アカハンノキの花粉沈積
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TSUKADA, Matsuo (Dept. Bot., Univ. Wash., Seattle, WA 98195 U.S.A.). 1982. Pollen deposition of Alnus rubra Bong. Jap. J. Ecol., 32 : 405-414. Total pollen deposition of Alnus rubra was 5,114 grains per cm^2 at College Hill (47°35′32″N lat., 122°09′09″W long.; alt. 91m), Bellevue, Washington, during the 1975 maximum flowering period (March 23-30). The amount of Alnus pollen deposition on each phenological day (11 : 00-11 : 00) was proportional to the hourly cumulative temperature between 11 : 00 and 15 : 00 hours (r=0.964). During this period, the pollen deposition rose steeply from 6.0±4.0 to 34.4±33.0 (gr cm^<-2> hr^<-1>). Two depositional peaks, 23.3±22.8 (5 : 00-6 : 00) and 42.6±41.6 (16 : 00-17 : 00), were also observed ; in the former case pollen emitted mostly on the preceding day was probably brought down by the descending wet airmass, and in the latter, it was deposited from near-surface (probably below 50 m high) by gradually descending air. Thus, the daily descending air should prevent long distance transportation of Alnus pollen. Taking theoretical analysis of pollen dispersal into the air into account, this fact suggests that the majority of the pollen deposits within a radius of 2.0 km. Out of the total Alnus pollen deposited at the site, about one half (2,435 gr cm^<-2>) were forced to settle on the ground by rains which have the effect to even pollen concentration in a wide region.
- 日本生態学会の論文
- 1982-09-30
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