Hardwood floodplain (HF) forests can store a considerable amount of carbon (C), and floodplains may be good candidates for reforestation to provide natural C sinks. In this study, we use nondestructive inventory methods to estimate the C stocks of different tree species and C pools within HF forests of varying age and structure and located at sites differing in hydrological conditions (low and high active floodplain, seepage water zone, tributaries). The study was carried out along the Elbe river (Germany). Average C stocks for young plantations in the active floodplain were significantly lower (50.2 ± 10.8 SE Mg ha⁻¹) than those of old dense (140.6 ± 11.6 SE Mg ha⁻¹) and old sparse forests (180.4 ± 26.6 SE Mg ha⁻¹) with comparable hydrological conditions. C stocks of old dense forests did not significantly vary from old sparse forests. Additionally, C stocks of old forests did not significantly vary according to hydrological conditions. The highest amount of C was stored in Quercus robur for all hydrological conditions. Ulmus laevis stored the second-highest amount of C on the active floodplain. We conclude that sparse and dense forests as well as forests under different hydrological conditions provide the same C storage function.

中文翻译：

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易北河中游阔叶阔叶林碳储量：森林年龄，结构，物种和水文条件的影响

硬木洪泛区（HF）森林可以储存大量的碳（C），洪泛区可能是重新造林以提供天然C汇的良好候选者。在这项研究中，我们使用非破坏性清查方法来估算不同年龄和结构的HF森林中不同树种和碳库的碳库，这些森林位于水文条件不同的地点（低洪泛区和高洪泛区，渗水带，支流） 。该研究是在易北河（德国）上进行的。在有源漫滩为年轻种植园的平均C原液显著降低（50.2±10.8 SE镁公顷^-1）比旧的密（140.6±11.6 SE镁公顷的^-1）和旧稀疏林（180.4±26.6 SE镁公顷^{- 1个}）具有可比的水文条件。旧的茂密森林的碳储量与旧的稀疏森林没有显着差异。此外，根据水文条件，旧森林的碳储量没有显着变化。在所有水文条件下，最高量的C被储存在栎树中。榆（Ulmus laevis）在活跃的泛滥平原上储存了第二高的碳。我们得出的结论是，稀疏和茂密的森林以及处于不同水文条件下的森林都具有相同的碳存储功能。