Control of nitrogen loss from forested watersheds by soil carbon:Nitrogen ratio and tree species composition

Gary M. Lovett, Kathleen C. Weathers, Mary A. Arthur

Research output: Contribution to journalArticlepeer-review

249 Scopus citations

Abstract

Leaching losses of nitrate from forests can have potentially serious consequences for soils and receiving waters. In this study, based on extensive sampling of forested watersheds in the Catskill Mountains of New York State, we examine the relationships among stream chemistry, the properties of the forest floor, and the tree species composition of watersheds. We report the first evidence from North America that nitrate export from forested watersheds is strongly influenced by the carbon:nitrogen (C:N) ratio of the watershed soils. We also show that variation in soil C:N ratio is associated with variation in tree species composition. This implies that N retention and release in forested watersheds is regulated at least in part by tree species composition and that changes in species composition caused by introduced pests, climate change, or forest management could affect the capacity of a forest ecosystem to retain atmospherically deposited N.

Original languageEnglish
Pages (from-to)712-718
Number of pages7
JournalEcosystems
Volume5
Issue number7
DOIs
StatePublished - Nov 2002

Keywords

  • Acer saccharum
  • Carbon
  • Nitrate leaching
  • Nitrogen
  • Quercus rubra
  • Soils
  • Tree species
  • Watershed

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Environmental Chemistry
  • Ecology

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