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

随着最近阿拉斯加内陆气候变暖，一些湿地地区的水体正在变干(例如育空平原)，而其他地区正在变得更加潮湿(例如塔纳纳平原)。在费尔班克斯附近的湿地，将建立三个地块：(1)非人工控制地块，(2)为降低地下水位而开挖的地块，(3)为提高地下水位而加水的地块。在每一块地块的小块土地上，冬季将增加隔热材料，以局部提高土壤温度。这些地块将定期测量二氧化碳和甲烷的净通量，以量化造成反应的动力学和机制。全球变暖正在影响北方森林地区的大部分地区，该地区含有世界上约30%的土壤碳，其中大部分储存在湿地。最重要的两种温室气体二氧化碳和甲烷在北部湿地的反应可能会改变这些气体对气候变暖的影响。这项研究将提高量化这些气体的反应如何增强或缓解这些气体对气候变暖影响的能力。

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.