Use este identificador para citar ou linkar para este item: https://repositorio.inpa.gov.br/handle/1/14672
Título: Spatial and temporal dynamics of shifting cultivation in the middle-Amazonas river: Expansion and intensification
Autor: Jakovac, Catarina Conte
Dutrieux, Lo?c Paul
Siti, Latifah
Pena-Claros, Marielos
Bongers, Frans
Palavras-chave: Active Shifting Cultivation Landscape
Agricultural Intensification
Agricultural Management
Agricultural Procedures
Agriculture
Algorithm
Breakpoint Detection Algorithm
Controlled Study
Crop Production
Size Effect
Environmental Aspects And Related Phenomena
Environmental Parameters
Forestry
Land Accessibility
Land Use
Land Use Planning
Landscape
Middle Amazon River
Population Density
Probability
River
Secondary Forest Regrowth
Shifting Cultivation
Shorter Fallow Period
Spatial Dynamics
Survival Rate
Temporal Dynamics
Time Series Analysis
Environmental Protection
Forest
Growth, Development And Aging
Human
River
Tree
Agriculture
Conservation Of Natural Resources
Forests
Humans
Rivers
Trees
Data do documento: 2017
Revista: PLoS ONE
Encontra-se em: Volume 12, Número 7
Abstract: Shifting cultivation is the main land-use system transforming landscapes in riverine Amazonia. Increased concentration of the human population around villages and increasing market integration during the last decades may be causing agricultural intensification. Studies have shown that agricultural intensification, i.e. higher number of swidden-fallow cycles and shorter fallow periods, reduces crop productivity of swiddens and the regrowth capacity of fallows, undermining the resilience of the shifting cultivation system as a whole. We investigated the temporal and spatial dynamics of shifting cultivation in Brazilian Amazonia to test the hypotheses that (i) agriculture has become more intensive over time, and (ii) patterns of land-use intensity are related to land accessibility and human population density. We applied a breakpoint-detection algorithm to Landsat time-series spanning three decades (1984–2015) and retrieved the temporal dynamics of shifting cultivation fields, which go through alternating phases of crop production (swidden) and secondary forest regrowth (fallow). We found that fallow-period length has decreased from 6.4 to 5.1 years on average, and that expansion over old-growth forest has slowed down over time. Shorter fallow periods and higher frequency of slash and burn cycles are practiced closer to residences and around larger villages. Our results indicate that shifting cultivation in riverine Amazonia has gone through a process of agricultural intensification in the past three decades. The resulting landscape is predominantly covered by young secondary forests (≤ 12 yrs old), and 20% of it have gone through intensive use. Reversing this trend and avoiding the negative consequences of agricultural intensification requires land use planning that accounts for the constraints of land use in riverine areas. © 2017 Jakovac et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
DOI: 10.1371/journal.pone.0181092
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