オオシマザクラ植栽群落の花粉生産

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A cherry community of Prunus lannesiana var. speciosa, which has been established for about 30 years, was studied during the period 1992-1994 to ascertain the production rates of pollen, flowers and fruits. The study community which is in Narukawa-Enchi (Ikoma Mountains, Osaka Prefecture) was originally planted for recreational and ornamental purposes. The number of tree trunks in the 566.1-m^2 plot is 51, and the mean trunk diameter is 18.6cm with a range of 12-26cm. The fall rates (in terms of number and dry weight) of flowers and fruits in the study community were measured using 20 litter traps, each 50×50cm in the trap mouth area. Mean pollen yields per flower were 14.94×10^3 grains and 0.6908mg in 1992, and 24.62×10^3 grains and 0.5926mg in 1993. The numerical ratio of pollen grains to ovules (P/Ov ratio) was 7.5×10^3 in 1992 and 12.3×10^3 in 1993, as there are two ovules in each flower. The dry weight of a single pollen grain, obtained by dividing the weight by the number of pollen grains, was 48.2×10^<-6>mg in 1992 and 26.1×10^<-6>mg in 1993. Pollen production rates, obtained by multiplying the pollen yield per flower by the total number of open flowers with ovaries, immature and mature fruits in a 1-ha community, were estimated to be 0.171-0.694 (mean, 0.475)×10^<12> grains/ha/yr and 7.9-18.2 (mean, 14.3)kg/ha/yr. The investment of photosynthates (dry-matter production) in sexual reproduction was 496.6-2, 205.8 (mean, 1, 288.7)kg/ha/yr, of which pollen allocation accounted for 0.8-1.6% (mean, 1.3%).
日本花粉学会の論文
2007-12-31

オオシマザクラ植栽群落の花粉生産

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