Spatial and temporal dynamics of shifting cultivation in the middle-Amazonas river: Expansion and intensification
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 i...
| Autor principal: | Jakovac, Catarina Conte |
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| Outros Autores: | Dutrieux, Lo?c Paul, Siti, Latifah, Pena-Claros, Marielos, Bongers, Frans |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
PLoS ONE
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/14672 |
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oai:repositorio:1-14672 |
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oai:repositorio:1-14672 Spatial and temporal dynamics of shifting cultivation in the middle-Amazonas river: Expansion and intensification Jakovac, Catarina Conte Dutrieux, Lo?c Paul Siti, Latifah Pena-Claros, Marielos Bongers, Frans 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 Brasil Environmental Protection Forest Growth, Development And Aging Human River Tree Agriculture Brasil Conservation Of Natural Resources Forests Humans Rivers Trees 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. 2020-04-24T17:00:07Z 2020-04-24T17:00:07Z 2017 Artigo https://repositorio.inpa.gov.br/handle/1/14672 10.1371/journal.pone.0181092 en Volume 12, Número 7 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf PLoS ONE |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
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 Brasil Environmental Protection Forest Growth, Development And Aging Human River Tree Agriculture Brasil Conservation Of Natural Resources Forests Humans Rivers Trees |
| spellingShingle |
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 Brasil Environmental Protection Forest Growth, Development And Aging Human River Tree Agriculture Brasil Conservation Of Natural Resources Forests Humans Rivers Trees Jakovac, Catarina Conte Spatial and temporal dynamics of shifting cultivation in the middle-Amazonas river: Expansion and intensification |
| topic_facet |
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 Brasil Environmental Protection Forest Growth, Development And Aging Human River Tree Agriculture Brasil Conservation Of Natural Resources Forests Humans Rivers Trees |
| description |
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. |
| format |
Artigo |
| author |
Jakovac, Catarina Conte |
| author2 |
Dutrieux, Lo?c Paul Siti, Latifah Pena-Claros, Marielos Bongers, Frans |
| author2Str |
Dutrieux, Lo?c Paul Siti, Latifah Pena-Claros, Marielos Bongers, Frans |
| title |
Spatial and temporal dynamics of shifting cultivation in the middle-Amazonas river: Expansion and intensification |
| title_short |
Spatial and temporal dynamics of shifting cultivation in the middle-Amazonas river: Expansion and intensification |
| title_full |
Spatial and temporal dynamics of shifting cultivation in the middle-Amazonas river: Expansion and intensification |
| title_fullStr |
Spatial and temporal dynamics of shifting cultivation in the middle-Amazonas river: Expansion and intensification |
| title_full_unstemmed |
Spatial and temporal dynamics of shifting cultivation in the middle-Amazonas river: Expansion and intensification |
| title_sort |
spatial and temporal dynamics of shifting cultivation in the middle-amazonas river: expansion and intensification |
| publisher |
PLoS ONE |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/14672 |
| _version_ |
1787143324364177408 |
| score |
11.653393 |