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Mapping tree density at a global scale

机译：在全球范围内绘制树密度

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摘要

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.
机译：林木的全球范围和分布对于我们对陆地生物圈的了解至关重要。我们提供了全球范围内第一张森林树木密度的空间连续图。该图显示，全球树木总数约为3.04万亿，比先前的估计高出一个数量级。在这些树木中，约有1.39万亿存在于热带和亚热带森林中，其中北部地区有0.74万亿，温带地区有0.61万亿。树木密度的生物群落水平趋势表明，气候和地形对于控制更小尺度的当地树木密度具有重要意义，并且在世界大多数地方，人类具有压倒性的影响。根据我们预测的树木密度，我们估计每年砍伐的树木超过150亿棵，自人类文明开始以来，全球树木数量下降了约46％。

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  • 来源
    《Nature》 |2015年第7568期|201-205|共5页
  • 作者

    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.;

  • 作者单位

    Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA;

    Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA;

    Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA;

    Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA;

    Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA;

    Univ Helsinki, Dept Environm Sci, FIN-00014 Helsinki, Finland;

    Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA;

    Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA;

    Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA;

    Yale Univ, Dept Ecol & Evolutionary Biol, New Haven, CT 06511 USA;

    Yale Univ, Dept Ecol & Evolutionary Biol, New Haven, CT 06511 USA;

    Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA|Yale Univ, Dept Ecol & Evolutionary Biol, New Haven, CT 06511 USA|Univ London Imperial Coll Sci Technol & Med, Dept Life Sci, Ascot SL5 7PY, Berks, England;

    Univ La Frontera, Dept Ciencias Forestales, Temuco 4811230, Chile;

    RedCastle Resources, Salt Lake City, UT 84103 USA;

    Univ Fed Sul Bahia, BR-45613204 Ferradas, Itabuna, Brazil;

    Food & Agr Org United Nat, Forestry Dept, I-00153 Rome, Italy;

    Operat Wallacea, Spilbsy PE23 4EX, Leics, England|Univ Kent, DICE, SAC, Canterbury ME4 4AG, Kent, England;

    Operat Wallacea, Spilbsy PE23 4EX, Leics, England;

    CEA, URA 2210, CNRS, Mol Imaging Res Ctr MIRCen, F-91401 Orsay, France;

    Landcare Res, Lincoln 7640, New Zealand;

    Snowand Landscape Res, Swiss Fed Inst Forest, WSL, CH-8903 Birmensdorf, Switzerland;

    Univ Wageningen & Res Ctr, Environm Sci Grp, NL-6708 PB Wageningen, Netherlands;

    Univ Wageningen & Res Ctr, Environm Sci Grp, NL-6708 PB Wageningen, Netherlands;

    Ctr Forest Ecol & Prod RAS, Moscow 117997, Russia;

    Univ Hamburg, Inst Geog, CEN Ctr Earth Syst Res & Sustainabil, D-20146 Hamburg, Germany;

    Masaryk Univ, Dept Bot & Zool, Brno 61137, Czech Republic;

    South African Natl Biodivers Inst, Kirstenbosch Res Ctr, ZA-7735 Claremont, South Africa;

    Univ Bern, Inst Plant Sci, Bot Garden, CH-3013 Bern, Switzerland|Univ Bern, Oeschger Ctr Climate Change Res, CH-3013 Bern, Switzerland|Biodivers & Climate Res Ctr BIK F, Senckenberg Gesell Nat Forsch, D-60325 Frankfurt, Germany;

    Univ Bayreuth, Dept Plant Systemat, D-95447 Bayreuth, Germany;

    Univ Gottingen, Albrecht von Haller Inst Plant Sci, D-37073 Gottingen, Germany;

    Univ Lancaster, Trop Ecol Res Grp, Lancaster Environm Ctr, Lancaster LA1 4YQ, England;

    Univ Reg Blumenau, Dept Engn Florestal, BR-89030000 Blumenau, SC, Brazil;

    Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA;

    Peking Univ, Sinofrench Inst Earth Syst Sci, Coll Urban & Environm Sci, Beijing 100871, Peoples R China;

    Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA;

    Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA;

    Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA;

    Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA;

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