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Title: A global view of shifting cultivation: Recent, current, and future extent

Abstract

Mosaic landscapes under shifting cultivation, with their dynamic mix of managed and natural land covers, often fall through the cracks in remote sensing-based land cover and land use classifications, as these are unable to adequately capture such landscapes' dynamic nature and complex spectral and spatial signatures. But information about such landscapes is urgently needed to improve the outcomes of global earth system modelling and large-scale carbon and greenhouse gas accounting. This study combines existing global Landsat-based deforestation data covering the years 2000 to 2014 with very high-resolution satellite imagery to visually detect the specific spatio-temporal pattern of shifting cultivation at a one-degree cell resolution worldwide. The accuracy levels of our classification were high with an overall accuracy above 87%. We estimate the current global extent of shifting cultivation and compare it to other current global mapping endeavors as well as results of literature searches. Based on an expert survey, we make a first attempt at estimating past trends as well as possible future trends in the global distribution of shifting cultivation until the end of the 21 st century. With 62% of the investigated one-degree cells in the humid and sub-humid tropics currently showing signs of shifting cultivation$-$the majority inmore » the Americas (41%) and Africa (37%)$-$this form of cultivation remains widespread, and it would be wrong to speak of its general global demise in the last decades. We estimate that shifting cultivation landscapes currently cover roughly 280 million hectares worldwide, including both cultivated fields and fallows. While only an approximation, this estimate is clearly smaller than the areas mentioned in the literature which range up to 1,000 million hectares. Based on our expert survey and historical trends we estimate a possible strong decrease in shifting cultivation over the next decades, raising issues of livelihood security and resilience among people currently depending on shifting cultivation.« less

Authors:
ORCiD logo; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Org.:
USDOE; Swiss National Science Foundation (SNSF); Institute of Geography and the Centre for Development and Environment (CDE)
OSTI Identifier:
1380064
Alternate Identifier(s):
OSTI ID: 1425663
Grant/Contract Number:  
SC0012972
Resource Type:
Published Article
Journal Name:
PLoS ONE
Additional Journal Information:
Journal Name: PLoS ONE Journal Volume: 12 Journal Issue: 9; Journal ID: ISSN 1932-6203
Publisher:
Public Library of Science (PLoS)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Heinimann, Andreas, Mertz, Ole, Frolking, Steve, Egelund Christensen, Andreas, Hurni, Kaspar, Sedano, Fernando, Parsons Chini, Louise, Sahajpal, Ritvik, Hansen, Matthew, Hurtt, George, and Poulter, ed., Benjamin. A global view of shifting cultivation: Recent, current, and future extent. United States: N. p., 2017. Web. doi:10.1371/journal.pone.0184479.
Heinimann, Andreas, Mertz, Ole, Frolking, Steve, Egelund Christensen, Andreas, Hurni, Kaspar, Sedano, Fernando, Parsons Chini, Louise, Sahajpal, Ritvik, Hansen, Matthew, Hurtt, George, & Poulter, ed., Benjamin. A global view of shifting cultivation: Recent, current, and future extent. United States. doi:10.1371/journal.pone.0184479.
Heinimann, Andreas, Mertz, Ole, Frolking, Steve, Egelund Christensen, Andreas, Hurni, Kaspar, Sedano, Fernando, Parsons Chini, Louise, Sahajpal, Ritvik, Hansen, Matthew, Hurtt, George, and Poulter, ed., Benjamin. Fri . "A global view of shifting cultivation: Recent, current, and future extent". United States. doi:10.1371/journal.pone.0184479.
@article{osti_1380064,
title = {A global view of shifting cultivation: Recent, current, and future extent},
author = {Heinimann, Andreas and Mertz, Ole and Frolking, Steve and Egelund Christensen, Andreas and Hurni, Kaspar and Sedano, Fernando and Parsons Chini, Louise and Sahajpal, Ritvik and Hansen, Matthew and Hurtt, George and Poulter, ed., Benjamin},
abstractNote = {Mosaic landscapes under shifting cultivation, with their dynamic mix of managed and natural land covers, often fall through the cracks in remote sensing-based land cover and land use classifications, as these are unable to adequately capture such landscapes' dynamic nature and complex spectral and spatial signatures. But information about such landscapes is urgently needed to improve the outcomes of global earth system modelling and large-scale carbon and greenhouse gas accounting. This study combines existing global Landsat-based deforestation data covering the years 2000 to 2014 with very high-resolution satellite imagery to visually detect the specific spatio-temporal pattern of shifting cultivation at a one-degree cell resolution worldwide. The accuracy levels of our classification were high with an overall accuracy above 87%. We estimate the current global extent of shifting cultivation and compare it to other current global mapping endeavors as well as results of literature searches. Based on an expert survey, we make a first attempt at estimating past trends as well as possible future trends in the global distribution of shifting cultivation until the end of the 21st century. With 62% of the investigated one-degree cells in the humid and sub-humid tropics currently showing signs of shifting cultivation$-$the majority in the Americas (41%) and Africa (37%)$-$this form of cultivation remains widespread, and it would be wrong to speak of its general global demise in the last decades. We estimate that shifting cultivation landscapes currently cover roughly 280 million hectares worldwide, including both cultivated fields and fallows. While only an approximation, this estimate is clearly smaller than the areas mentioned in the literature which range up to 1,000 million hectares. Based on our expert survey and historical trends we estimate a possible strong decrease in shifting cultivation over the next decades, raising issues of livelihood security and resilience among people currently depending on shifting cultivation.},
doi = {10.1371/journal.pone.0184479},
journal = {PLoS ONE},
number = 9,
volume = 12,
place = {United States},
year = {2017},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1371/journal.pone.0184479

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Cited by: 11 works
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    Works referencing / citing this record:

    Forest understories controlled the soil organic carbon stock during the fallow period in African tropical forest: a 13C analysis
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    Effects of protected area establishment and cash crop price dynamics on land use transitions 1990–2017 in north-eastern Madagascar
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