Burning of secondary forest in Amazonia: Biomass, burning efficiency and charcoal formation during land preparation for agriculture in Apiau, Roraima, ... article from: Forest Ecology and Management]

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Description:
In a burn of 5-year-old secondary forest cleared for agriculture in Roraima, Brazil, carbon partitioning was measured for above-ground portions of both secondary forest (regrowth) and the remains of original forest, felled and burned six years previously. Above-ground dry weight biomass averaged 43.0+/-6.5Mg (megagrams=metric tons) per hectare (Mgha^-^1) for secondary forest and 105.8+/-23.7Mgha^-^1 for original forest remains. Pre- and post-burn above-ground biomass loadings were estimated by cutting and weighing six 60-m^2 plots and by line-intersect sampling (LIS) done along the axis of each post-burn plot (three transects), plus two supplementary LIS transects. High variability of initial biomass made LIS more reliable for assessing change in material >10cm in diameter; quantities for diameter classes