Abstract:

The caloric values were used to study the Pinus koraiensis population in broad-leaved Korean Pine forests in Changbai Mountain. The results suggested that various organs of Pinus koraiensis were considerably different in caloric values. The caloric values of old branches, one-or-two-year branches, old leaves and one-or-two-year leaves differed greatly from that of barks, root stumpages, stems and lateral roots (P<0.05). The caloric values of old branches and one-or-two-year branches differed significantly from that of lateral roots (P<0.01). Analysis on the average caloric value of whole plant showed a rank of branch>leaf>bark>stem>root. Caloric values of old branches and leaves were higher than that of one-or-two-year branches and leaves. The caloric value of root stumpages was higher than that of lateral roots. Caloric values varied significantly with tree diameter class and a wave-shaped distribution was found as increased in diameter-class. Pinus koraiensis in different seasons differed in caloric values. A higher value was found in autumn than in spring. Caloric values of Pinus koraiensis in moss, spruce-fir, Pinus koraiensis forest on high altitude were higher than Pinus koraiensis in broad-leaved Korean Pine forests. The biggest difference was found in lateral roots, the margin being 3 471 J·g^-1, and the smallest difference was found in stem, the margin only 1 075 J·g^-1.

Key words: Pinus koraiensis, caloric values, organ, broad-leaved Korean Pine forests, diameter-class