After fall, the total amount dropped again and grasses, Urticaceae, and Humulus became important contributors. The present investigation also showed that the airborne pollen spectrum did not reflect the floristic composition in the vicinity of the collection site. A great many individuals from more than 100 families grew naturally or in cultivation in the area within 1-km distance from the collection site. However, because they were basically zoophilous, none of them proved to be important donors to the airborne pollen assemblage. Among the cultivated plants found around the collection site, only Casuarina , Bischoffia , and Liquidambar were remarkable.
Pollen allergy is among the major topics in aeropalynology.
In Taiwan, a mountainous subtropical island, the pollen spectrum in the air appears much more complicated than that of temperate regions. In conclusion, further study of these five taxa on the correlation between their individual pol len concentration and the allergenicity, especially that of Broussonetia papyrifera , appears crucial. Literature Cited Berggren, B., S. Nilsson, and G. Boethius. Diurnal variation of airborne birch pollen at some sites in Sweden. Chao, I. T., L. F. Chen, and J.T. Ehieh.