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Updated: Apr 6, 2026
10:20
Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
Published on: March 12, 2013
14.1K
Low-to-moderate nitrogen and phosphorus concentrations accelerate microbially driven litter breakdown rates
Summary
Nutrient enrichment, including nitrogen (N) and phosphorus (P), significantly accelerates the breakdown of leaf litter in streams. This microbially driven process increases aquatic ecosystem productivity and carbon loss, even at low nutrient levels.
Area of Science:
- Aquatic ecology
- Biogeochemistry
- Environmental science
Background:
- Particulate organic matter (POM) processing is vital for aquatic productivity and carbon cycling.
- Nutrient enrichment, particularly nitrogen (N) and phosphorus (P), influences POM processing.
- Previous studies often examined single nutrient effects, necessitating research on combined N and P impacts.
Purpose of the Study:
- To investigate the effects of low-to-moderate nitrogen and phosphorus enrichment on microbially driven leaf litter breakdown rates in experimental stream channels.
- To determine the interactive and additive effects of dual N and P enrichment on litter decomposition.
- To assess how nutrient addition alters litter stoichiometry and its relationship with breakdown rates.
Main Methods:
- Established 25 experimental combinations of dissolved inorganic N and soluble reactive P concentrations.
- Utilized maple and rhododendron leaf litter, excluding macroinvertebrates to focus on microbial decomposition.
- Measured litter breakdown rates (k) and related them to nutrient concentrations, litter stoichiometry, fungal biomass, and microbial respiration.
Main Results:
- Litter breakdown rates increased significantly (up to 6x for maple, 12x for rhododendron) along the N and P enrichment gradient.
- Both additive and interactive effects of N and P influenced breakdown rates, with N and P concentrations being key model components.
- Nutrient addition reduced litter C:N and C:P ratios, and breakdown rates correlated more strongly with nutrient concentrations than with fungal biomass or respiration.
Conclusions:
- Microbially driven litter processing rates increase substantially across low-to-moderate nutrient gradients common in human-modified landscapes.
- Dual N and P enrichment significantly enhances decomposition, impacting aquatic ecosystem productivity and carbon loss.
- Understanding these nutrient-driven changes is crucial for managing aquatic ecosystems.
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