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Root Adaptation of Pinus densiflora Sieb. et Zucc. in the Differently Acidified Forest Soil in Korea  

Lee, Do-Hyung
Publication Information
Journal of Korean Society of Forest Science / v.93, no.1, 2004 , pp. 50-58 More about this Journal
Abstract
This study was conducted to investigate the relationship of development of root and soil condition and also to elucidate mechanical and physical stability according to distribution of roots of Pinus densiflora S. et Z. natural stands of 35 to 45 years of age with different soil pH condition. The average tree age in Gyeongsan stand was 42 years old which was 5 years older than that of Uljin stand, however average tree height in Gyeongsan stand(11.7m) was lower than that of Uljin stand(18.6m). In the root structure, remarkably different root pattern was shown between the two stands. Uljin stand showed longer in the total length of root than Gyeongsan stand and the ratio between length of horizontal and vertical root was almost same in Uljin stand, while Gyeongsan stand showed comparatively higher value in the horizontal roots. In total weight of root, Uljin stand showed much higher value(75.13kg) than Gyeongsan stand (41.28kg) and the amount of thin root was also showed higher value in Uljin stand(7.34kg) than Gyeongsan stand(1.23kg). In root development by soil depth, most of roots developed much more deeply into soil in Uljin stand than in Gyeongsan stand. As a result of analysis of the growth ring of the root, Uljin stand showed better root growth than that of Gyeongsan stand. In Gyeongsan stand having pH value(4.45), much modified roots, the abnormal root branch form such as fork, gun and rake type were appeared and it seemed to be attributed by the soil acidification. In conclusion, the root development pattern of Pinus densiflora is likely adapted to the soil condition especially acidification of soil and this caused in various modified roots. The pattern of root structure in the acidified soil was being adapted from well developed vertical root system to horizontal root system with small number of roots and these modified root structure will result in the reduction of growth and the resistance against wind, drought and pests of Pinus densiflora stand.
Keywords
acidification; branch form; growth ring; physical and mechanical stability; root structure;
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