Mapping tree density at a global scale. 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. Nature, 525(7568):201-205, 2015.
Mapping tree density at a global scale [link]Paper  doi  abstract   bibtex   
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.
@article{RN783,
   author = {Crowther, T. W. and Glick, H. B. and Covey, K. R. and Bettigole, C. and Maynard, D. S. and Thomas, S. M. and Smith, J. R. and Hintler, G. and Duguid, M. C. and Amatulli, G. and Tuanmu, M. N. and Jetz, W. and Salas, C. and Stam, C. and Piotto, D. and Tavani, R. and Green, S. and Bruce, G. and Williams, S. J. and Wiser, S. K. and Huber, M. O. and Hengeveld, G. M. and Nabuurs, G. J. and Tikhonova, E. and Borchardt, P. and Li, C. F. and Powrie, L. W. and Fischer, M. and Hemp, A. and Homeier, J. and Cho, P. and Vibrans, A. C. and Umunay, P. M. and Piao, S. L. and Rowe, C. W. and Ashton, M. S. and Crane, P. R. and Bradford, M. A.},
   title = {Mapping tree density at a global scale},
   journal = {Nature},
   volume = {525},
   number = {7568},
   pages = {201-205},
   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.},
   ISSN = {0028-0836},
   DOI = {10.1038/nature14967},
   url = {http://dx.doi.org/10.1038/nature14967},
   year = {2015},
   type = {Journal Article}
}
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