マツ属の耐凍性と分布 : I.耐凍性の季節変化

概要

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Seasonal variations of freezing resistance in 42 pine species which were planted at Kamigamo Experimental Station of Kyoto Univ. (about 35℃ N) were investigated with special reference to two thermal indices, mean warmth index (MWI) and mean temperature in the coldest month (MTCM) in native distributional regions. The timing of cold hardening in Kyoto differed significantly among pine species ; The species from northern or colder regions became hardy earlier than those from southern or warmer regions. The winter hardiness was closely related to MTCM. The degree of hardiness was different from each other by the groups of pines from eastern and western regions of continents. The difference between them seems to be caused from difference of continentality of the climate. The winter hardiness of pines appears to be more closely related to MTCM than MWI of their native habitats. Thus, it is postulated that very hardy pine species have evolved in highly contipental and winter cold climates.
日本生態学会の論文
1981-03-30