Air temperature and the understory vegetation on an algific talus slope in Ashoro Research Forest, Kyushu University

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  • YAMAUCHI Kohei
    University Forest, School of Agriculture, Kyushu University
  • ENOKI Tsutomu
    Division of Forest Environmental Science, Department of Agro-environmental Sciences, Faculty of Agriculture, Kyushu University

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  • 九州大学北海道演習林における風穴の気温と風穴地の植生
  • キュウシュウ ダイガク ホッカイドウ エンシュウリン ニ オケル カザアナ ノ キオン ト カザアナチ ノ ショクセイ

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We investigated an algific talus slope in the Kiyokawa area of the Ashoro Research Forest, Kyushu University where we defined an algific talus slope based on the presence of cowberry (Vaccinium vitis-idaea) and the absence of miyako-zasa (Sasa nipponica). We measured air temperature in rock crevasse (air temperature in the algific talus slope) and air temperatures in a ventilation shelter set up 1.3 m above the ground on a slope about 10 m away from the crevasse (air temperature outside the algific talus slope) from November 2022 to October 2023. The maximum and minimum air temperature in the algific talus slope during the measurement period were 8.8°C and –16.7°C, respectively, with an average of -0.7°C. The maximum and minimum air temperatures outside the algific talus slope were 31.6°C and -19.2°C, respectively, with a mean of 7.0°C. In August, the air temperatures outside the algific talus slope exceeded 30°C, while the air temperature in the algific talus slope remained around 5°C. A warm wind-hole was identified on the upper slope of the algific talus slope site in January 2023. We observed Vaccinium vitis-idaea and Rosa acicularis representative of algific talus slope in Hokkaido, while Sasa nipponica and Kalopanax septemlobus outside the area.

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