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Related Concept Videos

Adaptations that Reduce Water Loss01:57

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Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
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Related Experiment Video

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A Method for Quantifying Foliage-Dwelling Arthropods
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Comparative Foliar Atmospheric Mercury Accumulation across Functional Types in Temperate Trees.

Xinyu Zhang1, Huhu Kang2, Xiaohong Liu1

  • 1School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China.

Environmental Science & Technology
|January 23, 2025
PubMed
Summary
This summary is machine-generated.

Deciduous trees accumulate more mercury (Hg) than evergreens due to distinct ecophysiological strategies. Understanding these differences is key for refining mercury deposition models.

Keywords:
atmospheric GEMatmospheric pollutantsfoliar Hg accumulationmeteorological conditiontemperate foreststree functional types

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Area of Science:

  • Environmental Chemistry
  • Plant Ecology
  • Atmospheric Science

Background:

  • Vegetation's uptake of gaseous elemental mercury (GEM) is a major pathway for mercury deposition in terrestrial ecosystems.
  • Understanding how different plant types accumulate mercury is crucial for ecological and environmental health assessments.

Purpose of the Study:

  • To investigate mercury (Hg) accumulation mechanisms in deciduous broadleaves versus evergreen needles.
  • To determine how ecophysiological strategies influence Hg accumulation in different tree functional types.
  • To develop an empirical model for foliar Hg accumulation.

Main Methods:

  • Comparison of total Hg (THg) concentrations and accumulation rates (THgrate) between deciduous and evergreen species.
  • Analysis of ecophysiological indicators: δ13C, δ18O, leaf mass per area, and leaf dry matter content.
  • Statistical analysis of meteorological factors, air pollutants (PM2.5, NO2), and their correlation with THgrate.

Main Results:

  • Deciduous leaves showed significantly higher THg concentrations and THgrate compared to evergreen needles.
  • Distinct ecophysiological strategies were observed: deciduous trees exhibit dynamic stomatal control, while evergreens show stable control, influencing Hg uptake.
  • Precipitation and wind speed negatively affected foliar THgrate, while PM2.5 and NO2 showed synergistic effects with Hg accumulation in evergreens.

Conclusions:

  • Tree functional type and species-specific ecophysiological strategies significantly mediate GEM accumulation.
  • Deciduous trees play a key role in controlling THgrate through rapid stomatal adjustment.
  • The developed empirical model enhances the understanding and prediction of foliar Hg accumulation in diverse ecosystems.