SURFACE LEVEL AND WATER TABLE FLUCTUATIONS IN A SUBARCTIC FEN
SURFACE LEVEL AND WATER TABLE FLUCTUATIONS IN A SUBARCTIC FEN
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亚北极沼泽地表水位和水位波动
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
N. Roulet
中科院分区：
文献类型：
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作者：
N. Roulet
1988 年 6 月初至 8 月中旬，测量了魁北克谢弗维尔附近亚北极沼泽地表水位的波动。在代表沼泽地三种不同地形单元的四个地点测量了地表水位、地下水位和解冻深度：平坦的中心区域；山丘、岛屿和山脊；和沼泽的周长。在沼泽中央部分测量到的地表水位每天变化几厘米，而山脊和周边区域的变化要小得多。周边和山脊位置的地表水平变化由解冻深度控制。中心区域的水位由蓄水量的变化控制。一个简单的水平衡模型足以预测沼泽中心区域地表水位的下降。然而，同一模型低估了地表水位的上升。即使在持续渗漏期间，沼泽中央区域的地表水平调整也会导致泥炭表面持续饱和。饱和度的恒定性对许多生物和非生物过程的速率和强度具有重要影响，例如痕量气体和蒸散的生物产生和消耗。
Fluctuations in the surface level of a subarctic fen, near Schefferville, Quebec, were measured from early June to mid-August 1988. Surface level, water table, and depth of thaw were measured at four sites representing three different topographic units of the fen: a flat central area; hummocks, islands and ridges; and the fen perimeter. Surface level changes of several centimeters a day were measured in the central portion of the fen, while the change was much less in the ridge and perimeter areas. Change in surface level at the perimeter and ridge sites was controlled by the depth of thaw. Levels of the central area were controlled by changes in water storage. A simple water balance model adequately predicted the lowering of the surface level of the central area of the fen. However, the same model underestimated rising surface levels. The adjusting surface level in the central area of the fen lead to a constantly saturated peat surface even during periods of persistent exfiltration. The constancy of saturation has important implications on the rate and magnitude of many biotic and abiotic processes, such as the biogenic production and consumption of trace gases and evapotranspiration.