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Floodplain forest foundation species Salix alba L. is resilient to seawater pulses during winter
Markus-Michalczyk, H.; Smith, Z.; Bouma, T. (2024). Floodplain forest foundation species Salix alba L. is resilient to seawater pulses during winter. Limnological Review 24(3): 250-265. https://dx.doi.org/10.3390/limnolrev24030015
In: Limnological Review. International Publishing Service: Torun. ISSN 1642-5952, meer
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| Author keywords |
Salix alba; downstream riverine reaches; seawater pulses; flooding risk; nature-based solution |
| Auteurs | | Top |
- Markus-Michalczyk, H., meer
- Smith, Z.
- Bouma, T., meer
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| Abstract |
(1) Background: Willow forests are well established as nature-based solutions contributing to flood protection in the riverine environment. With climate change, storm surges in winter may increasingly expose downstream floodplain forests to seawater pulses. The effects of seawater pulses on willows are unknown, as previous studies focused on long-term exposure effects. (2) Methods: We studied the resilience of the floodplain forest foundation species Salix alba L. to seawater pulses during winter. This corresponds to the effects of storm surges in the North Sea region on floodplain willow trees in downstream river stretches during their dormant stage. Seawater pulses were applied from November to May on vegetative propagules. The plants were placed on flooding stairways at three levels in a mesocosm experiment under ambient conditions in Zealand, NL. (3) Results: Twice-applied 48 h seawater pulses during winter led to increasing salinity in the soil where vegetative propagules were placed. Ninety-five percent of the plants developed leaves, shoots, and roots, and juvenile trees were established in the following spring. Although the aboveground and belowground dry masses decreased with increasing short-term seawater flooding, they increased from April to May. (4) Conclusions: The seawater pulse caused a growth-delaying effect in the young experimental propagation plants of Salix alba. Contrary to earlier findings on the growth-inhibiting effects on S. alba under long-term salinity treatments, we show that S. alba is resilient to short-term seawater pulses experienced during the dormant (winter) stage. This is good news for the inclusion of S. alba in nature-based flood defense schemes in downstream riverine stretches. |
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