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Submersed macrophyte growth at low pH : II. CO2 × sediment interactions
1Department of Biological Sciences, State University of New York, 13902, Binghamton, NY, USA.
Oecologia
|March 18, 2017
Summary
Carbon dioxide (CO2) enrichment significantly boosts Vallisneria americana growth across various sediments. Sediment type influences biomass accumulation, but CO2
Area of Science:
- Aquatic Botany
- Plant Physiology
- Environmental Science
Background:
- Submersed aquatic plants play crucial roles in freshwater ecosystems.
- Understanding factors influencing their growth is vital for ecological management.
- Low pH conditions can limit aquatic plant productivity.
Purpose of the Study:
- To investigate the impact of carbon dioxide (CO2) enrichment on Vallisneria americana growth across different sediment types at low pH.
- To determine if sediment composition affects the plant's response to CO2 enrichment.
- To assess the influence of sediment fertility and potential toxicity on growth.
Main Methods:
- Greenhouse cultivation of Vallisneria americana for seven weeks.
- Exposure to ambient and elevated CO2 concentrations (10x ambient).
- Comparison of plant growth and biomass accumulation on three distinct sediment types (acidified, oligotrophic, and alkaline lake sediments).
Main Results:
- Plants exhibited a 21- to 24-fold increase in biomass with CO2 enrichment, regardless of sediment type.
- Biomass accumulation varied significantly with sediment, with alkaline sediment supporting the most growth.
- Plants on less fertile sediments allocated more resources to horizontal growth (stolons).
Conclusions:
- CO2 availability is a key regulator of submersed macrophyte growth at low pH.
- Sediment type influences overall biomass but not the proportionate response to CO2 enrichment.
- Nutrient limitation or aluminum toxicity were not the primary drivers of sediment-specific growth differences.
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