globalchange  > 全球变化的国际研究计划
项目编号: 1562127
项目名称:
Collaborative Research: Forest Water Use and the Influence of Acid Deposition
作者: Matthew Vadeboncoeur
承担单位: University of New Hampshire
批准年: 2016
开始日期: 2016-06-01
结束日期: 2019-05-31
资助金额: 155259
资助来源: US-NSF
项目类别: Standard Grant
国家: US
语种: 英语
特色学科分类: Geosciences - Earth Sciences
英文关键词: acid deposition ; forest wue ; research ; fernow experimental forest ; water vapor ; forested catchment ; important greenhouse gas ; research finding ; unit water vapor loss ; forest soil ; forest water use efficiency
英文摘要: Forest Water Use Efficiency (WUE) is defined as the ratio of carbon uptake per unit water vapor loss via transpiration. Micrometeorological measurements suggest that forest WUE has dramatically increased over the last two decades, in excess of what would be expected from increases in atmospheric carbon dioxide concentrations. Coinciding with observed trends in forest WUE have been marked decreases in acid deposition throughout much of North America and Europe. There is evidence that acid deposition may impact forest WUE, either by altering the availability of nutrients in forest soils or by directly affecting foliar physiology. Changes in WUE could also lead to changes in stream discharge from forested catchments. The hypothesized response of forests to changing levels of acid deposition is not currently considered in the land surface components of global climate models (GCMs). Since carbon dioxide and water vapor are the two most important greenhouse gases, it is vital to accurately model their land-atmosphere exchange.

The proposed research uses a catchment-based approach to investigate the effects of changing acid deposition on forest WUE. Tree ring carbon isotopes will be used to reconstruct historical WUE time series within six catchments that have been differentially impacted by acid deposition due to distinctions between their underlying bedrock mineralogy and geological histories. The research will also capitalize on experimental treatments that have altered soil biogeochemistry in paired catchment designs (Bear Brook, ME; Hubbard Brook, NH; and Fernow Experimental Forest, WV). Stream discharge analysis and model-based approaches will be applied to detect the impact of acid deposition on forest WUE.

The project will support a Ph.D. student, who will receive training in a wide range of field, laboratory, and modeling techniques, and at least eight undergraduate students. High school students will also be involved through established programs, and will include their participation in both field and lab activities. All senior members of the project team have track records of recruiting students from underrepresented groups. Results will be communicated to the broader scientific community through journal publications and conference presentations, and a special conference session will be organized with an objective of sharing research findings with the modeling community.
资源类型: 项目
标识符: http://119.78.100.158/handle/2HF3EXSE/92116
Appears in Collections:全球变化的国际研究计划
科学计划与规划

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Matthew Vadeboncoeur. Collaborative Research: Forest Water Use and the Influence of Acid Deposition. 2016-01-01.
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