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Elevated CO2 influences nutrient availability in young beech-spruce communities on two soil types.

Frank Hagedorn1, Werner Landolt2, David Tarjan2

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Area of Science:

  • Forestry and soil science
  • Plant physiology
  • Environmental science

Background:

  • Forest ecosystems face increasing atmospheric carbon dioxide (CO2) levels.
  • Nutrient cycling in forests is crucial for ecosystem health and carbon sequestration.
  • Understanding plant and soil responses to elevated CO2 is vital for predicting future forest dynamics.

Purpose of the Study:

  • To investigate the influence of soil type and nitrogen (N) deposition on elevated CO2 effects on nutrient accumulation in spruce and beech.
  • To determine how elevated CO2 affects soil nutrients and the net accumulation of essential elements (N, P, K, S, Ca, Mg, Fe, Mn, Zn).
  • To compare the responses of Picea abies (spruce) and Fagus sylvatica (beech) to these environmental changes.

Main Methods:

  • Establishment of model ecosystems in open-top chambers on two distinct forest soils: acidic loam and calcareous sand.
  • Application of elevated N deposition (0.7 vs 7 g N m-2 a-1) and elevated CO2 concentrations (370 vs 570 µmol CO2 mol-1).
  • Measurement of net nutrient accumulation in tree biomass and analysis of soil and soil solution nutrient concentrations.

Main Results:

  • The effect of elevated CO2 on nutrient accumulation was significantly dependent on soil type and varied between spruce and beech.
  • On acidic loam, CO2 suppressed nutrient accumulation in beech but stimulated it in spruce.
  • On calcareous sand, elevated CO2 enhanced nutrient accumulation in both species; N deposition did not alter CO2 effects.

Conclusions:

  • Soil type is a critical factor mediating forest responses to elevated CO2, influencing nutrient dynamics and species-specific accumulation.
  • Elevated CO2 alters nutrient ratios in tree biomass, with a relative decline in nitrogen accumulation.
  • Forest management and conservation strategies must consider soil properties and species composition to predict and mitigate impacts of climate change.