…In addition, there is a belief that frost resistance to the lowest temperatures in winter is important. Indices of accumulated temperature that are said to coincide well with the limits of plant distribution are the warm index (WI) and cold index (CI) of Jiro Kawakita and Tatsuo Kira. Empirically, 5°C is the threshold, and WI is the difference between the average temperature of months when the monthly mean temperature is over 5°C and 5°C, and CI is the difference between the average temperature of months when the monthly mean temperature is below 5°C and 5°C, accumulated over the course of a year (CI is expressed as a negative value). … *Some of the terminology that mentions "warm index" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…このほかに,冬の寒さにおける最低温度に対する耐凍性が重要だとの考えがある。積算温度についての指数で,植物の分布の限界とよく一致するといわれているのが,川喜田二郎・吉良竜夫の暖かさの指数warm index(WI)と寒さの指数cold index(CI)である。これは,経験的に5℃を閾値として,WIは月平均気温が5℃を越える月の平均気温と5℃との差を,CIは月平均気温が5℃よりも低い月の平均気温と5℃との差を,それぞれ年間で積算したもの(CIは負の値で表す)である。… ※「warm index」について言及している用語解説の一部を掲載しています。 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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