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Updated: Jun 27, 2026

Microplot Design and Plant and Soil Sample Preparation for 15Nitrogen Analysis
08:44

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Published on: May 10, 2020

Root Exudates Shape Soil Organic Carbon Stabilization by Controlling Microbial Necromass Formation Under Long-Term

Zheng Jiang1,2,3, Cong Wang1,2,3, Huifeng Sun1,2,3

  • 1Eco-Environmental Protection Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China.

Microorganisms
|June 26, 2026
PubMed
Summary

Long-term nitrogen fertilization boosts soil organic carbon (SOC) by increasing root exudates and microbial necromass. This highlights the crucial role of plant-soil interactions in stabilizing carbon in rice fields.

Keywords:
microbial necromassnitrogen fertilizationroot exudatessoil organic carbon

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Last Updated: Jun 27, 2026

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08:44

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Design and Operation of a Continuous 13C and 15N Labeling Chamber for Uniform or Differential, Metabolic and Structural, Plant Isotope Labeling
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Assessment of Labile Organic Carbon in Soil Using Sequential Fumigation Incubation Procedures
09:04

Assessment of Labile Organic Carbon in Soil Using Sequential Fumigation Incubation Procedures

Published on: October 29, 2016

Area of Science:

  • Agricultural Science
  • Soil Science
  • Ecology

Background:

  • Soil organic carbon (SOC) stabilization is vital for soil health and climate regulation.
  • Microbial necromass is a key component of stable SOC, but the influence of root exudates under nitrogen (N) fertilization is unclear.

Purpose of the Study:

  • To investigate the impact of long-term N fertilization on SOC dynamics in paddy soil.
  • To identify the primary drivers of SOC accumulation, focusing on root exudates and microbial necromass.

Main Methods:

  • Studied paddy soil under 12 years of urea fertilization at varying rates (0-300 kg N ha⁻¹).
  • Quantified root exudate inputs, microbial community structure, microbial necromass, and soil properties.
  • Employed structural equation modeling to determine causal relationships.

Main Results:

  • SOC content increased with N application rates.
  • N fertilization led to higher root exudate inputs and altered microbial communities.
  • Enhanced microbial necromass accumulation was observed with increasing N rates.

Conclusions:

  • Long-term N fertilization promotes SOC accumulation by stimulating root exudate-driven microbial necromass.
  • Root exudates act as a critical link between N fertilization, microbial necromass, and SOC stabilization.
  • Plant-soil interactions are pivotal in regulating carbon dynamics in rice agroecosystems.