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Related Concept Videos

Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme nitrate reductase...
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Related Experiment Video

Updated: Jul 16, 2026

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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Published on: January 16, 2014

Nitrogen Availability Modulates Root-Mediated Soil Organic Carbon Formation.

Xiaodong Wang1, Lei Wang1, Yarui Xin1

  • 1School of Resources and Environment, Northeast Agricultural University, Harbin 150030, China.

Environmental Science & Technology
|July 15, 2026
PubMed
Summary

Living roots help stabilize soil organic carbon (SOC) from straw by directing it into protected soil pools. This process differs between low and high nitrogen soils, driven by microbial nutrient needs.

Keywords:
isotopic labelingmicrobial metabolic strategiessoil organic carbon poolsstraw carbon fatestraw incorporation

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Last Updated: Jul 16, 2026

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10:16

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

Published on: October 29, 2016

Area of Science:

  • Soil Science
  • Biogeochemistry
  • Agronomy

Background:

  • Living roots play a role in soil organic carbon (SOC) formation during straw incorporation.
  • The precise mechanisms by which roots influence SOC accumulation and stabilization remain largely unknown.

Purpose of the Study:

  • To investigate the mechanisms by which living roots affect the formation and stabilization of soil organic carbon (SOC) derived from straw incorporation.
  • To understand how soil nitrogen availability influences root-mediated SOC dynamics.

Main Methods:

  • Utilized isotopically labeled maize straw to trace carbon flow into different SOC pools.
  • Incubated soil cores in a soybean field to simulate field conditions with active root systems.
  • Analyzed the allocation of straw-derived carbon into stable SOC fractions, including occluded particulate organic carbon (oPOC) and mineral-associated organic carbon (MAOC), under varying nitrogen conditions.

Main Results:

  • Root ingrowth did not significantly alter total SOC accumulation but enhanced the allocation of straw-derived carbon into stable SOC pools.
  • In low-nitrogen (LN) soils, root ingrowth increased stable SOC by facilitating carbon transfer into oPOC and MAOC.
  • In high-nitrogen (HN) soils, root ingrowth decreased the direct contribution of straw to stable SOC, but rhizodeposited carbon compensated by entering oPOC and MAOC.

Conclusions:

  • Root presence significantly influences the fate of straw-derived carbon, promoting its stabilization into protected soil pools.
  • Nitrogen availability critically modulates root-mediated SOC formation, with distinct mechanisms operating in LN versus HN soils.
  • Microbial carbon-to-nitrogen stoichiometry and resource availability are key drivers of the observed root-soil carbon interactions, offering mechanistic insights into SOC sequestration.