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Updated: Jul 11, 2025

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Aridity creates global thresholds in soil nitrogen retention and availability.

Ahmed S Elrys1,2,3, Mohamed F Abo El-Maati4, Xiaoqian Dan1

  • 1College of Tropical Crops, Hainan University, Haikou, China.

Global Change Biology
|November 9, 2023
PubMed
Summary
This summary is machine-generated.

Climate change-driven aridity shifts terrestrial ecosystems. Increasing aridity alters nitrogen cycling rates, impacting plant nitrogen availability globally by affecting soil microbial biomass carbon and nitrogen.

Keywords:
15N isotope dilutionclimate changedroughtdrylandsnitrification capacitynitrogen retention

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Area of Science:

  • Ecology
  • Biogeochemistry
  • Environmental Science

Background:

  • Terrestrial ecosystems face critical vulnerabilities due to climate change, particularly shifts in aridity.
  • Understanding the global response of nitrogen (N) cycling to aridity is crucial for predicting ecosystem health.

Purpose of the Study:

  • To identify global threshold responses of soil gross N cycling rates to the aridity index (AI).
  • To investigate how aridity influences key soil process-related variables across diverse terrestrial ecosystems.

Main Methods:

  • Utilized a comprehensive dataset of 14,144 observations from 451 15N-labeled studies.
  • Applied segmented regression analysis to determine threshold responses of N cycling to AI.

Main Results:

  • Increasing aridity globally reduced nitrate consumption but enhanced nitrification, linked to decreased microbial biomass carbon (MBC) and N (MBN) and increased soil pH.
  • Identified distinct aridity thresholds for gross N production and retention in croplands, grasslands, and forests, with varying impacts on N availability.

Conclusions:

  • Projected increases in aridity due to climate change will likely decrease plant N availability in arid regions and increase it in humid regions.
  • These shifts in N cycling dynamics have significant implications for ecosystem services and functions, highlighting ecosystem vulnerabilities.