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Continuous Abrupt Vegetation Shifts in the Global Terrestrial Ecosystem.

Maohong Wei1, Shengpeng Li2, Lin Zhu1

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Summary
This summary is machine-generated.

Ecosystems undergo continuous abrupt shifts (CAS), not just single ones. Different direction shifts (DDS) and same direction shifts (SDS) are driven by various climate factors, with hysteresis present in DDS.

Keywords:
climate changecontinuous abrupt shiftshysteresis effectslong time seriesvegetation recovery

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Area of Science:

  • Ecology
  • Climate Science
  • Environmental Science

Background:

  • Previous research focused on single abrupt ecosystem shifts.
  • Real-world ecosystems experience continuous abrupt shifts (CAS), including different direction shifts (DDS) and same direction shifts (SDS).
  • The patterns and drivers of these CAS are not well understood.

Purpose of the Study:

  • To investigate the patterns of DDS and SDS in vegetation dynamics.
  • To identify the key climate drivers influencing these shifts.
  • To examine hysteresis effects in relation to primary drivers.

Main Methods:

  • Analysis of two vegetation datasets to characterize DDS and SDS patterns.
  • Testing climate drivers: mean annual temperature (MAT), mean annual precipitation (MAP), soil temperature (ST), and soil water content (SW).
  • Examination of hysteresis effects using principal driver analysis.

Main Results:

  • DDS and SDS patterns exhibit significant regional variations across different climatic zones.
  • ST, SW, MAT, and MAP were identified as primary drivers for DDS.
  • MAT and MAP were found to be the main drivers for SDS.
  • Hysteresis effects were confirmed in relation to DDS.

Conclusions:

  • Continuous abrupt shifts (CAS) are widespread in ecosystems globally.
  • Climate change plays divergent roles in driving DDS and SDS.
  • Understanding these complex shifts is crucial for ecosystem management and climate change adaptation.