Interactions between Rainfall, Deforestation, and Fires in the Brazilian Amazon
Author Information
Author(s): Aragão Luiz Eduardo O.C, Malhi Yadvinder, Barbier Nicolas, Lima Andre, Shimabukuro Yosio, Anderson Liana, Saatchi Sassan
Primary Institution: Environmental Change Institute, Oxford University Centre for the Environment, University of Oxford
Hypothesis
How do rainfall, deforestation, and fires interact in the Brazilian Amazon, particularly during drought conditions?
Conclusion
The study found that deforestation and fires are significantly influenced by seasonal rainfall patterns, with droughts exacerbating fire occurrences even when deforestation rates decrease.
Supporting Evidence
- Deforestation and fires peaked three and six months after the rainy season, respectively.
- The cumulative number of hot pixels was linearly related to the area deforested annually from 1998 to 2004.
- During the 2005 drought, the number of hot pixels increased by 43% compared to expected values for a similar deforested area.
- Anthropogenic factors like land-use change significantly influence fire occurrence patterns.
Takeaway
When it rains less in the Amazon, there are more fires, especially after trees are cut down. This means that less rain can lead to more fires, which is bad for the forest.
Methodology
The study analyzed satellite-derived time series data of rainfall, fires, and deforestation from 1998 to 2006 to quantify their seasonal patterns and relationships.
Limitations
The study did not consider political and economic variables that may influence fire dynamics in the region.
Statistical Information
P-Value
0.004
Statistical Significance
p=0.004
Digital Object Identifier (DOI)
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