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On the Three Major Recycling Pathways in Terrestrial Ecosystems
Juli G Pausas1, William J Bond2
1Centro de Investigaciones sobre Desertificación (CIDE-CSIC), Valencia, Spain.
Trends in Ecology & Evolution
|May 9, 2020
Summary
Nutrient cycling in ecosystems involves three key pathways: microbial decomposition, herbivory, and wildfires. Understanding these processes is crucial for ecosystem function and biodiversity regulation.
Area of Science:
- Ecology
- Biogeochemistry
- Ecosystem Science
Background:
- Plants form the largest biomass in terrestrial ecosystems.
- Litter decomposition is traditionally viewed as the primary nutrient return pathway.
Purpose of the Study:
- To identify and analyze the major pathways of plant biomass degradation and nutrient release in terrestrial ecosystems.
- To present a holistic view of ecosystem functioning by integrating microbial, vertebrate, and abiotic processes.
Main Methods:
- Conceptual synthesis of existing ecological knowledge.
- Comparative analysis of nutrient cycling mechanisms.
- Examination of spatial and temporal scales of degradation processes.
Main Results:
- Three dominant pathways for plant biomass degradation exist: microbial decomposition, vertebrate herbivory, and wildfires.
- These pathways operate at distinct spatial and temporal scales.
- Each pathway generates unique ecological and evolutionary feedbacks.
Conclusions:
- A comprehensive understanding of ecosystem regulation requires considering microbes, herbivores, and wildfires jointly.
- This integrated perspective enhances our knowledge of biosphere regulation mechanisms.
- Recognizing these diverse pathways is key to understanding ecosystem diversity.
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