Effects of thinning on soil nitrogen mineralization in a Japanese larch plantation

Yowhan Son, Woo Kyun Lee, Sang Eun Lee, Soung Ryoul Ryu

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Abstract

We measured soil nitrogen (N) mineralization and litter decomposition for four different thinning intensities [control (C), 10% (T10), 20% (T20), 40% (T40) thinning] during the first year after treatment in a 15-year-old Japanese larch plantation in central Korea. Initial soil moisture content increased in the thinned plots. Air temperature also increased with thinning intensity, however, soil temperature did not. Annual net N mineralization rates (mg N kg-1) for C, T10, T20, and T40 were 6.7, 7.2, 6.6, and 11.5, respectively. The heavily thinned plot showed higher annual N mineralization than control, lightly and moderately thinned plots, but differences were not statistically significant. Except for the T40 treatment, the ratios of annual net nitrification to annual net N mineralization were greater than 100%. Dry weight and N concentration in decomposing needle litter did not show any significant patterns with thinning intensity. The current results indicated that various levels of thinning for a young Japanese larch plantation had only a minor influence on soil N mineralization and litterfall decomposition during the first year following thinning.

Original languageEnglish
Pages (from-to)2539-2550
Number of pages12
JournalCommunications in Soil Science and Plant Analysis
Volume30
Issue number17-18
DOIs
Publication statusPublished - 1999 Jan 1

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ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science

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