The relationship between radial growth and tracheid length in Pinus sylvestris var. mongolica grown a semi-arid land of China
2003
Qi, J. (Tottori Univ. (Japan). Faculty of Agriculture) | Furukawa, I.
Summary Variations in radial growth and tracheid length of Pinus sylvestris var. mongohca, collected from natural forests of Honghuaerji and artificial forests of Zhanggutai in China were studied. The mean ring width of the normal growth trees from natural forests were significantly larger than that from plantation, possibly due to the difference in the early period of radial growth. The relationship between tracheid length and ring number from pith could be represented by a logarithmical formula. Based on the formula, the point of 1% growth rate of tracheid lengths was considered the boundary for juvenile and mature wood. The juvenile zone ranges from 22nd to 25th ring from pith, which was not related to radial growth of trees from natural and artificial forests. Within the mature zone, variation coefficient of tracheid length in normal growth trees of natural forests is smallest among all the trees in artificial and natural forests, thus the tracheid length showed a constant tendency. Tracheid length of artificial forests was longer than that of natural forests. Furthermore, tracheid length was longer in normal growth trees than in slow growth trees from natural forests, but no difference in artificial forests.
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