Feng Wenlan, Mariotte Pierre, Xu Ligang, Bragazza Luca, Buttler Alexandre, Cheng Junxiang, Santonja Mathieu
National key Laboratory of Lake and Watershed Science for Water Security Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences Nanjing China.
State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science, Chinese Academy of Sciences Nanjing China.
Ecol Evol. 2025 May 6;15(5):e71395. doi: 10.1002/ece3.71395. eCollection 2025 May.
Alteration of flooding regimes due to global change may have cascading effects on plant community composition and associated ecosystem services. Here, we experimentally investigated the effects of six flooding regimes with contrasting combinations of flooding duration (5.5, 6 and 6.5 months) and submergence rate (from 3.3 to 17.5 cm/day) on the growth and reproductive traits of , a dominant plant species of the Poyang Lake wetland in southern China. The time span of this study included a summer flooding event and the following growing seasons (autumn of first year and spring of following year) before the return of the next flooding event. The six flooding treatments affected plant traits during the flooding and the following growing seasons, but the different submergence rates under the same flooding duration did generally not show significant influence on plant traits. The 6.5-month flooding treatments had many fewer old (0.4 on average) and new stems (1 on average) than the 5.5-month treatments (8.3 and 29 stems, respectively) at the end of the flooding. The treatments with 5.5 months of flooding had 23% more stems than the other treatments and 26% more community biomass than the 6-month flooding treatments during the autumn growing season. The effects of summer flooding persisted in spring of the following year, but with an opposite trend of growth traits response to flooding treatments compared to autumn. In addition, the 6-month flooding treatments induced a higher number of inflorescences (39) than the 5.5-month (22) and 6.5-month floods (3). Altogether, our findings highlighted the important legacy effects of summer flooding with some trade-offs between growth recovery (autumn) and resilience (following spring) and between resource allocation to biomass production in autumn and resource allocation to sexual reproduction in the following spring, that were both mediated by flooding duration.
全球变化导致的洪水情势改变可能会对植物群落组成及相关生态系统服务产生级联效应。在此，我们通过实验研究了六种洪水情势（其洪水持续时间[5.5、6和6.5个月]与淹没速率[3.3至17.5厘米/天]的组合各不相同）对中国南方鄱阳湖湿地的优势植物物种[具体植物物种未给出]生长和繁殖性状的影响。本研究的时间跨度包括一次夏季洪水事件以及在下一次洪水事件到来之前随后的生长季节（第一年秋季和次年春季）。这六种洪水处理方式在洪水期间及随后的生长季节影响了植物性状，但在相同洪水持续时间下不同的淹没速率通常对植物性状未显示出显著影响。在洪水结束时，6.5个月的洪水处理方式的老茎（平均0.4个）和新茎（平均1个）比5.5个月的处理方式（分别为8.3个和29个茎）少得多。在秋季生长季节，5.5个月洪水的处理方式比其他处理方式的茎多23%，群落生物量比6个月洪水的处理方式多26%。夏季洪水的影响在次年春季仍然存在，但与秋季相比，生长性状对洪水处理的响应趋势相反。此外，6个月洪水的处理方式诱导产生的花序数量（39个）高于5.5个月（22个）和6.5个月洪水（3个）的处理方式。总之，我们的研究结果突出了夏季洪水的重要遗留效应，在生长恢复（秋季）和恢复力（次年春季）之间以及秋季生物量生产的资源分配和次年春季有性繁殖的资源分配之间存在一些权衡，这些均由洪水持续时间介导。
