Natural 15N abundance of plants and soil N in a temperate coniferous forest

Keisuke Koba, Muneto Hirobe, Lina Koyama, Ayato Kohzu, Naoko Tokuchi, Knute John Nadelhoffer, Eitaro Wada, Hiroshi Takeda

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

Measurement of nitrogen isotopic composition (δ15N) of plants and soil nitrogen might allow the characteristics of N transformation in an ecosystem to be detected. We tested the measurement of δ15N for its ability to provide a picture of N dynamics at the ecosystem level by doing a simple comparison of δ15N between soil N pools and plants, and by using an existing model. δ15N of plants and soil N was measured together with foliar nitrate reductase activity (NRA) and the foliar NO3 - pool at two sites with different nitrification rates in a temperature forest in Japan. δ15N of plants was similar to that of soil NO3 - in the high-nitrification site. Because of high foliar NRA and the large foliar NO 3 - pool at this site, we concluded that plant δ 15N indicated a great reliance of plants on soil NO3 - there. However, many δ15N of soil N overlapped each other at the other site, and δ15N could not provide definitive evidence of the N source. The existing model was verified by measured δ15N of soil inorganic N and it explained the variations of plant δ15N between the two sites in the context of relative importance of nitrification, but more information about isotopic fractionations during plant N uptake is required for quantitative discussions about the plant N source. The model applied here can provide a basis to compare δ15N signatures from different ecosystems and to understand N dynamics.

Original languageEnglish
Pages (from-to)457-469
Number of pages13
JournalEcosystems
Volume6
Issue number5
DOIs
Publication statusPublished - Aug 2003
Externally publishedYes

Fingerprint

coniferous forest
temperate forests
temperate forest
coniferous forests
Soils
Nitrification
soil
Ecosystems
Nitrate Reductase
nitrification
nitrate reductase
Nitrogen
ecosystems
ecosystem
isotope fractionation
nitrate
Fractionation
botanical composition
nitrogen
isotopic fractionation

Keywords

  • Foliar NO
  • Modeling
  • Nitrate reductase activity
  • Nitrogen availability
  • Nitrogen dynamics
  • Nitrogen isotope ratio

ASJC Scopus subject areas

  • Ecology

Cite this

Koba, K., Hirobe, M., Koyama, L., Kohzu, A., Tokuchi, N., Nadelhoffer, K. J., ... Takeda, H. (2003). Natural 15N abundance of plants and soil N in a temperate coniferous forest. Ecosystems, 6(5), 457-469. https://doi.org/10.1007/s10021-002-0132-6

Natural 15N abundance of plants and soil N in a temperate coniferous forest. / Koba, Keisuke; Hirobe, Muneto; Koyama, Lina; Kohzu, Ayato; Tokuchi, Naoko; Nadelhoffer, Knute John; Wada, Eitaro; Takeda, Hiroshi.

In: Ecosystems, Vol. 6, No. 5, 08.2003, p. 457-469.

Research output: Contribution to journalArticle

Koba, K, Hirobe, M, Koyama, L, Kohzu, A, Tokuchi, N, Nadelhoffer, KJ, Wada, E & Takeda, H 2003, 'Natural 15N abundance of plants and soil N in a temperate coniferous forest', Ecosystems, vol. 6, no. 5, pp. 457-469. https://doi.org/10.1007/s10021-002-0132-6
Koba, Keisuke ; Hirobe, Muneto ; Koyama, Lina ; Kohzu, Ayato ; Tokuchi, Naoko ; Nadelhoffer, Knute John ; Wada, Eitaro ; Takeda, Hiroshi. / Natural 15N abundance of plants and soil N in a temperate coniferous forest. In: Ecosystems. 2003 ; Vol. 6, No. 5. pp. 457-469.
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