Application of the heat pulse method of climbing plant-measurement of transpiration rate on Passiflora caerulea stem supported on Pargora.

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  • つる性植物へのヒートパルス法の適用―パーゴラに誘引したトケイソウ（Ｐａｓｓｉｆｌｏｒａ　ｃａｅｒｕｌｅａ）の蒸散量測定―
  • ツル セイ ショクブツ エ ノ ヒートパルスホウ ノ テキヨウ パーゴラ ニ ユウイン シタ トケイソウ Passiflora caerulea ノ ジョウサンリョウ ソクテイ

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To evaluate the transpiration rate of climbing plant, the heat pulse method for measuring sap flow in passion flower (Passiflora caerulea) stems supported by Pargola was applied and tested. Because a problem existed with precision of measurement at a high flow velocity with the conventional heat pulse method, data of the time at which the temperature difference was maximal were also recorded. The rate of water uptake from the cut stem base had a close relationship with the heat pulse velocity. Thus, it is possible to quantify the transpiration rate of passion flower, which was calculated as 0.22-16.3 l/day among three plants. We evaluated a transpiration characteristic under various light-receiving conditions by covering the Pargola by sheets. A close relationship was also suggested between the structural shape of the pergola and plant species wrapped around it.

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