FONT SIZE:
青森県弘前市の水田で積雪前に出現した赤褐色粒子の観察
大高, 明史;菊池, 智子
Permalink : http://hdl.handle.net/2115/49048
KEYWORDS : アカシボ;赤褐色粒子;水田;弘前;Akashibo;reddish-brown particles;rice paddy;Hirosaki
Abstract
赤雪の一種であるアカシボの発生が知られている青森県弘前市の水田で, 積雪前に赤褐色に着色したプールが観察された. 着色物質中に含まれている球形の赤褐色粒子は, 尾瀬ヶ原で融雪期に見られるアカシボ粒子に比べて小さいものの, 一般的な外部形態は両者でよく似ていた. 着色したプールには多様な微生物群集が見られたが, 特定の藻類の顕著な増殖は確認されなかった. また, 降水後にいったん見られなくなった赤褐色粒子が, 数日内に再び現れることが観察された. こうした点から, 赤褐色の粒子は, 藻類とは無関係に短期間で生成される可能性が示唆された.
Before snow coverage, reddish-brown colored pools were found in the rice paddies in Hirosaki, Aomori Prefecture,northern Japan, where a kind of red snow “Akashibo”occurred in snow-melting seasons. The pool deposits contained spherical reddish-brown particles, which resemble those in the “Akashibo”particles in the general structure but significantly smaller than the latter. There was no prominent increase in any specific algae in the paddy pools. The reddish-brown particles appeared within several days after they once disappeared due to the outflow and/or disturbance of the pool sediments by rain and snowfall. These observations suggest that the reddish-brown particles might be generated for a short period irrespective of algal blooms.
Before snow coverage, reddish-brown colored pools were found in the rice paddies in Hirosaki, Aomori Prefecture,northern Japan, where a kind of red snow “Akashibo”occurred in snow-melting seasons. The pool deposits contained spherical reddish-brown particles, which resemble those in the “Akashibo”particles in the general structure but significantly smaller than the latter. There was no prominent increase in any specific algae in the paddy pools. The reddish-brown particles appeared within several days after they once disappeared due to the outflow and/or disturbance of the pool sediments by rain and snowfall. These observations suggest that the reddish-brown particles might be generated for a short period irrespective of algal blooms.
FULL TEXT:PDF