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The 'island effect' in terrestrial global change experiments: a problem with no solution?

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Global environmental changes impact plant transpiration and productivity. A bias, termed the "island effect," arises in experiments due to ambient humidity influencing treated vegetation plots, complicating results.

Keywords:
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Area of Science:

  • Ecology
  • Environmental Science
  • Plant Physiology

Background:

  • Global environmental changes (rising CO2, warming, altered precipitation) affect ecosystem energy balance and plant transpiration.
  • Changes in plant transpiration alter surrounding air humidity, creating a feedback loop impacting productivity.
  • Field experiments on global change effects are often limited to small, isolated vegetation plots.

Purpose of the Study:

  • To discuss the implications of the 'island effect' in global change experiments.
  • To highlight how ambient humidity in experimental plots can bias results.
  • To propose methods for addressing this bias in ecological research.

Main Methods:

  • Discussion of implications in various global change experiments.
  • Suggestion of complementary approaches using modeling and observational studies.
  • Analysis of feedback mechanisms in vegetation responses.

Main Results:

  • Experimental assessments of global change effects may systematically lack modifications from humidity feedback mechanisms.
  • This lack of modification introduces a bias of unknown magnitude in transpiration-dependent measurements.
  • The 'island effect' is a pervasive issue in small-plot global change experiments.

Conclusions:

  • There is no straightforward solution to the 'island effect' in field experiments.
  • Modeling approaches are essential for estimating the impact of humidity feedbacks on vegetation responses.
  • Increased awareness of the 'island effect' can improve the interpretation of global change research.