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dc.contributor.authorJakovac, Catarina Conte-
dc.contributor.authorDutrieux, Lo?c Paul-
dc.contributor.authorSiti, Latifah-
dc.contributor.authorPena-Claros, Marielos-
dc.contributor.authorBongers, Frans-
dc.description.abstractShifting 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.en
dc.relation.ispartofVolume 12, Número 7pt_BR
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Brazil*
dc.subjectActive Shifting Cultivation Landscapeen
dc.subjectAgricultural Intensificationen
dc.subjectAgricultural Managementen
dc.subjectAgricultural Proceduresen
dc.subjectBreakpoint Detection Algorithmen
dc.subjectControlled Studyen
dc.subjectCrop Productionen
dc.subjectSize Effecten
dc.subjectEnvironmental Aspects And Related Phenomenaen
dc.subjectEnvironmental Parametersen
dc.subjectLand Accessibilityen
dc.subjectLand Useen
dc.subjectLand Use Planningen
dc.subjectMiddle Amazon Riveren
dc.subjectPopulation Densityen
dc.subjectSecondary Forest Regrowthen
dc.subjectShifting Cultivationen
dc.subjectShorter Fallow Perioden
dc.subjectSpatial Dynamicsen
dc.subjectSurvival Rateen
dc.subjectTemporal Dynamicsen
dc.subjectTime Series Analysisen
dc.subjectEnvironmental Protectionen
dc.subjectGrowth, Development And Agingen
dc.subjectConservation Of Natural Resourcesen
dc.titleSpatial and temporal dynamics of shifting cultivation in the middle-Amazonas river: Expansion and intensificationen
dc.publisher.journalPLoS ONEpt_BR
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