Tropical Deforestation and Habitat Fragmentation in the Amazon: Satellite Data from 1978 to 1988
Summary (1 min read)
Introduction
- Skole, D., and C. Tucker, also known as Reproduced, with permission, from.
- Tropical deforestation and habitat fragmentation in the Amazon: Satellite data from 1978 to 1988.
Background
- Tropical deforestation is a major component of the carbon cycle and has profound implications for biological diversity.
- The primary adverse effect of tropical deforestation is massive extinction of species including, for the first time, large numbers of vascular plant species (10).
- The authors extracted forest fragments <100 km2 that were isolated by deforestation and computed edge effects for a zone of 1 km along the boundaries.
- The authors used 50 digital Landsat Multispectral Scanner (MSS) scenes from 1986 and 15 digital Thematic Mapper images from 1988 for detailed examination of Acre, Amazonas, Mato Grosso, Para, and Rondonia.
Deforestation and Forest Fragmentation
- The difference is a result of three factors: (i) different stratification of forest, cerrado, and water; (ii) slightly different estimates of secondary growth, which is spectrally similar to intact forest in channel five; and (iii) positional accuracy, interpretation, and boundary generalization.
- In addition, many deforested areas are in stages of regrowth following abandonment (26).
REFERENCES AND NOTES
- "The Forest Resources of the Tropical Zone by Main Ecological Regions," Report to the United Nations Conference on Environment and Development by the Forest Resource Assessment 1990 Project (Food and Agriculture Organization of the United Nations, Rome, 1992) The FAO Forest Assessment 1990 Project has produced several reports, and estimates from them have varied considerably.
- The authors acknowledge S. Tilford and W. Huntress for initiating this research, W. Chomentowski for assistance in developing the satellite and GIS database, and A. Nobre for his assistance in interpreting the satellite data.
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...Indeed, in some studies, mixed pixels have been identified as the most important cause of misclassifi- cation (e.g., CCRS, 1999) and a major contributor to the misestimation of land cover change (Skole & Tucker, 1993)....
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Frequently Asked Questions (6)
Q2. How many km2 of deforestation were extracted?
The authors extracted forest fragments <100 km2 that were isolated by deforestation and computed edge effects for a zone of 1 km along the boundaries.
Q3. How many digital maps were used for the study?
The authors used 50 digital Landsat Multispectral Scanner (MSS) scenes from 1986 and 15 digital Thematic Mapper images from 1988 for detailed examination of Acre, Amazonas, Mato Grosso, Para, and Rondonia.
Q4. How many square kilometers of tropical deforestation did the Brazilian Amazon Basin in 1988?
Tropical deforestation increased from 78,000 square kilometers in 1978 to 230,000 square kilometers in 1988 while tropical forest habitat, severely affected with respect to biological diversity, increased from 208,000 to 588,000 square kilometers.
Q5. What was the support for this work?
This work was supported by National Aeronautics and Space Administration's mission to planet Earth and the Eos Data Information System's Landsat Pathfinder Program.
Q6. What was the extent of deforestation in the Brazilian Amazon in 1978 and 1988?
The authors found that 6% of closed-canopy forest had been cleared as of 1988 and ~15% of the forested Amazon was affected by deforestation-caused habitat destruction, habitat isolation, and edge effects (Fig. 2 and Table 3).