Areas in Madhupur and Barind tract with small hillocks and plain land, consisting of mainly deciduous Sal forest. Common tree species are Shorea robusta, Albizia spp., Artocarpus heterophyllus, Swietenia mahagoni, Acacia auriculiformis etc. and homestead tree species such as Mangifera indica.
Hilly areas in the eastern part of the country. Common tree species are Dipterocarpus spp., Syzygium spp., Gmelina arborea, Ficus carica, Grewia spp., Albizia spp., Acacia auriculiformis, Artocarpus heterophyllus, Swietenia mahagoni, Tectona grandis, Acacia auriculiformis, and homestead tree species such as Mangifera indica.
Land Cover Map
- 1781 biophysical plots permanently established covering all land covers
- 775 plots were located in croplands where soils and other data were collected.
- Targeted national precision of ±5% and 90% confidence interval for tree resource estimates
- Sample intensity optimized by considering cost, accessibility, and desired precision.
- Field quality control performed on 5% of the plots
In the Hill, Sal, Coastal and Village zones one plot is composed by five sub-plots (A). In the Sundarban zone, one plot is composed by three sub-plots (B).In each subplot (C), seedling and sapling information was collected from the S plot. Trees having a Diameter at Breast Height >10 cm to 30 cm was collected from the M plot. All trees >30 cm DBH was collected from the L plot.Other Data collected in each plot were:
- Bamboos (species, diameter, height and culm count)
- Standing dead trees and stumps (height, diameter)
- Down woody debris
- Soil and litter samples
- Crop management
- Land feature description
- Allometric equations are used to estimate tree volume, biomass and carbon stock based on diameter (D), height (H) and wood density (WD).
- New equations were developed where there were no adequate existing equations. All the equations were compiled into a database.
- A decision tree is used to determined the most appropriate equation.
- The figure at the right shows nine equations developed at the zone level. The circles represent the relative number of existing specific equations from locations throughout Bangladesh.
- Forest cover 12.8% of the total country area
- When only land area is considered, forest cover is 14.1%
- This amounts to 0.03 acres forest per person
- Highest forest cover in the Hill and Sundarban zones
Tree cover change from 2000 to 2015
Tree cover increased
- Mangrove Plantation (12%)
- Mangrove Forest (4%)
Tree cover decreased
- Sal Forest (18%)
- Hill Forest (8%)
Number of tree species
- Aboveground biomass is an important indicator of the quantity of trees available for fuels, food, building materials, and other commercial purposes.
- Total national AGB of the country is 387 million tons.
- Mango (Mangifera indica), Sundri (Heritiera fomes), and Mehagoni (Swietenia mahagoni) are the top three species by biomass.
Gross tree volume by zone "million m3"
- Carbon stocks are important to the global carbon cycle and climate change mitigation
- The highest carbon densities are in the Sylhet Division, especially in the soils pool
- The largest aboveground carbon stock density occurred in the Barisal Division
Soil Carbon Stock
- The BFI provides the first sample-based estimate of soil carbon stock in Bangladesh
- Land management has a significant impact on carbon sequestered in soils
- Forest soils have 38% higher carbon than other soils
Natural and Human Disturbance
Services and benefits from trees and forest
- Every household surveyed received at least one service from trees and forests
- 65% of women, are involved with collecting primary tree and forest products
- 54% households received medicinal benefits
Total annual income from trees and forests
Economic value of primary products from trees and forests
- The total value of primary tree and forest products collected is 3.11% of the 2017-18’s national GDP.
- The most important are fruits, which are 45% of the total economic value
Value of Non Wood Forest Products collected from Forest areas
- Many people living near forests depend on non-wood forest products.
- The most valuable products are fruits, bamboo, honey and brooms used mainly from Hill Forests.