Diurnal and seasonal patterns of nitrogen fixation in an Alnus hirsuta plantation of Central Korea

Young Lee Yoon, Yo Whan Son

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We used an acetylene reduction assay to measure rates of nitrogen fixation on a 38-year-old Alnus hirsuta plantation in central Korea. The diurnal pattern of acetylene reduction changed significantly during May, August and October, typically varying by 3-fold throughout the course of the day. Maximum rates occurred at 3 p.m. in May and October, but at 6 p.m. in August. Increasing trends were evident during the early growing season, with sustained high rates from mid-May through late September; July had the highest rates, averaging 7.2 μmole g-1 dry nodule h-1. The average nodule biomass for this plantation was 220 kg ha-1. Rates of acetylene reduction were related to soil temperature, but not to soil moisture content. Combining these nodule biomass calculations with seasonal average acetylene reduction rates yielded an estimate of current annual nitrogen fixation of 60 kg N ha -1 for the plantation. This rate of annual nitrogen addition was very large in relation to the yearly nitrogen requirements of coniferous and deciduous forests in central Korea.

Original languageEnglish
Pages (from-to)332-337
Number of pages6
JournalJournal of Plant Biology
Volume48
Issue number3
Publication statusPublished - 2005 Sep 30

Fingerprint

Alnus hirsuta
acetylene reduction
diurnal variation
nitrogen fixation
Korean Peninsula
plantations
seasonal variation
biomass
nitrogen
deciduous forests
coniferous forests
soil temperature
soil water content
growing season
assays

Keywords

  • Alnus hirsuta
  • Diurnal variation
  • Nitrogen fixation
  • Seasonal variation

ASJC Scopus subject areas

  • Plant Science

Cite this

Diurnal and seasonal patterns of nitrogen fixation in an Alnus hirsuta plantation of Central Korea. / Yoon, Young Lee; Son, Yo Whan.

In: Journal of Plant Biology, Vol. 48, No. 3, 30.09.2005, p. 332-337.

Research output: Contribution to journalArticle

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AB - We used an acetylene reduction assay to measure rates of nitrogen fixation on a 38-year-old Alnus hirsuta plantation in central Korea. The diurnal pattern of acetylene reduction changed significantly during May, August and October, typically varying by 3-fold throughout the course of the day. Maximum rates occurred at 3 p.m. in May and October, but at 6 p.m. in August. Increasing trends were evident during the early growing season, with sustained high rates from mid-May through late September; July had the highest rates, averaging 7.2 μmole g-1 dry nodule h-1. The average nodule biomass for this plantation was 220 kg ha-1. Rates of acetylene reduction were related to soil temperature, but not to soil moisture content. Combining these nodule biomass calculations with seasonal average acetylene reduction rates yielded an estimate of current annual nitrogen fixation of 60 kg N ha -1 for the plantation. This rate of annual nitrogen addition was very large in relation to the yearly nitrogen requirements of coniferous and deciduous forests in central Korea.

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