A case study of carbon fluxes from land change in the Southwest Brazilian Amazon

Figures & data

Figure 1. Rio Branco, the capital city of Acre, Brazil, in the Southwest Brazilian Amazon.

Table 1. User's accuracy of land-cover classifications using classification tree analysis, maximum likelihood, and unsupervised methods

	Method
Class	CTA	MAXLIKE	UNSUP
Forest	98.67	88.67	91.03
Pasture	70.00	81.38	86.67
Secondary	78.67	57.14	89.33
User's accuracy	82.44	76.09	88.99

Figure 2. Land change in the municipality of Rio Branco, 1993–2003.

Figure 3. Transitions between land cover types for the three intervals used in the analysis: 1993–1996, 1996–1999, and 1999–2003.

Table 2. Carbon fluxes (metric tons) per land cover transition for each time period in the analysis

Transition	Flux (tC)
1993–1996
Forest to pasture	1,091,453
Secondary growth to pasture	30,532
Secondary uptake	−719,636
Secondary to forest	−43,800
Total	358,550
1996–1999
Forest to pasture	708,158
Secondary growth to pasture	3644
Secondary uptake	−1,270,230
Secondary to forest	−12,400
Total	−570,829
1999–2003
Forest to pasture	1,432,507
Secondary growth to pasture	36,282
Secondary uptake	−1,471,143
Secondary to forest	−107,887
Total	−110,242
Net C uptake, 1993–2003	322,521