Selection and Growth Potential Analysis of Chinese Fir Clones
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Received Date:
2013-10-20
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Abstract
Three groups of Chinese fir (Cunninghamia lanceolata) clone test stands, designed by stem, line and block assignments, were established at Huitong county and Suilning county of Hunan province in 1983, 1986 and 1997, respectively, including 33 clones and 2 contrasts. Base on three survey data (ranging from 4 to 31 years old), the variance analysis was used in the study. The results showed that significantly different existed in the diameter and height growths among the young-aged (4-7 years), the middle-aged (13 to 16 years) and mature (28-31 years) stands. Different clones followed different process of growth. Some clones grew slowly in young age period, fast in middle-aged period, and steadily in mature period. Two excellent clones still kept the earlier growth dominance in 31 years old, and their growth always showed good while planted at the 18 m site index or 16 m site index, their diameters and heights ranked the first and the second. The growth of the two excellent clones had temporal and spatial stabilities at certain extents. In block afforestation conditions, the tree height, DBH growth and volume per unit area of 13-year-old excellent clones were 20.1%~26.6%, 27%~31.1%, and 78.7%~92.8% higher than that of the check.
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