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Degradation of native and exotic riparian plant leaf litter in a floodplain pond

机译：洪泛区池塘中原生和外来河岸植物叶片凋落物的降解

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1. A litter-bag experiment was undertaken in a pond on the margins of a large temperate floodplain in south-western France to assess the potential influence of the replacement of native by exotic riparian species on organic matter degradation. We determined initial litter chemical composition, breakdown rates and the invertebrate assemblages associated with the litter for five pairs of native dominant and exotic invasive species co-occurring at different stages along a successional gradient.2. Litter chemical composition, breakdown rates and abundance and diversity of detritivorous invertebrates were similar for the exotic and native species overall. No overall changes in organic matter degradation can thus be predicted from the replacement of dominant natives by exotic invasives. Breakdown rates were primarily driven by the C/N ratio.3. One invasive species (Buddleja davidii) showed significantly higher breakdown rates than its native counterpart (Populus nigra), resulting in the disappearance of leaf litter 6 months prior to the next litterfall. In some cases, therefore, invasion by exotic species may result in discontinuity of resource supply for decomposers.
机译：1.在法国西南部的一个大温带洪泛平原的边缘的池塘中进行了一个垃圾袋试验，以评估外来河岸物种替代本地物种对有机物降解的潜在影响。确定了5个沿演替梯度在不同阶段同时发生的本土优势和外来入侵物种对的初始凋落物化学成分，分解速率和与凋落物相关的无脊椎动物组合。2。整体而言，外来物种和本土物种的凋落物化学成分，分解率以及有害无脊椎动物的丰富度和多样性相似。因此，无法通过外来入侵物替代优势本地人来预测有机物降解的总体变化。故障率主要由C / N比驱动。3。一种入侵种（Buddleja davidii）显示出比其天然对应种（黑杨）更高的分解率，导致下一次凋落前六个月叶片凋落物的消失。因此，在某些情况下，外来物种的入侵可能会导致分解者资源供应中断。

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