Biogeochemistry of Deforestation and Biomass Burning

Kauffman, J. Boone; Till, Ken M.; Shea, Ronald W.

doi:10.1021/bk-1992-0483.ch023

Cited by 14 publications

(7 citation statements)

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“…For the latter, 0.27 is used (Kauffman et al 1992). Both A f-c and A f-r are included, the latter for areas that had been deforested and fallowed within the satellite image dates.…”

Section: Estimation Of Carbon Storage and Fluxesmentioning

confidence: 99%

“…where C f-c is the carbon flux from mature forest clearance (Mg), A f-c and A f-r are the areas of transition from forest to clearance and forest to regrowth (km 2 ), and E f is the combustion efficiency of mature forest clearance (unitless fraction). For the latter, 0.27 is used (Kauffman et al 1992). Both A f-c and A f-r are included, the latter for areas that had been deforested and fallowed within the satellite image dates.…”

Section: Estimation Of Carbon Storage and Fluxesmentioning

confidence: 99%

“…where C r-c is the carbon flux from secondary forest clearance (in Mg), A r-c is the area of regrowth to clearance transition (in km 2 ), B r is the average biomass for regrowth at the time of clearing (in Mg), E r is the combustion efficiency of secondary forest clearance (unitless fraction), and G r is the average accumulation of aboveground biomass during fallow period P. A value of 0.6 (Kauffman et al 1992) was used for the combustion efficiency of secondary forest clearance. The above calculations account only for the carbon released during the initial cutting and burning of forest and regrowth biomass, with combustion efficiencies of E f and E r .…”

Section: Estimation Of Carbon Storage and Fluxesmentioning

confidence: 99%

“…A second estimate was made for the carbon that is committed to be released over the subsequent 10 yr by decomposition and reburning of the remaining biomass. In the humid tropics, almost all of felled biomass is gradually decomposed or burned within 10 yr (Kauffman et al 1992, Fearnside 1996. In this model, the assumption is that a total of 95% of the original aboveground vegetative carbon is ''committed'' to be released to the atmosphere within 10 yr following forest clearance.…”

Section: Estimation Of Carbon Storage and Fluxesmentioning

confidence: 99%

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Net Carbon Fluxes From Forest Clearance and Regrowth in the Amazon

Steininger

2004

Ecological Applications

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Abstract. Estimates of net carbon exchange resulting from forest clearance and regrowth were made for three areas in the Brazilian and Bolivian Amazon. The study areas, ranging in size from 600 to 10 000 km 2 , include communities that practice a range of land uses from small-scale, rotational agriculture to long-term pasture. Carbon emissions from deforestation were estimated based on rates of deforestation derived from Landsat satellite data and published estimates of mature forest biomass. Estimates of carbon uptake by secondary forest regrowth were based on area estimates from the satellite data and biomass estimates from field surveys. Estimates of carbon emissions from the clearance of secondary forest were included. The total carbon emissions were partitioned into that immediately released by biomass burning during clearance and that from subsequent decomposition and burning of felled biomass. A range of net carbon fluxes from secondary forest regrowth and clearance was estimated by extrapolating land-use patterns in each study area to the entire area of deforested landscape in Amazonian Brazil and Bolivia, and by varying average biomass accumulation rate of regrowing forest and fallow period.Over 60 km 2 of forest were cleared from 1988 to 1995 in each of the Brazilian study areas, and over 940 km 2 were cleared from 1986 to 1996 in the Bolivian study area. This resulted in 30-200 Mg C/yr emitted from biomass burning during deforestation. If the carbon that is committed to subsequent burning and decomposition of felled biomass is included, total committed emissions of 75-650 Mg C/yr resulted from deforestation in each study area. The carbon uptake by secondary forests was 33-435 Mg C/yr. However, emissions from the reclearance of secondary forests were nearly as large: 17-365 Mg C/yr. Extrapolation of these results to the Brazilian and Bolivian Amazon suggests that, at the national level, carbon uptake by secondary forests offset less than one-fifth of the carbon emissions from deforestation. Despite differences in land-use pattern, average fallow period, and rate of biomass accumulation used in the extrapolation, net carbon uptake by secondary forests was consistently small when compared to the total emissions from deforestation.

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“…For the latter, 0.27 is used (Kauffman et al 1992). Both A f-c and A f-r are included, the latter for areas that had been deforested and fallowed within the satellite image dates.…”

Section: Estimation Of Carbon Storage and Fluxesmentioning

confidence: 99%

Section: Estimation Of Carbon Storage and Fluxesmentioning

confidence: 99%

Section: Estimation Of Carbon Storage and Fluxesmentioning

confidence: 99%

Section: Estimation Of Carbon Storage and Fluxesmentioning

confidence: 99%

See 2 more Smart Citations

Net Carbon Fluxes From Forest Clearance and Regrowth in the Amazon

Steininger

2004

Ecological Applications

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“…Fire is the main tool for clearing forest in Amazonia [Setzer et al, 1998;Kauffman et al, 1992]. Fire is the main tool for clearing forest in Amazonia [Setzer et al, 1998;Kauffman et al, 1992].…”

Section: Conversion Of Forest To Pasture and Cropsmentioning

confidence: 99%

The maintenance of soil fertility in Amazonian managed systems

Bustamante

Keller

Silva

2009

Geophysical Monograph Series

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Data for trace gas fluxes (NO x , N 2 O, and CH 4 ) from the Amazon and cerrado region are presented with focus on the processes of production and consumption of these trace gases in soils and how they may be changed because of land use changes in both regions. Fluxes are controlled by seasonality, soil moisture, soil texture, topography, and fine-root dynamics. Compared to Amazonian forests where the rapid cycling of nitrogen supports large emissions of N 2 O, nitrification rates and soil emissions of N oxide gases in the cerrado region are very low. Several studies report CH 4 consumption during both wet and dry seasons in forest soils, but there is occasionally net production of CH 4 during the wet season. A few studies suggest an unknown source of CH 4 from upland forests. As with N oxide emissions, there are few data on CH 4 emissions from cerrado soils, but CH 4 consumption occurs during both wet and dry seasons. Clearing natural vegetation, burning, fertilization of agricultural lands, intensive cattle ranching, and increasing dominance by legume species in areas under secondary succession after land conversion have all been identified as causes of increasing N 2 O and NO emissions from tropical regions. Large uncertainties remain for regional estimates of trace gas fluxes. Improvement of models for the N oxides and CH 4 fluxes for Amazonia and the cerrado still depends upon gathering more data from sites more widely distributed across two vast biomes and more importantly on basic theory about the controls of emissions from the ecosystem to the atmosphere.

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Auswirkungen hohen Bevölkerungswachstums

Leisinger

1993

Hoffnung Als Prinzip

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Biogeochemistry of Deforestation and Biomass Burning

Cited by 14 publications

References 0 publications

Net Carbon Fluxes From Forest Clearance and Regrowth in the Amazon

Net Carbon Fluxes From Forest Clearance and Regrowth in the Amazon

The maintenance of soil fertility in Amazonian managed systems

Auswirkungen hohen Bevölkerungswachstums

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