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Elevation alters ecosystem properties across temperate treelines globally.

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Temperature declines with elevation, impacting plant nutrients and soil. These changes at the treeline ecotone suggest future warming could disrupt montane ecosystem functions globally.

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Area of Science:

  • Ecology
  • Biogeochemistry
  • Climate Science

Background:

  • Temperature is a key factor influencing biodiversity and ecosystem boundaries.
  • Elevational gradients (thermoclines) are crucial for understanding ecological responses to climate change.
  • The transition from forest to alpine tundra at treelines presents a unique ecological boundary.

Purpose of the Study:

  • To investigate global consistency in above- and belowground ecosystem responses to elevational temperature changes.
  • To disentangle direct and indirect effects of temperature on plant communities and soil properties.
  • To evaluate replicate treeline ecotones across seven temperate regions worldwide.

Main Methods:

  • Assessed tree leaf nutrient concentrations along elevational gradients.
  • Quantified ground-layer plant nitrogen and phosphorus stoichiometry.
  • Analyzed soil organic matter content, carbon-to-nitrogen ratios, and microbial properties.

Main Results:

  • Declining temperatures with increasing elevation did not alter tree leaf nutrients.
  • Ground-layer plant nitrogen decreased with elevation, leading to nitrogen-phosphorus ratio convergence.
  • Elevation-driven nutrient changes correlated with altered soil organic matter and microbial properties.

Conclusions:

  • Temperature directly influences ground-layer plant stoichiometry and indirectly affects soil properties at treelines.
  • Future climate warming may disrupt montane ecosystem functions, especially if plant communities reorganize faster than treelines advance.