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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Response of vegetation to drought time-scales across global land biomes
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Response of vegetation to drought time-scales across global land biomes

机译：全球陆地生物群落中植被对干旱时间尺度的响应

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摘要

We evaluated the response of the Earth land biomes to drought by correlating a drought index with three global indicators of vegetation activity and growth: vegetation indices from satellite imagery, tree-ring growth series, and Aboveground Net Primary Production (ANPP) records. Arid and humid biomes are both affected by drought and we suggest that the persistence of the water deficit (i.e., the drought time-scale) could be playing a key role in determining the sensitivity of land biomes to drought. We found that arid biomes respond to drought at short time-scales; that is, there is a rapid vegetation reaction as soon as water deficits below normal conditions occur. This may be due to the fact that plant species of arid regions have mechanisms allowing them to rapidly adapt to changing water availability. Humid biomes also respond todrought at short time-scales, but in this case the physiological mechanisms likely 'differ from those operating in arid biomes, as plants usually have a poor adaptability to water shortage. On the contrary, semiarid and subhumid biomes respond to drought at long time-scales, probably because plants are able to withstand water deficits, but they lack the rapid response of arid biomes to drought. These results are consistent among three vegetation parameters analyzed and across different land biomes, showing that the response of vegetation to drought depends on characteristic drought time-scales for each biome. Understanding the dominant time-scales at which drought most influences vegetation might help assessing the resistance and resilience of vegetation and improving our knowledge of vegetation vulnerability to climate change.
机译：通过将干旱指数与植被活动和生长的三个全球指标相关联，我们评估了地球陆地生物群落对干旱的响应：卫星图像，树木年轮生长系列和地上净初级生产力（ANPP）记录中的植被指数。干旱和潮湿的生物群落都受到干旱的影响，我们建议持续缺水（即干旱时间尺度）可能在决定陆地生物群落对干旱的敏感性方面起关键作用。我们发现干旱的生物群落在短时间内对干旱做出反应。也就是说，一旦出现低于正常条件的缺水，就会迅速发生植被反应。这可能是由于干旱地区的植物物种具有使它们迅速适应不断变化的水利用状况的机制这一事实。潮湿的生物群落也能在短时间内对干旱做出响应，但在这种情况下，生理机制可能与干旱生物群落中的生理机制有所不同，因为植物通常对缺水的适应性较差。相反，半干旱和半湿润的生物群落对干旱的反应时间长，这可能是因为植物能够抵御缺水，但它们缺乏干旱生物群落对干旱的快速反应。这些结果在所分析的三个植被参数之间以及在不同陆地生物群落中是一致的，表明植被对干旱的响应取决于每个生物群落的特征干旱时间尺度。了解干旱对植被影响最大的主导时间尺度可能有助于评估植被的抵抗力和复原力，并有助于我们了解植被对气候变化的脆弱性。

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    Sergio M. Vicente-Serrano; Celia Gouveia; Jesus Julio Camarero; Santiago Begueria; Ricardo Trigo; Juan I. L6pez-Moreno; Cesar Azorin-Molina; Edmond Pasho; Jorge Lorenzo-Lacruz; Jesus Revuelto; Enrique Moran-Tejeda; Arturo Sanchez-Lorenzo;

  • 作者单位

    Instituto Pirenaico de Ecologfa, Consejo Superior de Investigaciones Cientificas, 50059 Zaragoza, Spain;

    Centro de Geofisica Universidad de Lisboa, Institute) Dom Luiz,Faculdade de Ciencias, Universidade de Lisboa, 1749-016 Lisbon, Portugal,Escola Superior de Tecnologia, Institute Politecnico de Setubal, 2910-761 Setubal, Portugal;

    Fundaci6n Agenda Aragonesa para la Investigacion y Desarrollo-lnstituto Pirenaico de Ecologia, Consejo Superior de Investigaciones Cientif icas, 50059 Zaragoza,Spain;

    Estaci6n Experimental de Aula Dei, Consejo Superior de Investigaciones Cientificas, 50059 Zaragoza, Spain;

    Centro de Geofisica Universidad de Lisboa, Institute) Dom Luiz,Faculdade de Ciencias, Universidade de Lisboa, 1749-016 Lisbon, Portugal,Departamento de Engenharias, Universidade Lusofona, 1749-024 Lisboa, Portugal;

    Instituto Pirenaico de Ecologfa, Consejo Superior de Investigaciones Cientificas, 50059 Zaragoza, Spain;

    Instituto Pirenaico de Ecologfa, Consejo Superior de Investigaciones Cientificas, 50059 Zaragoza, Spain;

    Instituto Pirenaico de Ecologfa, Consejo Superior de Investigaciones Cientificas, 50059 Zaragoza, Spain;

    Instituto Pirenaico de Ecologfa, Consejo Superior de Investigaciones Cientificas, 50059 Zaragoza, Spain;

    Instituto Pirenaico de Ecologfa, Consejo Superior de Investigaciones Cientificas, 50059 Zaragoza, Spain;

    Instituto Pirenaico de Ecologfa, Consejo Superior de Investigaciones Cientificas, 50059 Zaragoza, Spain;

    Institute for Atmospheric and Climate Science, Eidgenossische Technische Hochschule Zurich, 8006 Zurich, Switzerland;

  • 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
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  • 关键词

    drought impacts; NDVI; drought adaptation; standardized precipitation evapotranspiration index; drought index;

    机译：干旱影响;NDVI;干旱适应标准化降水蒸散指数;干旱指数;

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