SummaryCurrently, two cultivars ('Hoshinomidori' and 'Kiraka') and two lines ('Morokozawa' and 'Yamabuki') were cultivated as "white leaf teas" in Japan. Of these four white leaf teas, contents of several chemical compounds of new shoots in the first crop season were compared with those of 'Yabukita' as a common green leaf tea cultivar. Values of chlorophyll meter were quite lower in white leaf tea (0.6-8
Tetsuya OOISHI and Kunihiko AMANO 1 正会員 工修 (独)土木研究所 河川生態チ-ム 研究員(〒305-8516 茨城県つくば市南原1-6)2 正会員 工博 (独)土木研究所 河川生態チ-ム 上席研究員( 同上 )The purpose of this paper is to examine the trend of the riparian land-cover changes over the past 100 years quantitatively. We have analyzed the land-cover and the height of plants within riparian area in the year of 1890, 1947, 1961, 1974 and 1990 by using maps and aerial photos in the downstream part of Kokai river.The ratio of land-cover and the height of plants did not change significantly until 1970's, suggesting that riparian environment was in equilibrium. However, the area of the forest increased by 18% and the height of trees increased up to 15-20m from 1970's to 1990's. This can be attributed to the decline of the human disturbance. We have characterized three typical processes which lead to the growth of forest in riparian area in Kokai river, as follows. 1) Reed area was transformed to forest area.2) Trees in forest area have been no longer cut and used as fuel. 3) Cultivation activity has been lowered in riparian area. Above three processes seem to have been accelerated due to the change of the life style of people in the vicinity of the river.
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