@article{oai:kpu.repo.nii.ac.jp:00005160,
 author = {齋藤, 秀樹 and Saito, Hideki and 川瀬, 博隆 and Kawase, Hirotaka and 竹岡, 政治 and Takeoka, Masaji},
 journal = {京都府立大學學術報告. 農學, The scientific reports of Kyoto Prefectural University. Agriculture},
 month = {Nov},
 note = {林分1haあたりの雄花序, 花粉, 雌花及び種子の生産量(乾重と個数)について, 老齢ミズナラ林分の東向き斜面と西向き斜面とを比較検討し, 種子生産に関係する要因を考察した。各部分の生産量はトラップ法で測定し, 花粉については開花前の雄花序試料に含まれる花粉量と林分の開花雄花序数をかけて推定した。調査は1984年と85年に行った。両年度は種子豊作年と判断した。両林分の2年間の乾物生産は450∿500kg/ha・yrで, ここに占める雄性部分の割合は東向き林分が1/4,西向き林分は1/8であった。種子生産は西向き林分の方が多く, これは雌花数が多いためであった。種子生産の年変化は結実率に支配され, 雌花数自体の変化は無関係であった。この結実率は, 雌花に対して花粉の生産が多い年度に高くなった。花粉/種子の数比に年変化が認められなかったことから, 花粉生産量が結実率をとおして種子生産を支配したといえる。花粉/種子の数比は, 種子生産の少い東向き林分(19×(10)^6個)の方が西向き林分(5∿6×(10)^6個)より4倍程度多いが, 両林分の結実率は等しかった。このように, 向かい合って接する東向き及び西向き林分における雄性と雌性部分の生産量及び両者の両割合は異ることがわかった。, A comparison of east- and west-facing slopes with regard to the production rates of male flowers, pollen, female flowers and seeds in aged stands of Japanese white oak (Quercus mongolica FISCH. var. grosseserrata REHD. et WILS.) was made and the factors affecting seed production were discussed. Annual production rates (by dry weight and number) per 1-ha stand for each reproductive component except pollen were determined using ten litter traps (each 50cm×50cm in mouth area), while for pollen, this was done together with measurement of the amount of pollen contained in catkin samples before anther opening. The study was conducted in 1984 and 1985,years in which the seed crop was abundant. Dry-matter production rates for all reproductive parts including pollen in the two stands for the two study years were in the range of 450∿500kg/ha・yr, the proportion of male parts being one-fourth for the east-facing stand and one-eighth for the west-facing one. Seed production of the west-facing stand was higher than that of the east-facing one, due to the number of female flowers. Yearly changes in seed production were dependent on the seed-maturing ratio, i.e., the numerical ratio of sound acorns to female flowers, and not on the number of female flowers. The high seed-maturing ratio corresponded to the year in which a large amount of pollen was available for fertilization. Judging from the negligible difference between the two years in the numerical ratio of pollen to seeds, i.e., the number of pollen grains necessary for the formation of one acorn, seed production appears to be dependent on the number of pollen grains released into the air. There were no differences between the two stands in the seed-maturing ratio, while the numerical ratio of pollen to seeds in the east-facing stand (19×(10)^6), which had a low seed production, was about four times higher than that in the west-facing stand (5-6×(10)^6). Remarkable differences between the two stands, either neighboring or face to face, were found in the numerical proportion of male to female parts.},
 pages = {39--47},
 title = {東向き及び西向き斜面のミズナラ老齢林における花粉, 雌花及び種子生産の比較(林学部門)},
 volume = {40},
 year = {1988},
 yomi = {サイトウ, ヒデキ and カワセ, ヒロタカ and タケオカ, マサジ}
}