Mapping tree density at a global scale

Overview of attention for article published in Nature, September 2015
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  • In the top 5% of all research outputs scored by Altmetric
  • High Attention Score compared to outputs of the same age (99th percentile)
  • High Attention Score compared to outputs of the same age and source (99th percentile)

Readers on

mendeley
588 Mendeley
citeulike
7 CiteULike
Title
Mapping tree density at a global scale
Published in
Nature, September 2015
DOI 10.1038/nature14967
Pubmed ID
Authors

T. W. Crowther, H. B. Glick, K. R. Covey, C. Bettigole, D. S. Maynard, S. M. Thomas, J. R. Smith, G. Hintler, M. C. Duguid, G. Amatulli, M.-N. Tuanmu, W. Jetz, C. Salas, C. Stam, D. Piotto, R. Tavani, S. Green, G. Bruce, S. J. Williams, S. K. Wiser, M. O. Huber, G. M. Hengeveld, G.-J. Nabuurs, E. Tikhonova, P. Borchardt, C.-F. Li, L. W. Powrie, M. Fischer, A. Hemp, J. Homeier, P. Cho, A. C. Vibrans, P. M. Umunay, S. L. Piao, C. W. Rowe, M. S. Ashton, P. R. Crane, M. A. Bradford, Crowther, T W, Glick, H B, Covey, K R, Bettigole, C, Maynard, D S, Thomas, S M, Smith, J R, Hintler, G, Duguid, M C, Amatulli, G, Tuanmu, M-N, Jetz, W, Salas, C, Stam, C, Piotto, D, Tavani, R, Green, S, Bruce, G, Williams, S J, Wiser, S K, Huber, M O, Hengeveld, G M, Nabuurs, G-J, Tikhonova, E, Borchardt, P, Li, C-F, Powrie, L W, Fischer, M, Hemp, A, Homeier, J, Cho, P, Vibrans, A C, Umunay, P M, Piao, S L, Rowe, C W, Ashton, M S, Crane, P R, Bradford, M A

Abstract

The global extent and distribution of forest trees is central to our understanding of the terrestrial biosphere. We provide the first spatially continuous map of forest tree density at a global scale. This map reveals that the global number of trees is approximately 3.04 trillion, an order of magnitude higher than the previous estimate. Of these trees, approximately 1.39 trillion exist in tropical and subtropical forests, with 0.74 trillion in boreal regions and 0.61 trillion in temperate regions. Biome-level trends in tree density demonstrate the importance of climate and topography in controlling local tree densities at finer scales, as well as the overwhelming effect of humans across most of the world. Based on our projected tree densities, we estimate that over 15 billion trees are cut down each year, and the global number of trees has fallen by approximately 46% since the start of human civilization.

Twitter Demographics

The data shown below were collected from the profiles of 974 tweeters who shared this research output. Click here to find out more about how the information was compiled.

Mendeley readers

The data shown below were compiled from readership statistics for 588 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
United States 28 5%
Brazil 18 3%
Germany 6 1%
United Kingdom 6 1%
France 6 1%
Canada 4 <1%
Spain 4 <1%
Switzerland 4 <1%
Colombia 4 <1%
Other 30 5%
Unknown 478 81%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 165 28%
Researcher 150 26%
Student > Master 80 14%
Student > Bachelor 54 9%
Professor 30 5%
Other 109 19%
Readers by discipline Count As %
Agricultural and Biological Sciences 240 41%
Environmental Science 200 34%
Earth and Planetary Sciences 71 12%
Engineering 20 3%
Physics and Astronomy 12 2%
Other 45 8%

Attention Score in Context

This research output has an Altmetric Attention Score of 1656. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 27 February 2017.
All research outputs
#391
of 7,436,163 outputs
Outputs from Nature
#115
of 45,539 outputs
Outputs of similar age
#15
of 226,990 outputs
Outputs of similar age from Nature
#5
of 905 outputs
Altmetric has tracked 7,436,163 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 99th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 45,539 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 69.9. This one has done particularly well, scoring higher than 99% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 226,990 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 99% of its contemporaries.
We're also able to compare this research output to 905 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 99% of its contemporaries.