[Relationships between the pollen productions in sugi (Cryptomeria japonica D. Don) forests and the patterns of atmospheric scattering pollens in Toyama Prefecture--the example of Toyama Prefecture in 1990].
We investigated the geographical distribution of sugi (Cryptomeria Japonica D. Don) forests and the male flower-setting conditions of them in Toyama prefecture. The relationships between our findings and the atmospheric pollen scattering patterns were also studied. The results were as follows. 1. Atmospheric pollen counts and their scattering patterns were fairly easily explained by the geographical distribution of 30-year old sugi forests, the male flower-setting conditions and the first day pollen was scattered in those forests. 2. Total atmospheric counts and maximum sugi pollen peaks were significantly affected by the proximity of sugi forests at altitudes of less than 200 meter. 3. In the atmospheric pollen survey, the detected pollen counts decreased according to the distance between the observation sites and the sugi forests. And few pollen grains were observed from natural sugi forests growing at distances of 20 km to 30 km from the observation sites.
Taira
H
H
Department of Public Health, Faculty of Medicine, Toyama Medical and Pharmaceutical University.
Teranishi
H
H
Kenda
Y
Y
Keyaki
Y
Y
Shimizu
K
K
Kawai
Y
Y
D000388:Air / Q000032:analysis*; D000531:Altitude; D016468:Forestry; D005843:Geography; D007564:Japan; D011058:Pollen; D012621:Seasons; D014197:Trees; D014887:Weather