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Updated: Apr 25, 2026

Temperature Response of Soil Organic Matter Decomposition Rates: Construction and Applications of a Temperature Gradient Block
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Temperature Response of Soil Organic Matter Decomposition Rates: Construction and Applications of a Temperature Gradient Block

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Microbial Responses to Warming Reduce Deep Blue Carbon Storage.

Leilei Xiao1,2, Jian Liu3, Genevieve L Noyce4

  • 1CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China.

Global Change Biology
|April 24, 2026
PubMed
Summary
This summary is machine-generated.

Climate warming reduces microbial carbon fixation in deep coastal wetland soils. This impacts blue carbon storage, despite initial increases in plant productivity and respiration.

Keywords:
blue carbon storageclimate warmingmicrobial carbon fixationmicrobial respirationplant‐derived carbon inputssoil stratification

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Area of Science:

  • Environmental Science
  • Soil Science
  • Climate Change Research

Background:

  • Coastal wetlands are vital blue carbon sinks.
  • Understanding warming's impact on belowground carbon is crucial.
  • Deep soil carbon dynamics under warming are poorly understood.

Purpose of the Study:

  • Investigate depth-resolved effects of warming on coastal wetland carbon cycling.
  • Quantify changes in carbon inputs, respiration, and microbial fixation over 8 years.
  • Assess the impact of a 2°C warming scenario on soil carbon dynamics.

Main Methods:

  • Conducted an 8-year in situ warming experiment in coastal wetlands.
  • Monitored plant carbon fixation (net primary productivity) and soil respiration.
  • Analyzed microbial carbon fixation using phospholipid fatty acids, amino sugars, and metagenomics across a 60cm soil profile.

Main Results:

  • Plant carbon fixation and soil respiration showed initial increases followed by declines, stabilizing later.
  • Soil and microbial respiration became substrate-limited with prolonged warming.
  • Microbial carbon fixation in deep soils (40-60cm) decreased by over one-third.

Conclusions:

  • Deep soil microbial carbon retention is vulnerable to long-term climate warming.
  • Warming impacts deep soil carbon independently of plant inputs or respiration.
  • Highlights overlooked mechanisms affecting blue carbon storage in changing environments.