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Simulating Temperature in a Soil Incubation Experiment
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Published on: October 28, 2022

Warming and drought reduce temperature sensitivity of nitrogen transformations.

Dolaporn S Novem Auyeung1, Vidya Suseela, Jeffrey S Dukes

  • 1Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, USA. novema@gmail.com

Global Change Biology
|March 19, 2013
PubMed
Summary

Global change factors like warming and altered precipitation rarely affected nitrogen cycling rates in this old-field study. These findings suggest ecosystem models may overestimate terrestrial productivity feedback to climate change.

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Area of Science:

  • Ecology
  • Biogeochemistry
  • Global Change Biology

Background:

  • Nitrogen (N) cycling is crucial for terrestrial productivity and climate feedbacks.
  • Previous studies often examined single global change factors, lacking multifactorial and seasonal insights into N mineralization and nitrification.

Purpose of the Study:

  • To investigate the combined effects of warming and altered precipitation on N cycling rates and temperature sensitivity.
  • To assess seasonal variations in these responses within an old-field ecosystem.

Main Methods:

  • Experimental manipulation of warming (up to 4 °C) and precipitation (drought, ambient, wet).
  • Measurement of net N mineralization, net nitrification, potential nitrification, and C mineralization to N mineralization ratios.
  • Analysis of temperature sensitivity (Q10) of N cycling processes.

Main Results:

  • Warming and altered precipitation had minimal impact on N cycling rates and showed no seasonal patterns.
  • Warming and drought significantly decreased the temperature sensitivity (apparent Q10) of N mineralization and nitrification.
  • The ratio of C to N mineralization was influenced by the interaction of warming and precipitation treatments.

Conclusions:

  • Warming may not consistently accelerate N cycling in all ecosystems, contrary to common assumptions.
  • Ecosystem models predicting increased terrestrial productivity and climate feedbacks due to warming may overestimate these effects.
  • The interactive effects of multiple global change drivers are critical for understanding N cycling dynamics.