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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Persistent effects of a severe drought on Amazonian forest canopy
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Persistent effects of a severe drought on Amazonian forest canopy

机译：严重干旱对亚马逊森林冠层的持续影响

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摘要

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109,Institute of Environment, University of California, Los Angeles, CA 90045;Institute of Environment, University of California, Los Angeles, CA 90045;Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford OX1 3QY, United Kingdom;College of Life and Environmental Sciences, University of Exeter, Devon EX4 4RJ, United Kingdom;Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford OX1 3QY, United Kingdom,Remote Sensing Division, National Institute for Space Research (INPE), Sao Jose dos Campos, Sao Paulo 12227-010, Brazil;Department of Geography and Environment, Boston University, Boston, MA 02215;Biospheric Sciences Branch, National Aeronautics and Space Administration/Ames Research Center, Moffett Field, CA 94035;%Recent Amazonian droughts have drawn attention to the vulnerability of tropical forests to climate perturbations. Satellite and in situ observations have shown an increase in fire occurrence during drought years and tree mortality following severe droughts, but to date there has been no assessment of long-term impacts of these droughts across landscapes in Amazonia. Here, we use satellite microwave observations of rainfall and canopy backscatterto show that more than 70 million hectares of forest in western Amazonia experienced a strong water deficit during the dry season of 2005 and a closely corresponding decline in canopy structure and moisture. Remarkably, and despite the gradual recovery in total rainfall in subsequent years, the decrease in canopy backscatter persisted until the next major drought, in 2010. The decline in backscatter is attributed to changes in structure and water content associated with the forest upper canopy. The persistence of low backscatter supports the slow recovery (>4 y) of forest canopy structure after the severe drought in 2005. The result suggests that the occurrence of droughts in Amazonia at 5-10 y frequency may lead to persistent alteration of the forest canopy.
机译：加利福尼亚理工学院喷气推进实验室，加利福尼亚州帕萨迪纳市91109，加利福尼亚大学环境研究所，加利福尼亚州CA 90045；加利福尼亚大学洛杉矶分校环境研究所，加利福尼亚州90045；地理与环境学院环境变化研究所英国牛津大学环境学院，牛津OX1 3QY；英国埃克塞特大学生命与环境科学学院，德文郡EX4 4RJ；英国牛津大学地理与环境学院环境变化研究所，牛津OX1 3QY ，英国，国家空间研究所（INPE）遥感部，巴西圣保罗圣何塞多斯坎普斯12227-010；波士顿大学地理与环境系，马萨诸塞州波士顿02215；国家航空生物圈科学分会和航天局/艾姆斯研究中心，莫菲特菲尔德，加利福尼亚州94035；％最近的亚马逊干旱已引起人们对热带森林易受气候变化影响的关注rbations。卫星和现场观测表明，干旱年份的火灾发生率增加，严重干旱后树木死亡，但是迄今为止，还没有评估这些干旱对亚马逊地区景观的长期影响。在这里，我们使用卫星微波对降雨和冠层后向散射的观测表明，在2005年的干旱季节，亚马逊河西部的超过7,000万公顷森林遭受了严重的缺水，冠层结构和湿度也相应下降。值得注意的是，尽管随后几年的总降雨量逐渐恢复，但冠层后向散射的下降一直持续到2010年下一次大旱灾。后向散射的下降归因于与森林上层冠层相关的结构和含水量的变化。低反向散射的持久性支持2005年严重干旱后森林冠层结构的缓慢恢复（> 4 y）。结果表明，亚马逊地区5-10 y频率的干旱可能导致森林冠层的持续变化。 。

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  • 作者

    Sassan Saatchi; Salvi Asefi-Najafabady; Yadvinder Malhi; Luiz E. O. C. Aragao; Liana O. Anderson; Ranga B. Myneni; Ramakrishna Nemani;

  • 作者单位

    Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109,Institute of Environment, University of California, Los Angeles, CA 90045;

    Institute of Environment, University of California, Los Angeles, CA 90045;

    Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford OX1 3QY, United Kingdom;

    College of Life and Environmental Sciences, University of Exeter, Devon EX4 4RJ, United Kingdom;

    Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford OX1 3QY, United Kingdom,Remote Sensing Division, National Institute for Space Research (INPE), Sao Jose dos Campos, Sao Paulo 12227-010, Brazil;

    Department of Geography and Environment, Boston University, Boston, MA 02215;

    Biospheric Sciences Branch, National Aeronautics and Space Administration/Ames Research Center, Moffett Field, CA 94035;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    radar; canopy water content; rainforest; QSCAT; canopy disturbance;

    机译：雷达;冠层含水量;雨林;QSCAT;冠层扰动;

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