Ammonium and nitrate as nitrogen sources in two Eriophorum species

George W Koch, Arnold J. Bloom, F. Stuart Chapin

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We compared ammonium and nitrate nutrition in Eriophorum scheuchzeri and E. vaginatum, two Alaskan sedges that are native to high- and low-fertility sites, respectively. When grown in solution culture, the two species were similar in their kinetics of NHinf4sup+NOinf3sup-absorption: at nitrogen concentrations below 50 μM, net NHinf4sup+and NOinf3sup-were absorbed at similar rates, but at higher concentrations, net uptake of NOinf3sup-was significantly faster than that of NHinf4sup+. The two species also showed similar abilities to assimilate NOinf3sup-. Growth of E. vaginatum under NOinf3sup-nutrition was only slightly less than that under NHinf4sup+. The observed similarities between these species from contrasting edaphic habitats indicate that factors other than tissue-specific rates of nitrogen acquisition and assimilation may underlie local adaptation to soil N fertility. Moreover, the capacity of these species to exploit NOinf3sup-as a N source supports the view that NOinf3sup-availability may be significant even in wet, acidic, arctic soils.

Original languageEnglish (US)
Pages (from-to)570-573
Number of pages4
JournalOecologia
Volume88
Issue number4
DOIs
StatePublished - Dec 1991
Externally publishedYes

Fingerprint

Eriophorum
soil fertility
ammonium
nitrates
nitrate
fertility
nitrogen
Eriophorum vaginatum
nutrition
Cyperaceae
malnutrition
Arctic region
local adaptation
assimilation (physiology)
soil
uptake mechanisms
kinetics
habitats
habitat

Keywords

  • Absorption
  • Ammonium
  • Eriophorum scheuchzeri
  • Eriophorum vaginatum
  • Nitrate

ASJC Scopus subject areas

  • Ecology

Cite this

Ammonium and nitrate as nitrogen sources in two Eriophorum species. / Koch, George W; Bloom, Arnold J.; Chapin, F. Stuart.

In: Oecologia, Vol. 88, No. 4, 12.1991, p. 570-573.

Research output: Contribution to journalArticle

Koch, George W ; Bloom, Arnold J. ; Chapin, F. Stuart. / Ammonium and nitrate as nitrogen sources in two Eriophorum species. In: Oecologia. 1991 ; Vol. 88, No. 4. pp. 570-573.
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