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| Abstract |
地球温暖化に対する森林土壌の機能変化を予測することは，森林の生態系サービスを評価する上で重要な課題である。しかし温帯森林での受動型オープントップチャンバー（OTC）の使用例は少ない。本研究では，北海道演習林の林内に自作のOTC を設置し，土壌の温度，凍結融解頻度，含水率への効果を主に季節性，斜面方位，OTC の有無から明らかにした。年間でOTC 内は外より地温が高かったが，状況によりその効果は様々...だった。地温の日平均値，日最高値，最低値および日較差において，季節性，斜面方位，OTC 処理の間に相互作用があり，これは日最高，日平均，日較差において，OTC 内外の差が北斜面と比較して南斜面で大きいことによっていた。冬期は北斜面，南斜面とも土壌凍結融解頻度がOTC 内で有意に増加した。OTC 内では含水率の低下も見られた。以上より，受動型OTC は，冷温帯落葉樹林内でも，十分に土壌への環境ストレスを増加させる効果があることが明らかとなった。
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.show more
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