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Does within-biome drought sensitivity reflect patterns across biomes?

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Climate change intensifies droughts. This study reveals that even within a single biome, ecosystems with lower mean annual precipitation (MAP) show greater drought sensitivity, impacting primary production.

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Area of Science:

  • Ecology
  • Climate Change Science
  • Remote Sensing

Background:

  • Ecosystem sensitivity to drought is crucial amid increasing climate change impacts.
  • Aboveground net primary production (ANPP) reductions quantify drought sensitivity.
  • Mean annual precipitation (MAP) is a known factor influencing drought sensitivity across biomes.

Purpose of the Study:

  • To investigate drought sensitivity patterns within a single biome (shortgrass steppe) to disentangle abiotic and biotic factors.
  • To assess the relationship between MAP and drought sensitivity in a more homogenous ecosystem.
  • To understand if MAP influences drought sensitivity within a biome, not just across biomes.

Main Methods:

  • Utilized 23 years of satellite-derived ANPP proxies (NDVI and EVI).
  • Employed gridded precipitation data for the western U.S. shortgrass steppe.
  • Analyzed relationships between drought sensitivity and MAP across 157,929 pixels (1 km² resolution).

Main Results:

  • Confirmed a negative relationship between MAP and drought sensitivity within the shortgrass steppe.
  • The observed relationship was weaker compared to multi-biome studies.
  • Found that MAP plays a role in drought sensitivity differences even within a single biome.

Conclusions:

  • Long-term precipitation history (MAP) influences ecosystem drought sensitivity within a biome.
  • While vegetation differences contribute, MAP is an important factor in drought response.
  • Findings suggest MAP is a key determinant of ecosystem resilience to drought.