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Updated: Jul 11, 2026
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Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer
Published on: July 26, 2024
Methane efflux from lake sediments through water lilies
Science (New York, N.Y.)
|March 23, 1979
Summary
Water lilies release methane and carbon dioxide from their rhizomes in spring. These gases accumulate in winter and are expelled through emerging leaves as the plant grows.
Area of Science:
- Plant physiology
- Aquatic botany
- Biogeochemistry
Background:
- Water lilies (Nymphaeaceae) exhibit unique adaptations for survival in aquatic environments.
- Rhizome lacunae in water lilies play a role in gas exchange and buoyancy.
- Seasonal gas dynamics in aquatic plants are crucial for understanding wetland ecosystems.
Purpose of the Study:
- To investigate the seasonal gas composition and release mechanisms in water lily rhizomes.
- To quantify the contribution of methane and carbon dioxide to gas release.
- To understand the pathway of gas transport from rhizome to atmosphere.
Main Methods:
- Analysis of gas composition within water lily rhizome lacunae during winter.
- Observation of gas bubble release from emerging leaves in spring.
- Tracking of gas movement (methane) through plant tissues during summer.
Main Results:
- Rhizome lacunae gases equilibrate with sediment water gases during winter.
- Significant bubble streams, containing up to 37% methane and 6% carbon dioxide, are released in spring.
- Methane uptake by roots and rhizomes in summer leads to atmospheric release via emergent leaves.
Conclusions:
- Water lily rhizomes act as reservoirs for gases, primarily methane and carbon dioxide, during winter.
- The internal pressure buildup drives gas expulsion in spring, contributing to methane cycling in wetlands.
- Water lilies facilitate the transport of methane from sediment to atmosphere throughout the growing season.
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