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Updated: Feb 25, 2026

Soil Lysimeter Excavation for Coupled Hydrological, Geochemical, and Microbiological Investigations

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Published on: September 11, 2016

Fertilization and Aridity Legacies Determine Soil Microbial Necromass Persistence Across Climates.

Li-Xin Xu¹, Guang-Hui Yu¹, Cong-Qiang Liu¹

¹Institute of Surface-Earth System Science, School of Earth System Science, Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, Tianjin, China.

Global Change Biology

|February 24, 2026

Summary

Soil moisture and fertilization legacies interact to control microbial necromass-mineral associations in croplands. Aridity weakens these bonds, but long-term fertilization can enhance carbon accrual, impacting soil carbon persistence.

Keywords:

amino sugars humification index legacy effects long‐term fertilization necromass‐mineral interactions reactive minerals μ‐FTIR

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Area of Science:

Soil Science
Ecology
Biogeochemistry

Background:

Microbial necromass-mineral interactions are key to soil organic carbon (C) persistence.
The influence of climate and fertilization legacies on these interactions in croplands is not well understood.

Purpose of the Study:

To investigate how aridity and long-term fertilization affect microbial necromass stabilization with minerals.
To determine the role of soil moisture in mediating these interactions and their impact on soil C resilience.

Main Methods:

Utilized six long-term field sites across an aridity gradient (27-38 years).
Employed in situ μ-FTIR spectroscopy to map organic C transformation and necromass-mineral associations.
Analyzed data considering aridity index (AI) and fertilization history.

Main Results:

Necromass stabilization with short-range ordered (SRO) minerals was strong in humid zones (AI < 1.3) but weakened significantly in arid zones (AI > 1.3).
Long-term fertilization effects on necromass C accrual can override aridity-driven constraints.
Reduced organic C transformation and weakened necromass-SRO associations were observed in outer aggregate rims under arid conditions.

Conclusions:

Soil moisture is a critical factor regulating fertilization-induced ecological memory in mineral-necromass interactions.
Findings challenge the universal application of SRO-associated C paradigms across different moisture regimes.
Climate-tailored management practices are essential for maintaining soil C resilience in water-limited ecosystems facing aridification.