Incorporating thresholds into understanding salinity tolerance: A study using salt‐tolerant plants in salt marshes |
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| Authors: | Qiang He Brian R Silliman Baoshan Cui |
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| Affiliation: | 1. School of Environment, State Key Laboratory of Water Environment Simulation, Beijing Normal University, Beijing, China;2. Division of Marine Science and Conservation, Nicholas School of the Environment, Duke University, Beaufort, NC, USA |
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| Abstract: | Although salinity in many ecosystems such as salt marshes can be extremely high, an asymmetry in salinity range between experimental studies (relatively narrow) and field conditions (potentially broad) has strongly affected current understanding of plant salinity tolerance. To improve understanding, it is thus important to examine plant tolerances over a broad range of salinities and identify potential tolerance thresholds. We examine tolerances of two widely distributed marsh plants, Suaeda salsa and Salicornia europaea, to salinities ranging from 0 to 100 g/kg, and determine survival, above‐ and belowground biomass after 8 weeks of salinity treatment. Both species, Sa. europaea in particular, have much broader salinity tolerances than other plants previously examined, (2) plant survival, above‐ and belowground biomass have remarkably different responses to salinity, and (3) there is a nonlinear, threshold response of S. salsa to salinity, above which S. salsa survivorship drastically decreases. These results provide multiple important insights. Our study suggests that the potential for using these halophytes to revegetate and restore salt‐affected land may be greater than previously thought, and highlights the importance of studying multiple plant responses. Importantly, our study calls for a better integration of thresholds into understanding plant salinity tolerances and their applications. |
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| Keywords: | coastal wetlands nonlinear ecological processes
Salicornia europaea
salt marsh soil salinity
Suaeda salsa
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