Estimation of Annual Canoppy Interception by Lithocarpus edulis Nakai

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  • マテバシイ林における年間樹冠遮断量の推定
  • マテバシイリン ニ オケル ネンカンジュカン シャダンリョウ ノ スイテイ

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Abstract

To estimate annual canopy interception loss, observations of gross rainfall, throughfall and stemflow were made in mature Lithocarpus edulis Nakai stand at the Kyushu University Forests in Fukuoka prefecture from 11 July 2000 to 10 July 2001. To obtain continuous long-term dataset, rainfall measurement were conducted by plural tipping bucket raingages. Due to large spatial variability, throughfall data obtained by tipping bucket raingages which were calibrated by manual measurements with 36 storage type raingages. The results showed that the amount of annual gross rainfall was 1539.9mm, whereas throughfall and stemflow were 457.0mm (29.7% of gross rainfall) and 779.3mm (50.2%of gross rainfall) respectively. These results clearly showed that the effect of throughfall was relatively small compared to that of stemflow in this stand. Consequently, estimated annual canopy interception loss was 309.6mm (20.1%of gross rainfall) in this study.

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