Soil nitrogen transformations and availability in upland pine and bottomland alder forests

Tae Kyung Yoon, Nam Jin Noh, Haegeun Chung, A. Ram Yang, Yo Whan Son

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Soil nitrogen (N) processes and inorganic N availability are closely coupled with ecosystem productivity and various ecological processes. Spatio-temporal variations and environmental effects on net N transformation rates and inorganic N concentrations in bulk soil and ion exchange resin were examined in an upland pine forest (UPF) and a bottomland alder forest (BAF), which were expected to have distinguishing N properties. The annual net N mineralization rate and nitrification rate (kg N·ha-1·year-1) were within the ranges of 66.05-84.01 and 56.26-77.61 in the UPF and -17.22-72.24 and 23.98-98.74 in the BAF, respectively. In the BAF, which were assumed as N-rich conditions, the net N mineralization rate was suppressed under NH4+ accumulated soils and was independent from soil temperature. On the other hand, in the UPF, which represent moderately fertile N conditions, net N transformation rates and N availability were dependent to the generally known regulation by soil temperature and soil water content. Stand density might indirectly affect the N transformations, N availability, and ecosystem productivity through different soil moisture conditions. The differing patterns of different inorganic N indices provide useful insight into the N availability in each forest and potential applicability of ion exchange resin assay.

Original languageEnglish
Pages (from-to)2941-2958
Number of pages18
JournalForests
Volume6
Issue number9
DOIs
Publication statusPublished - 2015

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Keywords

  • Alnus japonica
  • Ion exchange resin
  • Nitrogen mineralization
  • Pinus densiflora
  • Soil moisture

ASJC Scopus subject areas

  • Forestry

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