Freezing period

Japanese: 凍結期間 - とうけつきかん(英語表記)freezing period
Freezing period
Refers to the period in winter when the soil freezes and seasonal permafrost forms, or the period when lakes, marshes, bays, rivers, etc. freeze over and ship navigation becomes impossible. It can also be referred to as the number of days frozen. In eastern Siberia, coniferous forests lose their leaves during the freezing period, creating a deciduous coniferous forest belt. In the major Siberian rivers that flow into the Arctic Ocean, the freezing period lasts for eight months in the downstream and shortens as you move upstream, causing the river water to overflow and create vast boreal wetlands. [Shitara Hiroshi]

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
冬に土壌が凍結して季節的な凍土ができている期間,あるいは湖沼,内湾,河川などが結氷して船舶の航行が不可能になる期間を指す。凍結日数ということもある。東シベリアでは凍結期間中,針葉樹林が落葉して落葉針葉樹林帯がみられる。北極海に注ぐシベリアの大河川では下流での凍結期間が8ヵ月にも及び,それが上流に向かって短くなるので,河水があふれてはんらんし,広大な寒帯湿地をつくっている。【設楽 寛】

出典 株式会社平凡社世界大百科事典 第2版について 情報

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