Evaluation of transpiration in plantation of Chamaecyparis obtusa based on sap flow measurement by Granier method

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  • Granier法による樹液流測定に基づくヒノキ林における蒸散量の推定 : 御手洗試験流域における観測例
  • Granier法による樹液流測定に基づくヒノキ林における蒸散量の推定--御手洗水試験流域における観測例
  • Granierホウ ニ ヨル ジュエキリュウ ソクテイ ニ モトズク ヒノキリン ニ オケル ジョウサンリョウ ノ スイテイ オ チョウズ シケン リュウイキ ニ オケル カンソクレイ

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Abstract

Sap flux densities of Chamaecyparis obtusa were measured by means of Granier method in the Ochozu experimental watershed of Kyushu University Forest in Fukuoka, Japan. Sap flux densities and transpiration rates were compared among different sized trees and the relationship between transpiration rates and climatic factors were discussed. Although sap flux densities significantly differed among the trees, their diurnal variation patterns, such as rise, peak and down time, were similar. Each sap flux density increased with vapor pressure deficit(VPD), but leveled off when VPD exceeded 25hPa. Sap flux densities tended to increase with diameter of breast height(DBH) in fine days, whereas they were similar regardless of DBH in cloudy days. Sapwood area in trees increased with DBH, and a high correlation was shown between them (R^2=0.78). Transpiration rate from a single tree increased with DBH regardless of weather, and high correlations between them were shown on a fine day (R^2=0.72) and on a cloudy day (R^2=0.62). These results indicated that transpiration rate from a single tree increased with DBH due to increase in sapwood area and the increase in sap flux density on fine days. Transpiration rate in the experimental plot was linearly related with Penman's potential evaporation (R^2=0.83). Since soil moisture was adequate during the experimental period, it could be suggested that the weather condition is mainly responsible for the variation of transpiration rate.

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