LTREB Renewal: Multidecadal performance of tropical rainforest canopy trees - climate change, disturbance, and ontogeny

LTREB 更新：热带雨林冠层树木的多年代表现 - 气候变化、干扰和个体发育

• 批准号: 1147367
• 负责人: Deborah Clark
• 金额: $ 44.15万
• 依托单位: University of Missouri-Saint Louis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-02-01 至 2018-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1147367&HistoricalAwards=false
• 关键词: LTREB; Renewal; Multidecadal; performance; tropical

Detecting and measuring the impacts of climatic changes on tropical rainforests requires long records of careful annual measurements. Given that tropical forest may harbor 25% of the planet's terrestrial carbon, understanding the effects of changing climate on tropical rainforest trees has global significance. Since 1983, annual growth and survival have been measured for diverse canopy tree species in a lowland tropical rainforest at La Selva, Costa Rica. A major discovery revealed by these unique long-term records is that tropical rainforest tree growth has been slowed by very small increases in yearly temperatures. This five-year project renewal, which will bring the total period spanned by the La Selva measurements to 33 years, will greatly increase scientific understanding of the impacts of warming and of other potentially changing climatic factors on tropical rainforest trees.This study is the longest investigation of annual tropical rainforest performance worldwide. Unprecedented high temperatures are projected to affect all tropical regions in coming years. This study will make it possible to measure directly how tropical trees are responding to these changing conditions. This project has significant societal relevance, as productivity declines by these carbon-rich forests could translate into large carbon-dioxide emissions from the world tropics, thus accelerating global warming. Data from this project are freely available through publication in Ecological Archives. The investigators also maintain a very active program of public outreach.

要探测和测量气候变化对热带雨林的影响，就需要每年进行仔细测量，并进行长期记录。鉴于热带森林可能含有地球陆地碳的25%，了解气候变化对热带雨林树木的影响具有全球意义。自1983年以来，每年的增长和生存已被测量的不同树冠树种在低地热带雨林在拉塞尔瓦，哥斯达黎加。 这些独特的长期记录揭示了一个重大发现，即热带雨林树木的生长因年气温的微小上升而减缓。这一为期五年的项目更新将使La Selva测量的总周期达到33年，这将大大提高对变暖和其他潜在变化的气候因素对热带雨林树木影响的科学认识。预计在未来几年里，前所未有的高温将影响所有热带地区。 这项研究将使直接测量热带树木如何应对这些变化的条件成为可能。 该项目具有重大的社会意义，因为这些富碳森林的生产力下降可能转化为世界热带地区的大量二氧化碳排放，从而加速全球变暖。该项目的数据可通过生态档案馆的出版物免费获得。调查人员还保持着一个非常积极的公共宣传方案。