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Updated: Jul 1, 2025

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
Published on: March 12, 2013
Large herbivore grazing accelerates litter decomposition in terrestrial ecosystems
Ao Jiang1, Tserang Donko Mipam2, Luhuai Jing1
1Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station, Key Laboratory for Bio-resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610064, China.
Large herbivore grazing significantly accelerates plant litter decomposition and carbon release globally. Moderate grazing enhances this effect, while heavy grazing can inhibit it, highlighting the importance of grazing intensity.
Area of Science:
- Ecology
- Biogeochemistry
- Environmental Science
Background:
- Plant litter decomposition is vital for global carbon and nutrient cycling.
- The impact of large herbivore grazing on this process and its underlying mechanisms require further investigation.
Purpose of the Study:
- To determine how litter decomposition and nutrient cycling respond to varying grazing intensities.
- To elucidate the mechanisms driving these responses.
Main Methods:
- Analysis of 1203 paired observations and 381 independent experiments.
- Assessment of grazing intensity, livestock type, climate, decomposition duration, litter quality, and soil properties.
Main Results:
- Grazing increased litter decomposition rate by 14.08% and carbon release by 5.03%, notably in grasslands and croplands.
- Moderate grazing enhanced the home-field advantage, whereas heavy grazing inhibited it.
- The effect of grazing was more pronounced for high-quality litter and varied with grazing intensity and duration.
Conclusions:
- Large herbivore grazing globally accelerates litter decomposition.
- Grazing intensity is a critical factor influencing litter decomposition rates and should be incorporated into ecosystem models.
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