Ecoregional variations of aboveground biomass and stand structure in evergreen broadleaved forests

Abstract

Biotic and abiotic factors control aboveground biomass (AGB) and the structure of forest ecosystems. This study analyses the variation of AGB and stand structure of evergreen broadleaved forests among six ecoregions of Vietnam. A data set of 173 1-ha plots from 52 locations in undisturbed old-growth forests was developed. The results indicate that basal area and AGB are closely correlated with annual precipitation, but not with annual temperature, evaporation or hours of sunshine. Basal area and AGB are positively correlated with trees > 30 cm DBH. Most areas surveyed (52.6%) in these old-growth forests had AGB of 100–200 Mg ha⁻¹; 5.2% had AGB of 400–500 Mg ha⁻¹, and 0.6% had AGB of > 800 Mg ha⁻¹. Seventy percent of the areas surveyed had stand densities of 300–600 ind. ha⁻¹, and 64% had basal areas of 20–40 m² ha⁻¹. Precipitation is an important factor influencing the AGB of old-growth, evergreen broadleaved forests in Vietnam. Disturbances causing the loss of large-diameter trees (e.g., > 100 cm DBH) affects AGB but may not seriously affect stand density.

Keywords

Aboveground biomass / Carbon storage / Climatic variables / Ecoregion / Edaphic variables / Old-growth forest

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