Ephemeral floodplain lakes are an integral component of inland wetland ecosystems and experience highly variable hydrology and prolonged dry periods. Although wetland soil seed banks are highly resilient to drought and floods, anthropogenic land use may add an additional stress. Understanding the recovery potential of wetland soil seed banks to different historical land uses helps manage and prioritise environmental water. In this study we explored the resilience of the wetland plant community in an ephemeral floodplain lake (Ita Lake, NSW, Australia). We collected soil samples during an extended dry phase (10 years) from two distinct zones within the lake, one of which was subjected to historical grazing and the other to lakebed ploughing and cropping. The samples were inundated under multiple inundation regimes to assess soil seed bank response. We found that the soil seed bank was viable, indicating a level of resilience not previously recorded for some plant species, namely Ricciocarpus natans, Chara spp., Nitella spp., Alternanthera denticulata and Eleocharis acuta. Although the results highlight the resilience of ephemeral wetland plant communities, intensive land uses such as ploughing and cropping will limit the availability of seeds to germinate, and the inundation regime will influence species composition and the subsequent likelihood of restoration.

中文翻译：

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受种植、放牧和长期干旱影响的洪泛区湖泊中原生土壤种子库的恢复力

短暂的漫滩湖泊是内陆湿地生态系统的一个组成部分，水文变化很大，干旱期延长。尽管湿地土壤种子库对干旱和洪水具有很强的弹性，但人为土地使用可能会增加额外的压力。了解湿地土壤种子库对不同历史土地用途的恢复潜力有助于管理和优先考虑环境水。在这项研究中，我们探索了一个短暂的洪泛平原湖（澳大利亚新南威尔士州伊塔湖）中湿地植物群落的恢复能力。我们在长期干旱期（10 年）期间从湖内两个不同区域收集了土壤样本，其中一个区域进行了历史放牧，另一个进行了湖床耕作和种植。样品在多种淹没方式下被淹没，以评估土壤种子库的反应。我们发现土壤种子库是可行的，这表明某些植物物种（即 Ricciocarpus natans、Chara spp.、Nitella spp.、Alternanthera denticulata 和 Eleocharis acuta）具有以前未记录的恢复力水平。尽管结果强调了短暂湿地植物群落的恢复能力，但耕作和种植等集约化土地利用将限制种子发芽的可用性，并且淹没状况将影响物种组成和随后的恢复可能性。