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Study on growth characteristics of three evergreen poplar clones in seedling stage

QIAN Lian-wen1,GUO Jian-hong2(1.College of Resources and Environment Science,Quanzhou Normal University,Quanzhou,Fujian 362000,China;2.TSL School of Business and Information Technology,Quanzhou Normal University,Quanzhou,Fujian 362000,China)  
There are only three evergreen poplar clones now,including A-65/27,A-65/31 and A-61/186.Easy cutting propagation,higher afforestation survival rate and fast-growing evergreen poplas clones with high yield and excellent wood quality are their common features.Tree species resources of south timber forests would be abounded significantly through extensively planting these poplar clones.The experiments of cutting and transplanting were made in order to understand the growth characteristics of evergreen poplar clones.The results showed that the cutting survival rates were higher than 90%.There was a clear fast-growing period for the growth of height and ground diameter in a year.High growth rate of height growth was mainly from June to September,and ground diameter growth mainly in August,September and October.The leaf area of A-61/186 was the largest in the three clones,but its growth range was the lowest.The leaf area of A-65/27 was bigger than A-65/31 in April but lower in September.And leaf area was mainly increased through growth of leaf width.The biomass of A-61/186 was the largest in the three clones also,and that of A-65/27 was larger than A-65/31 for one-year-old plant and lower for two-year-old plant.Biomass structure of three clones were all stemrootleaf for one-year-old and two-year-old seedlings.There were no significant differences among three clones in height,ground diameter,leaf area and biomass.
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