Validity of passive open-top chamber for soil warming experiment in cool-temperate deciduous forest stands on contrasting slope directions

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  • Hishi Takuo
    Division of Forest Environmental Science, Department of Agro-environmental Sciences, Faculty of Agriculture, Kyushu University
  • Yamauchi Kohei
    University Forest, School of Agriculture, Kyushu University
  • Inoue Sachiko
    University Forest, School of Agriculture, Kyushu University
  • Tashiro Naoaki
    Division of Forest Environmental Science, Department of Agro-environmental Sciences, Faculty of Agriculture, Kyushu University

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Other Title
  • 異なる斜面方位に成立する冷温帯落葉樹林における受動型オープントップチャンバーによる土壌温暖化実験の有効性
  • コトナル シャメン ホウイ ニ セイリツ スル レイオンタイ オチバ ジュリン ニ オケル ジュドウガタ オープントップチャンバー ニ ヨル ドジョウ オンダンカ ジッケン ノ ユウコウセイ

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Abstract

Predicting changes in functions of forest soil against to global warming is an important issue to assess forest ecosystem services. However, there are few examples of the use of non-powered passive open top chambers (OTC) in temperate forests. In this study, we set up the OTC in the forest of the Hokkaido Experimental Forest, and clarified the effects on soil temperature, freeze-thaw frequency, and water content mainly from seasonality, slope orientation and warming treatment effect using OTC. The soil temperature inside the OTC was higher than outside during the year, but the effect varied depending on the situation. There were interactions between seasonality, slope aspect, and OTC treatment in daily maximum, minimum, mean soil temperature, and daily range. The interaction was because the difference between the inside and outside of the OTC is larger on the south slope than on the north slope in terms of daily maximum, average soil temperature, and daily range. In winter, the frequency of soil freezing and thawing increased significantly in OTC on both the north and south slopes. There was also a decrease in water content within the OTC. From the above, it was clarified that passive OTC has the effect of sufficiently increasing environmental stress on soil even in cold temperate deciduous forests, although the stress effects are different depending on the situations.

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