LTREB Renewal: Biogeochemical Mechanisms of Response in the Third Decade of Whole-Ecosystem Experimental Manipulations at the Bear Brook Watershed in Maine (BBWM)

LTREB 更新：缅因州熊溪流域第三个十年全生态系统实验操作的生物地球化学响应机制 (BBWM)

• 批准号: 1119709
• 负责人: Ivan Fernandez
• 金额: $ 44.89万
• 依托单位: University of Maine
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-01-15 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1119709&HistoricalAwards=false
• 关键词: LTREB; Renewal; Biogeochemical; Mechanisms; Response

Research at the Bear Brook Watershed in Maine has been conducted for more than 25 years on the effects of atmospheric sulfur and nitrogen deposition on forest, soils, and stream runoff, in a changing climate. Each watershed includes a headwater stream. One watershed is treated bimonthly by helicopter (simulating atmospheric sulfur and nitrogen deposition) and the other is an untreated reference. This project will support the third decade of research, which explores new ecological response mechanisms that can only be investigated by long-term, multi-decadal research. The broader impacts of this project include the training of undergraduate and graduate students. This research also provides direct evidence of whole-ecosystem responses to chemical treatments that simulate air pollutants, providing results not possible from controlled laboratory studies. This research has identified and verified key factors governing forest response to sulfur and nitrogen deposition, and revealed major gaps in our understanding that are critical to determining the success of current and future influences of the Clean Air Act. Societal concerns about the effects of acid deposition, reactive nitrogen, and climate change on forest ecosystem services grow increasingly important. This research directly addresses those information needs for today and the future.

在缅因州的熊溪流域进行的研究已经超过25年，在不断变化的气候条件下，大气硫和氮沉积对森林，土壤和溪流径流的影响。每个分水岭包括一条源头河流。其中一个流域每两个月由直升机处理一次（模拟大气硫和氮沉积），另一个流域是未经处理的参考。该项目将支持第三个十年的研究，探索新的生态反应机制，只能通过长期的，几十年的研究进行调查。该项目的更广泛影响包括培训本科生和研究生。这项研究还提供了整个生态系统对模拟空气污染物的化学处理反应的直接证据，提供了控制实验室研究不可能获得的结果。这项研究确定并验证了森林对硫和氮沉降反应的关键因素，并揭示了我们理解的主要差距，这些差距对于确定《清洁空气法》当前和未来影响的成功至关重要。酸沉降、活性氮和气候变化对森林生态系统服务的影响日益受到社会关注。这项研究直接解决了今天和未来的信息需求。

项目成果

14 C mean residence time and its relationship with thermal stability and molecular composition of soil organic matter: A case study of deciduous and coniferous forest types

14℃平均停留时间及其与热稳定性和土壤有机质分子组成的关系：以落叶林和针叶林类型为例

• DOI: 10.1016/j.geoderma.2017.08.023
• 发表时间: 2017
• 期刊: Geoderma
• 影响因子: 6.1
• 作者: Ohno, Tsutomu;Heckman, Katherine A.;Plante, Alain F.;Fernandez, Ivan J.;Parr, Thomas B.
• 通讯作者: Parr, Thomas B.