10.5061/DRYAD.R87P0
Aleman, Julie C.
Yale University
Jarzyna, Marta A.
Yale University
Staver, A. Carla
Yale University
Data from: Forest extent and deforestation in tropical Africa since 1900
Dryad
dataset
2018
National Science Foundation
http://dx.doi.org/10.13039/100000001
US NSF DMS-1615531
2018-11-20T00:00:00Z
en
https://doi.org/10.1038/s41559-017-0406-1
6491141 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Accurate estimates of historical forest extent and associated
deforestation rates are crucial for quantifying tropical carbon cycles and
formulating conservation policy. In Africa, data-driven estimates of
historical closed-canopy forest extent and deforestation at the
continental scale are lacking, and existing modelled estimates diverge
substantially. Here, we synthesize available palaeo-proxies and historical
maps to reconstruct forest extent in tropical Africa around 1900, when
European colonization accelerated markedly, and compare these historical
estimates with modern forest extent to estimate deforestation. We find
that forests were less extensive in 1900 than bioclimatic models predict.
Resultantly, across tropical Africa, ~ 21.7% of forests have been
deforested, yielding substantially slower deforestation than previous
estimates (35–55%). However, deforestation was heterogeneous: West and
East African forests have undergone almost complete decline (~ 83.3 and
93.0%, respectively), while Central African forests have expanded at the
expense of savannahs (~ 1.4% net forest expansion, with ~ 135,270 km2 of
savannahs encroached). These results suggest that climate alone does not
determine savannah and forest distributions and that many savannahs
hitherto considered to be degraded forests are instead relatively old.
These data-driven reconstructions of historical biome distributions will
inform tropical carbon cycle estimates, carbon mitigation initiatives and
conservation planning in both forest and savannah systems.
Probability of forest for 1900, 70% tree coverThis raster contains the
median modelled probability of forest for the year 1900 and computed using
a tree cover threshold of 70%.Proba_for_1900_70TC.tifProbability of forest
for 2000, 70% tree coverThis raster contains the median modelled
probability of forest for the year 2000 and computed using a tree cover
threshold of 70%.Proba_for_2000_70TC.tifForest and savanna distribution
for 1900, 70% tree coverThis raster contains the modelled distribution of
forest (coded 1) and savanna (coded 0) for the year 1900, and using a
probability threshold of 0.5 and for 70% tree cover
threshold.Forest1900_thres05_70TC.tifForest and savanna distribution for
2000, 70% tree coverThis raster contains the modelled distribution of
forest (coded 1) and savanna (coded 0) for the year 2000, and using a
probability threshold of 0.5 and for 70% tree cover
threshold.Forest2000_probthres05_70TC_UNC.tifForest changes between 1900
and 2000, 70% tree coverThis raster contains the changes in forest area
between 1900 and 2000, for 70% tree cover threshold. The corresponding
codes are: 0=savanna, 1=deforestation, 2=afforestation and
3=forest.Forest_change_70TC.tifProbability of forest for 1900, 75% tree
coverThis raster contains the median modelled probability of forest for
the year 1900 and computed using a tree cover threshold of
75%.Proba_for_1900_75TC.tifProbability of forest for 2000, 75% tree
coverThis raster contains the median modelled probability of forest for
the year 2000 and computed using a tree cover threshold of
75%.Proba_for_2000_75TC.tifForest and savanna distribution for 1900, 75%
tree coverThis raster contains the modelled distribution of forest (coded
1) and savanna (coded 0) for the year 1900, and using a probability
threshold of 0.5 and for 75% tree cover
threshold.Forest1900_thres05_75TC.tifForest and savanna distribution for
2000, 75% tree coverThis raster contains the modelled distribution of
forest (coded 1) and savanna (coded 0) for the year 2000, and using a
probability threshold of 0.5 and for 75% tree cover
threshold.Forest2000_thres05_75TC.tifForest changes between 1900 and 2000,
75% tree coverThis raster contains the changes in forest area between 1900
and 2000, for 75% tree cover threshold.The corresponding codes are:
0=savanna, 1=deforestation, 2=afforestation and
3=forest.Forest_change_75TC.tifProbability of forest for 1900, 65% tree
coverThis raster contains the median modelled probability of forest for
the year 1900 and computed using a tree cover threshold of
65%.Proba_for_1900_65TC.tifProbability of forest for 2000, 65% tree
coverThis raster contains the median modelled probability of forest for
the year 2000 and computed using a tree cover threshold of
65%.Proba_for_2000_65TC.tifForest and savanna distribution for 1900, 65%
tree coverThis raster contains the modelled distribution of forest (coded
1) and savanna (coded 0) for the year 1900, and using a probability
threshold of 0.5 and for 65% tree cover
threshold.Forest1900_thres05_65TC.tifForest and savanna distribution for
2000, 65% tree coverThis raster contains the modelled distribution of
forest (coded 1) and savanna (coded 0) for the year 2000, and using a
probability threshold of 0.5 and for 65% tree cover
threshold.Forest2000_thres05_65TC.tifForest changes between 1900 and 2000,
65% tree coverThis raster contains the changes in forest area between 1900
and 2000, for 65% tree cover threshold. The corresponding codes are:
0=savanna, 1=deforestation, 2=afforestation and
3=forest.Forest_change_65TC.tifConfidence levels for 1900 and 70% tree
coverRaster containing the confidence levels in defining forest and
savanna distribution and boundaries for 1900 for forest defined as 70%
tree cover threshold and for a probability > 0.5. The confidence
levels are expressed between 0 (less confident), and 1 (more
confident).Forest1900_probthres05_70TC_UNC.tifConfidence levels for 2000
and 70% tree coverRaster containing the confidence levels in defining
forest and savanna distribution and boundaries for 2000 for forest defined
as 70% tree cover threshold and for a probability > 0.5. The
confidence levels are expressed between 0 (less confident), and 1 (more
confident).Forest2000_probthres05_70TC_UNC.tifConfidence levels for 1900
and 75% tree coverRaster containing the confidence levels in defining
forest and savanna distribution and boundaries for 1900 for forest defined
as 75% tree cover threshold and for a probability > 0.5. The
confidence levels are expressed between 0 (less confident), and 1 (more
confident).Forest1900_probthres05_75TC_UNC.tifConfidence levels for 2000
and 75% tree coverRaster containing the confidence levels in defining
forest and savanna distribution and boundaries for 2000 for forest defined
as 75% tree cover threshold and for a probability > 0.5. The
confidence levels are expressed between 0 (less confident), and 1 (more
confident).Forest2000_probthres05_75TC_UNC.tifConfidence levels for 1900
and 65% tree coverRaster containing the confidence levels in defining
forest and savanna distribution and boundaries for 1900 for forest defined
as 65% tree cover threshold and for a probability > 0.5. The
confidence levels are expressed between 0 (less confident), and 1 (more
confident).Forest1900_probthres05_65TC_UNC.tifConfidence levels for 2000
and 65% tree coverRaster containing the confidence levels in defining
forest and savanna distribution and boundaries for 2000 for forest defined
as 65% tree cover threshold and for a probability > 0.5. The
confidence levels are expressed between 0 (less confident), and 1 (more
confident).Forest2000_probthres05_65TC_UNC.tif
Tropical Africa