LTREB Renewal at Hubbard Brook: Hydrologic-nutrient cycle interaction in small, undisturbed and human-manipulated ecosystems

哈伯德布鲁克的 LTREB 更新：小型、未受干扰和人类操纵的生态系统中的水文-养分循环相互作用

• 批准号: 1256696
• 负责人: Gene Likens
• 金额: $ 45万
• 依托单位: Cary Institute of Ecosystem Studies, Inc.
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-03-01 至 2020-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1256696&HistoricalAwards=false
• 关键词: LTREB; Renewal; Hubbard; Brook; Hydrologic

The records of precipitation and stream water amount and chemistry collected at the Hubbard Brook Experimental Forest in the White Mountains of New Hampshire are now the longest continuous biogeochemical records of this type in the world. As such, they represent a treasure trove of information relevant to current environmental problems, such as acid rain, nitrogen deposition, forest growth, and rising levels of atmospheric carbon dioxide. The first five years of this decadal project focused primarily on the effect of disturbance and environmental change, including the continued decline in acid rain and the changing climate within the Hubbard Brook Valley. A number of surprises have emerged, including the disappearance of an early climate change effect on stream water temperature, decreased ice cover duration on Mirror Lake, and the impacts of acid rain on soil chemical changes that are now affecting forest growth. A major surprise seen from a synthesis and extrapolation of long-term trends in precipitation and stream water chemistry was that a relentless dilution of surface waters is occurring throughout the Hubbard Brook Valley and that surface waters are likely to approximate demineralized (extremely dilute) water in the near future. This suggests that future baseline conditions may be more dilute than thought for the time before the industrial revolution, apparently because of the depletion of soil nutrients by acid rain and the impacts of federal air pollution regulations on precipitation chemistry. This has important implications for the structure, function and management of northern hardwood forests and their associated aquatic ecosystems in the near future. It is expected that important answers to many of the questions pursued during the past five years will be obtained or made clearer during the final five years of this long-term project.For researchers and decision makers grappling with solutions to major environmental issues, such carefully documented and synthesized, long-term data are essential for providing an accurate and quantitative perspective on chemical changes in our atmosphere and in our forest and aquatic ecosystems, as well as to advance the theoretical underpinnings of ecology. In addition, numerous students are engaged in this research and the data are made freely available for other uses.

在新罕布什尔州怀特山的哈伯德溪实验森林中收集的降水量和溪流水量和化学的记录现在是世界上这种这种类型的最长连续生物地球化学记录。因此，它们代表了与当前环境问题有关的信息，例如酸雨，氮沉积，森林生长以及大气二氧化碳的上升水平。 该际际项目的头五年主要集中在干扰和环境变化的影响上，包括酸雨的持续下降以​​及哈伯德溪谷内的气候变化。 出现了许多惊喜，包括早期气候变化对溪流温度的消失，镜湖上的冰盖持续时间减少，以及酸雨对现在影响森林生长的土壤化学变化的影响。 从降水和溪流水化学中的长期趋势的合成和外推出来的一个重大惊喜是，整个Hubbard Brook Valley都在不断稀释地表水稀释，而地表水很可能在不久的将来近似脱水（极度稀释）水。 这表明，未来的基线条件可能比工业革命之前的时间更稀释，这显然是由于酸雨耗尽了土壤养分以及联邦空气污染法规对降水化学的影响。 这对不久的将来的北部硬木森林及其相关的水生生态系统的结构，功能和管理具有重要意义。 可以预期，在过去五年中提出的许多问题的重要答案将在这个长期项目的最后五年中得到或清晰。对于研究人员和决策者，努力解决重大环境问题的解决方案，这样的经过证实和合成的解决方案，长期的数据对于我们的森林和水库的准确和定量的观点是必不可少的。生态学。 此外，许多学生参与了这项研究，并免费提供数据可用于其他用途。