Urban stormwater ponds are important for flood protection and provide habitat for plants and animals in heavily sealed cities. Little is known about the diversity of plants in urban stormwater ponds and the vegetation composition is often influenced by sowing and planting. We analysed the re-colonisation of the vegetation in an urban stormwater pond, which was reconstructed to improve water retention. Specifically, we studied if the soil seed bank has the potential for re-colonising the pond. We analysed the standing vegetation from the year before until 2 years after reconstruction of a stormwater pond in Hamburg, Germany. Further, we analysed the soil seed bank in the year before and in the second year after reconstruction of the stormwater pond. We found 74 species in the soil seed bank in 2015 and 2017 with Juncus spp. and Epilobium spp. being the most dominant taxa. Our results indicate that urban stormwater ponds have the potential for re-colonisation out of seed bank and, thus, sowing is not a necessary management action in the reconstruction process.

中文翻译：

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重建后种子库有可能重新殖民城市雨水池

城市雨水池对于防洪很重要，并为严重封闭的城市中的动植物提供栖息地。对城市雨水池中植物的多样性知之甚少，植被组成通常受播种和种植的影响。我们分析了城市雨水池中植被的重新定植，该池经过重建以提高保水能力。具体来说，我们研究了土壤种子库是否有重新定殖池塘的潜力。我们分析了德国汉堡一个雨水池重建前一年到两年后的站立植被。此外，我们分析了雨水池改造前一年和后第二年的土壤种子库。2015 年和 2017 年，我们在土壤种子库中发现了 74 种 Juncus spp。和 Epilobium spp。成为最主要的分类群。我们的结果表明，城市雨水池有可能从种子库中重新定殖，因此，在重建过程中播种不是必要的管理措施。