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了25年以上在气候变化的气候下，对大气硫和氮沉积对森林，土壤和溪流径流的影响。每个流域都有一个源头流。一个流域通过直升机（模拟大气硫和氮的沉积）进行一两个分水岭，而另一种是未经处理的参考。该项目将支持研究的第三个研究，该研究探讨了只能通过长期多年研究的新生态反应机制进行研究。该项目的更广泛影响包括对本科生和研究生的培训。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的反应的直接证据，从受控实验室研究中不可能进行结果。这项研究已经确定并验证了有关森林对硫和氮沉积反应的关键因素，并揭示了我们理解中的主要差距，这对于确定《清洁空气法》当前和未来影响的成功至关重要。社会对酸沉积，反应性氮和气候变化对森林生态系统服务的影响的关注越来越重要。这项研究直接解决了当今和未来的信息需求。

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.