Growth of Common Brackish Marsh Macrophytes Under Altered Hydrologic and Salinity Regimes

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• 作者：Rebecca J. Howard ; Janelda Biagas ; Larry Allain
• 关键词：Brackish marsh ; Climate change ; Environmental stressors ; Hydrology ; Plant growth ; Salinity
• 刊名：Wetlands
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：36
• 期：1
• 页码：11-20
• 全文大小：530 KB
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• 作者单位：Rebecca J. Howard (1)
  Janelda Biagas (1)
  Larry Allain (1)
  
  1. U.S. Geological Survey, National Wetlands Research Center, Lafayette, LA, 70506, USA
  
• 刊物主题：Freshwater & Marine Ecology; Environmental Management; Ecology; Hydrogeology; Coastal Sciences; Landscape Ecology;
• 出版者：Springer Netherlands
• ISSN：1943-6246

文摘

Coastal marsh plants are increasingly subject to physicochemical stressors under rising sea levels, and the maintenance of marsh ecological functions can depend on the ability of individual species and communities to tolerate or adapt to altered conditions. We conducted a greenhouse experiment to identify hydrology and salinity effects on growth of three common brackish marsh macrophytes of coastal Florida, USA: Distichlis spicata, Juncus roemerianus, and Spartina bakeri. The species were potted as monocultures and exposed to three salinities (0, 15, or 28 psu) and two hydrologic conditions (saturated, tidal) over 22 months. Final stem density of J. roemerianus and S. bakeri did not differ among treatments. In D. spicata, however, stem density was lowest at 28 psu and lower in tidal compared to saturated conditions. Mean stem height of all species was lowest at 28 psu. Aboveground biomass of J. roemerianus was not affected by the treatments, but in D. spicata and S. bakeri it was lowest at 28 psu. Results indicated that J. roemerianus was the most adaptable species and may, therefore, be more resilient to climate-change driven stressors. However, plant-plant interactions such as interspecific competition and facilitation can alter the response of individual species to environmental factors. Keywords Brackish marsh Climate change Environmental stressors Hydrology Plant growth Salinity