Effects of sap flow in vascular plants on the small change in ground water level in a peat mire.

泥炭沼泽中的地表水对泥炭沼泽的管理和土地利用非常重要。本研究的目的是为了弄清地下水位变化与非饱和次表层含水率和沼泽中维管植物树干液流的关系。树干液流白天向上流动，其强度与图奇盖米地区的太阳辐射有很好的线性关系。几种情况下，树干液流在夜间向下流动。地下水位的有效每小时偏差(EHD)，定义为地下水位减去渗漏分量的实际偏差，根据蒸散量在白天为负值。EHD在白天的变化大致对应于太阳辐射的变化，具有1-2小时的时间滞后。在Sum…夜间，地下水位的ehd转为正值。更多的情况表明，地下水在夜间来自上层、非饱和次表层和/或植被层。夜间EHD变为正值与植物液流下降同时发生，说明地下水位的小幅上升与植物体内的水分流动有关，不仅与维管束中的水分有关，还与水华中的水分有关。在一次降雨后和夜间，泥炭次表层中的水在饱和层和非饱和层之间发生了重新分配。泥炭层中水分的重新分配可能是高泥炭沼泽地下水位小幅上升的主要原因。Sarobetsu Mire泥炭层中碳、氮、钠、钙、硅等元素的详细分布表明，泥炭层中的化学成分从表层到约4m深度均匀分布。这意味着淤泥中的水系在很长一段时间内是稳定的。泥炭中水分的重新分配可能有助于泥炭的稳定。较少

Surface ground water in a peat mire is very important for management and land use of the mire. The aim of this study is to make clear the relationship between change of ground water level and water content in the unsaturated subsurface layer and sap flow in the vascular plants growing in the mire. The direction of sap flow was upward in the daytime, and strength of the flow had a good linear relation with solar radiation in the Tukigaumi. The direction of sap flow was downward during the night in several cases. The direction changed to downward just before sunset and changed again to upward the next morning.The effective hourly deviation (EHD) in ground water level, defined as the actual deviation in ground water level minus seepage component, was negative in the day time according to evapotranspiration. Changes in EHD during the daytime roughly corresponded to changes in solar radiation with a time lag of 1-2 hours. The EHD of ground water level became positive during the night in som … More e cases, indicating that ground water was supplied from the upper layer, the unsaturated subsurface layer and/or vegetation layers during the night. The change of EHD to positive during the night occurred simultaneously with downward sap flow in the plant, suggesting that the small rise in ground water level during the is related to the water flow in plants, not only in vascular plants but also in sphagnum. The redistribution of water between the saturated layer and unsaturated layer in a sphagnum peat subsurface layer was found after a rainfall and during the night. This redistribution of water in a peat layer is probably main reason of small rise in ground water level in a high peat mire. A detail profile of C, N, Na, Ca, Si etc. in a Sphagnum peat layer in Sarobetsu Mire showed that the chemical composition distributed evenly from surface to around 4 m in depth. This fact means that the water system in the mire was stable very long time. The redistribution of water in a sphagnum peat might contribute to the stability of the mire. Less