11 降雨下に於ける林木の水分附着量について
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概要
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The canopy-interception has been usually measured by the difference of the precipitation amount of two rain gage, one under the forest canopy concerned and one in the open. By this indirect method, true amount of interception is difficult to obtain on account of the ununiformity of precipitation under the canopy and the stem-flow being escaped. Another method of approach to the true interception amount which seems to surpass in exactness is to measure dirertly the maximum water storage of trees in the stand and evaporation during the storm. For this reason, as the component of canopy-interception, maximum storage amount of Pinus Thunbergii in the coastal forest of Chigasaki City, Kanagawa Prefecture was measured.(1) The maximum storage of pine shoots were 0.27 mm in average for the crown projected area and under natural rainfall of 1〜3mm per hour in calm conditions, water detention of the shoots attaind the maximum storage in 30〜40 minutes.(2) Pine has larger maximum storage and much water was sttached to the branch of the shoots than evergreen and deciduous broad leaves.(3) The maximum storage of trunk and larger branches increased with diameter 0.01〜0.09 gr per cm^2,and water attached to the larger branches and trunk was difficult to evaporate than smaller branches.(4) The maximum storage of pine computed from those of shoots, branches and trunk was 1〜1.3mm (for the projected crown area) in superior stands and 0.3〜0.5mm in young trees of 50〜100cm in height.
- 日本森林学会の論文
- 1950-02-25