Seasonality of factors controlling N mineralization rates among slope positions and aspects in cool-temperate deciduous natural forests and larch plantations

Takuo Hishi, Rieko Urakawa, Naoaki Tashiro, Yuka Maeda, Hideaki Shibata

研究成果: ジャーナルへの寄稿記事

18 引用 (Scopus)

抄録

This study aimed to evaluate the spatial patterns of soil nitrogen (N) transformations in relation to slope aspect and position, and to investigate the main factors controlling N transformation patterns during both the growing and dormant seasons in cool-temperate deciduous natural forests and larch plantations in eastern Hokkaido, northern Japan. Net rates of N mineralization (NRminN) and of nitrification (NRnit) in surface soils on north-facing and lower slopes were higher than those on south-facing and upper slopes, whereas the net rate of ammonium-N production (NRamm) on south-facing and upper slopes was higher than that on north-facing slopes in both the natural forests and larch plantations. Both NRminN and NRnit were higher in the growing than in the dormant season, whereas NRamm was higher in the dormant season. The soil C/N ratio, water content, soil pH and frequency of freeze-thaw cycles were important variables affecting N transformation patterns in any season. In relation to seasonality, the solar radiation index, daily temperature range and earthworm biomass were important controlling factors only during the growing season, and watershed area and soil N concentration only during the dormant season, suggesting that biological control accompanied with wet-dry events were important factors affecting N transformations during the growing season, but that run-off water and chemical controls were important determinants of spatial variation in N transformations during the dormant season.

元の言語英語
ページ(範囲)343-356
ページ数14
ジャーナルBiology and Fertility of Soils
50
発行部数2
DOI
出版物ステータス出版済み - 9 28 2014

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Larix
seasonality
mineralization
plantation
plantations
Soil
Nitrification
nitrification
soil
growing season
ammonium
Ammonium Compounds
Japan
freeze-thaw cycle
chemical control
freeze-thaw cycles
soil nitrogen
earthworms
earthworm
biological control

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Agronomy and Crop Science
  • Soil Science

これを引用

Seasonality of factors controlling N mineralization rates among slope positions and aspects in cool-temperate deciduous natural forests and larch plantations. / Hishi, Takuo; Urakawa, Rieko; Tashiro, Naoaki; Maeda, Yuka; Shibata, Hideaki.

:: Biology and Fertility of Soils, 巻 50, 番号 2, 28.09.2014, p. 343-356.

研究成果: ジャーナルへの寄稿記事

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