Aberg Jan, Bergström Ann-Kristin, Algesten Grete, Söderback Kenneth, Jansson Mats
Department of Ecology and Environmental Science, Umea University, Umea SE-901 87, Sweden.
Water Res. 2004 Feb;38(3):531-8. doi: 10.1016/j.watres.2003.10.035.
Carbon balances were calculated for the summer stratification period of 2001 for the hydroelectric reservoir L. Skinnmuddselet (created in 1989) and the natural L. Orträsket, and estimated on annual basis for both lakes. The reservoir and the lake have similar chemical characteristics and are located in adjacent catchments in the northern part of Sweden. Our main hypothesis was that the CO(2) production and emissions from the reservoir, L. Skinnmuddselet, would be greater than in the natural L. Orträsket, due to the decomposition of flooded vegetation and peat. The carbon balances showed that the total production of CO(2) per unit lake surface area during the summer was very similar in the natural lake and the reservoir (31.3 g Cm(-2) in L. Orträsket and 25.3 g Cm(-2) in L. Skinnmuddselet). The sediments were the major CO(2) source in the reservoir, while most of the mineralization in the natural lake occurred in the water column. On annual basis the natural L. Orträsket produced and emitted more CO(2) per unit of lake surface area than the reservoir L. Skinnmuddselet since mineralization proceeded during winter when L. Skinnmuddselet was emptied for electricity production. Therefore, the potential for CO(2) emission was not greater in the reservoir than in the natural lake.
计算了2001年夏季分层期水电水库斯金穆德塞湖（1989年建成）和天然的奥尔特拉什湖的碳平衡，并对两个湖泊进行了年度估算。该水库和湖泊具有相似的化学特征，位于瑞典北部相邻的集水区。我们的主要假设是，由于淹没植被和泥炭的分解，斯金穆德塞湖水库的二氧化碳产生和排放将高于天然的奥尔特拉什湖。碳平衡表明，夏季单位湖泊表面积的二氧化碳总产生量在天然湖泊和水库中非常相似（奥尔特拉什湖为31.3 g Cm⁻²，斯金穆德塞湖为25.3 g Cm⁻²）。沉积物是水库中主要的二氧化碳来源，而天然湖泊中的大部分矿化作用发生在水柱中。从年度来看，由于冬季斯金穆德塞湖为发电而排空时矿化作用仍在进行，天然的奥尔特拉什湖单位湖泊表面积产生和排放的二氧化碳比水库斯金穆德塞湖更多。因此，水库的二氧化碳排放潜力并不比天然湖泊大。
