杉木实生苗根生长势的研究

Studies on root growth potential(RGP) in chinese fir[ Cunninghamia lanceolata (Lamb)Hook] seedlings

研究了杉木实生苗根生长势的测定方法，根生长势与造林第１年成活率之间的关系。新根数量和新根总长与造林成活率密切相关，可以反映苗木的真实质量。通过对根生长势同苗木形态指标之间相关关系的分析，发现长度≥５ｃｍ的１级侧根数和苗木鲜重与根生长势相关紧密，地径、苗高、主根长等指标与根生长势相关不紧密。

Expression of RGP and relationships between RGP and seedling survival of chinese fir were studied.The results showed that number of white tips and their total length could be used as RGP indexes(RGPI).The relationship between RGPI and seedling survival was significant.It was also found that RGPI closely corelated with the length of lateral roots≥5cm and seedling weight but did not corelate with seedling height,diameter and its tap root length. Authors address College of forest environment and resource Nanjing Forestry University,Nanjing 210037 PRC