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Area of Science:

  • Urban ecology
  • Soil microbiology
  • Environmental science

Background:

  • Soil microbial communities are crucial for urban ecosystem services but remain understudied.
  • Engineered green infrastructure (GI) like green roofs and bioswales are increasingly common in cities.
  • Understanding microbial community assembly in these novel urban habitats is vital.

Purpose of the Study:

  • To compare microbial communities in engineered GI (green roofs, bioswales) versus non-engineered soils (parks, tree pits) in NYC.
  • To determine if habitat specifications drive distinct microbial composition and function.
  • To link observed patterns to community assembly processes.

Main Methods:

  • Investigated bacterial and fungal communities in four urban soil types: green roofs, bioswales, park lawns, and tree pits.
  • Analyzed microbial community composition and trait-associated diversity.
  • Assessed functional potential related to nitrogen cycling, biodegradation, and decomposition.

Main Results:

  • Green roofs and bioswales exhibited distinct microbial communities compared to park and tree pit soils.
  • Microbial differences were habitat-driven, not correlated with geographic distance.
  • Bioswales and green roofs showed enhanced functional potential, particularly for nitrogen cycling and plant growth traits.

Conclusions:

  • Engineered urban soils are shaped by environmental filtering, leading to distinct microbial communities.
  • Non-engineered urban soils appear more influenced by stochastic processes.
  • Habitat design significantly impacts soil microbial diversity and function in urban ecosystems.