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Soil nitrogen availability drives the response of soil microbial biomass to warming. | LitMetric

Soil nitrogen availability drives the response of soil microbial biomass to warming.

Sci Total Environ

Key Laboratory for Model Innovation in Forage Production Efficiency, Ministry of Agriculture and Rural Affuirs, Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot 010010, China. Electronic address:

Published: March 2024

AI Article Synopsis

  • A global meta-analysis was conducted to understand how elevated temperatures affect soil microbial biomass, revealing that the response to warming is complex and varies under different conditions.
  • Results indicate that significant increases in microbial biomass occur primarily when temperatures rise by at least 2°C, especially in environments with high precipitation, short treatment durations, and agricultural settings.
  • The study highlights that changes in soil nitrogen availability play a crucial role in mediating how soil microbial biomass responds to warming, while multiple factors such as temperature, duration, and precipitation interact to shape these effects.

Article Abstract

Although soil microbial biomass responses to experimental warming have been extensively studied, the mechanisms through which elevated temperatures influence soil microbial biomass remain unclear. In this study, we performed a global meta-analysis to quantify the global pattern of soil microbial biomass in response to warming. Our findings suggest that global warming effect is not apparent when all the data are pooled together, while warming does increase microbial biomass under specific conditions (Δ°C ≥ 2 °C). This constructive influence is particularly accentuated under certain circumstances, including high precipitation levels (>800 mm), short treatment durations (<1 year), and within agricultural ecosystems. More importantly, our findings suggest that the impact of global warming on soil microbial biomass is largely mediated by changes in soil nitrogen availability. These findings underscore the pivotal role of nitrogen availability in modulating the response of soil microbial biomass to warming, while also emphasizing the intricate influence between multiple factors such as temperature, duration, and precipitation in shaping the patterns of warming effects.

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Source
http://dx.doi.org/10.1016/j.scitotenv.2024.170505DOI Listing

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