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Net ecosystem productivity (NEP), a measure of carbon uptake, decreases with elevation in China. High-elevation ecosystems show greater sensitivity to temperature and faster NEP changes.

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Area of Science:

  • Ecology
  • Environmental Science
  • Climate Change Research

Background:

  • Elevation gradients significantly influence terrestrial ecosystem structure and function.
  • Understanding elevation-dependent patterns of carbon uptake, specifically net ecosystem productivity (NEP), is crucial but underexplored.

Purpose of the Study:

  • To investigate the elevation-dependent patterns of net ecosystem productivity (NEP) across China.
  • To analyze the factors shaping NEP along elevation gradients.
  • To assess the temperature sensitivity and temporal changes of NEP in different elevation zones.

Main Methods:

  • Analysis of data from 203 eddy covariance sites across China.
  • Statistical analysis of elevation-dependent patterns of NEP.
  • Assessment of temperature sensitivity using observed data.
  • Utilizing model ensemble and satellite observations for temporal trend analysis.
  • Application of machine learning for future NEP change predictions.

Main Results:

  • A negative linear elevation-dependent pattern of NEP was identified across China.
  • Hydrothermal factors, nutrient supply, and ecosystem types collectively shape this pattern.
  • Net ecosystem productivity (NEP) exhibits higher temperature sensitivity in high-elevation environments (3000-5000 m) compared to lower elevations (<3000 m).
  • High-elevation environments show more rapid relative changes in NEP over the past four decades.
  • Machine learning predicts a stronger relative increase in NEP in high-elevation areas.

Conclusions:

  • Terrestrial ecosystems in China exhibit a varying elevation-dependent pattern of net ecosystem productivity (NEP).
  • High-elevation ecosystems are more sensitive to temperature and undergoing faster changes in carbon uptake.
  • Future climate change may lead to disproportionately larger shifts in NEP in high-elevation regions.