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Abstract <p>In situ manipulation experiments are among the most informative methods to study the effects of climate change on the productivity of terrestrial ecosystems. Monitoring of the test plots situated near gas flares is an alternative to expensive and laborious manipulation experiments involving soil warming and drying. The aim of the study is to determine the effect of long-term warming and drying on the kinetics of soil organic matter (SOM) decomposition, microbial biomass carbon content, and the structure of soil microbial community on the monitoring test plots near gas flares in the Khanty-Mansi Autonomous Okrug (Yugra). In addition, we compared the earlier observed response of microbial activity characteristics to warming and drying with the data measured five years later. The sustainable trend of a decrease in the microbial biomass carbon content, dissolved nutrients, and basal respiration activity with the distance from gas flare was revealed. However, the earlier detected trend of an increase in the kinetic rate constant of SOM decomposition (<i>k</i><sub>1</sub>) and a decrease in the relative size of labile SOM pool (<i>A</i><sub>1</sub>) with an increase in stress have reversed in five years. The changes in the <i>k</i><sub>1</sub> and <i>A</i><sub>1</sub> responses are most likely related to the accumulation of stable SOM pools in soil and the leveling young pine trees in productivity and rhizodeposition activity, suggesting an aging of the ecosystem. The shifts in the soil prokaryotic community structure when approaching the flare appear as an increase in the relative abundance of the drought-tolerant class Ktedonobacteria (phylum Chloroflexi) and a decrease in the relative abundance of the phyla Acidobacteria<i>,</i> Verrucomicrobia, and archaea Thaumarchaeota. As for the soil fungal community, the relative abundance of the class Leotiomycetes (phylum Ascomycota) increases with the warming and drying stress intensity, and the abundance of Agaricomycetes (phylum Basidiomycota) decreases. Thus, a long-term soil warming and drying stress changes the composition of soil microbiome and considerably decreases microbial biomass, labile SOM, and its decomposition rate in the soils of forest ecosystems.</p>

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Impact of Soil Warming and Drying on the Decomposition and Accumulation of Organic Matter and Soil Microbiome

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • I. V. Yevdokimov,
  • M. V. Semenov,
  • S. S. Bykhovets,
  • D. M. Dudareva,
  • A. K. Kvitkina,
  • G. S. Krasnov,
  • I. A. Yusupov

摘要

Abstract

In situ manipulation experiments are among the most informative methods to study the effects of climate change on the productivity of terrestrial ecosystems. Monitoring of the test plots situated near gas flares is an alternative to expensive and laborious manipulation experiments involving soil warming and drying. The aim of the study is to determine the effect of long-term warming and drying on the kinetics of soil organic matter (SOM) decomposition, microbial biomass carbon content, and the structure of soil microbial community on the monitoring test plots near gas flares in the Khanty-Mansi Autonomous Okrug (Yugra). In addition, we compared the earlier observed response of microbial activity characteristics to warming and drying with the data measured five years later. The sustainable trend of a decrease in the microbial biomass carbon content, dissolved nutrients, and basal respiration activity with the distance from gas flare was revealed. However, the earlier detected trend of an increase in the kinetic rate constant of SOM decomposition (k1) and a decrease in the relative size of labile SOM pool (A1) with an increase in stress have reversed in five years. The changes in the k1 and A1 responses are most likely related to the accumulation of stable SOM pools in soil and the leveling young pine trees in productivity and rhizodeposition activity, suggesting an aging of the ecosystem. The shifts in the soil prokaryotic community structure when approaching the flare appear as an increase in the relative abundance of the drought-tolerant class Ktedonobacteria (phylum Chloroflexi) and a decrease in the relative abundance of the phyla Acidobacteria, Verrucomicrobia, and archaea Thaumarchaeota. As for the soil fungal community, the relative abundance of the class Leotiomycetes (phylum Ascomycota) increases with the warming and drying stress intensity, and the abundance of Agaricomycetes (phylum Basidiomycota) decreases. Thus, a long-term soil warming and drying stress changes the composition of soil microbiome and considerably decreases microbial biomass, labile SOM, and its decomposition rate in the soils of forest ecosystems.