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Temperature Response of Soil Organic Matter Decomposition Rates: Construction and Applications of a Temperature Gradient Block
Published on: January 30, 2026
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Warming Intensifies Nitrogen-Driven Destabilization of Alpine Soil-Dissolved Organic Matter.
Yi-Wen Cao1,2,3, Ning Zong4, Guodong Sun1,2,3
1State Key Laboratory of Soil Pollution Control and Safety, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China.
Environmental Science & Technology
|March 13, 2026
Summary
Warming and nitrogen enrichment in alpine grasslands increase soil carbon but do not interactively boost carbon accumulation. Warming amplifies nitrogen
Area of Science:
- Ecology
- Soil Science
- Climate Change Research
Background:
- Alpine grassland soils, particularly on the Qinghai-Tibet Plateau, hold significant carbon stocks crucial for global climate regulation.
- Dissolved organic matter (DOM) represents the most labile carbon pool, highly susceptible to environmental changes.
- The interactive effects of warming and nitrogen enrichment on soil DOM dynamics and microbial communities remain poorly understood.
Purpose of the Study:
- To investigate the interactive effects of warming and nitrogen enrichment on dissolved organic matter (DOM) quantity and quality in alpine grassland soils.
- To assess the impact of these global change drivers on soil microbial community structure and functional traits.
- To understand the implications for carbon turnover and climate feedbacks in these sensitive ecosystems.
Main Methods:
- A 12-year field experiment manipulating temperature (warming) and nitrogen availability (enrichment).
- Analysis of soil dissolved organic carbon (DOC) concentration and DOM quality indicators (aromaticity, biolability).
- Characterization of soil microbial community structure and functional traits.
Main Results:
- Nitrogen addition significantly increased soil DOC, while warming had a moderate effect; impacts were additive, not synergistic.
- Warming amplified nitrogen-induced shifts in DOM quality, decreasing aromaticity and increasing biolability.
- Changes in DOM were linked to shifts in microbial communities, favoring copiotrophic taxa and resource-acquisitive traits.
Conclusions:
- Warming intensifies nitrogen-driven acceleration of carbon turnover in alpine grasslands, despite additive effects on overall carbon accumulation.
- Climate-nutrient interactions critically influence soil carbon dynamics and microbial responses in these ecosystems.
- Understanding these interactions is vital for predicting future carbon-climate feedbacks from alpine regions.
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