Soil Climate and its Control on wetland Carbon Balance in Interior Boreal Alaska: Experimental Manipulation of Thermal and Moisture Regimes

阿拉斯加内陆北方土壤气候及其对湿地碳平衡的控制：热和湿度状况的实验控制

• 批准号: 0425328
• 负责人: A. David McGuire
• 金额: $ 17.5万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-08-15 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0425328&HistoricalAwards=false
• 关键词: Soil; Climate; its; Control; wetland

In association with recent climatic warming in interior Alaska, water bodies in some wetland regions are drying (for example, the Yukon Flats), while other regions are becoming wetter (for example, the Tanana Flats). In a wetland located near Fairbanks, three plots will be established: (1) a non-manipulated control plot, (2) a plot that is ditched to lower the water table, and (3) a plot to which water is added to raise the water table. In sub-plots of each plot, insulation will be added during the winter to locally increase soil temperature. The net fluxes of carbon dioxide and methane will be measured regularly on these plots to quantify the dynamics and mechanisms responsible for the responses.Global warming is affecting much of the boreal forest region, a region which contains between ~30% of the world's soil carbon, much of it stored in wetlands. The response of the two most important greenhouse gases, carbon dioxide and methane, in boreal wetlands has the potential to alter the warming effects of these gases on climate. This study will improve the ability to quantify how responses of these gases may enhance or mitigate the warming effects of these gases on climate.

与阿拉斯加内陆最近的气候变暖有关，一些湿地地区的水体正在变干（例如，育空地区平原），而其他地区正在变得更加湿润（例如，塔纳纳平原）。 在位于费尔班克斯附近的湿地中，将建立三个地块：（1）非操纵对照地块，（2）挖沟降低地下水位的地块，以及（3）加水提高地下水位的地块。 在每个地块的子地块中，将在冬季添加绝缘材料，以局部提高土壤温度。在这些地块上将定期测量二氧化碳和甲烷的净通量，以量化响应的动力学和机制。全球变暖正在影响北方森林地区的大部分地区，该地区含有约30%的世界土壤碳，其中大部分储存在湿地中。 两种最重要的温室气体，二氧化碳和甲烷，在北方湿地的反应有可能改变这些气体对气候的变暖效应。 这项研究将提高量化这些气体的反应如何增强或减轻这些气体对气候的变暖效应的能力。