Evidence, causes, and consequences of declining nitrogen availability in terrestrial ecosystems.

Academic Article

Abstract

  • The productivity of ecosystems and their capacity to support life depends on access to reactive nitrogen (N). Over the past century, humans have more than doubled the global supply of reactive N through industrial and agricultural activities. However, long-term records demonstrate that N availability is declining in many regions of the world. Reactive N inputs are not evenly distributed, and global changes-including elevated atmospheric carbon dioxide (CO2) levels and rising temperatures-are affecting ecosystem N supply relative to demand. Declining N availability is constraining primary productivity, contributing to lower leaf N concentrations, and reducing the quality of herbivore diets in many ecosystems. We outline the current state of knowledge about declining N availability and propose actions aimed at characterizing and responding to this emerging challenge.
  • Authors

  • Mason, Rachel E
  • Craine, Joseph M
  • Lany, Nina K
  • Jonard, Mathieu
  • Ollinger, Scott
  • Groffman, Peter M
  • Fulweiler, Robinson W
  • Angerer, Jay
  • Read, Quentin D
  • Reich, Peter B
  • Templer, Pamela H
  • Elmore, Andrew J
  • Status

    Publication Date

  • April 15, 2022
  • Published In

    Keywords

  • Animals
  • Carbon Dioxide
  • Ecosystem
  • Herbivory
  • Humans
  • Nitrogen
  • Nitrogen Cycle
  • Plant Leaves
  • Soil
  • Digital Object Identifier (doi)

    Pubmed Id

  • 35420945
  • Start Page

  • eabh3767
  • Volume

  • 376
  • Issue

  • 6590