Regime difference between macrophyte and Cyanophyta dominance regulate microbial carbon sequestration mode in lake
Hezhong Yuan1, Tong Guan1, Enfeng Liu2
1Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control and Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China.
Water Research
|September 29, 2024
Summary
Macrophyte-dominated lakes enhance carbon sequestration more effectively than Cyanophyta-dominated ones. This difference is driven by microbial community structure and nutrient levels influencing carbon fixation in lake sediments.
Area of Science:
- Environmental Science
- Microbiology
- Biogeochemistry
Background:
- Lake ecosystems exhibit distinct regimes based on nutrient load, influencing predominant biotypes.
- Understanding carbon sequestration in lacustrine sediments under varying nutrient conditions is crucial for climate regulation.
Purpose of the Study:
- To investigate the impact of different lake regimes (macrophyte vs. Cyanophyta dominated) on carbon sequestration processes.
- To clarify the role of microbial communities and functional genes in carbon fixation within lacustrine sediments.
Main Methods:
- Analysis of dissolved organic matter (DOM) using fluorescence measurements.
- High-throughput sequencing of functional genes (cbbL, cbbM) involved in carbon fixation.
- Comparison of microbial diversity and community structure between macrophyte and Cyanophyta-dominated regimes.
Main Results:
- Humic-like DOM dominated in Cyanophyta-rich waters, while fulvic-acid-like DOM prevailed in macrophyte-rich waters.
- Microbial assimilation significantly influenced carbon fixation in both lake regimes.
- Macrophyte-dominated regimes exhibited higher bacterial diversity and species richness related to carbon fixation.
Conclusions:
- Lake regime shifts, driven by nutrient loads, alter microbial community structure and impact carbon sequestration stability.
- Both predominant and rare bacterial taxa play roles in regulating carbon sequestration in response to nutrient levels.
- Macrophyte-dominated lake ecosystems show greater potential for carbon sequestration, contributing to atmospheric carbon reduction.
Related Concept Videos
00:46Bioremediation
18.2K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
18.2K
01:06Primary Production
23.6K
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
23.6K