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苏南低山丘陵地处杉木自然分布区的北缘,因受立地条件的限制,杉木生长较慢,速生期短,衰老较早.现有的成林杉木多是在1957—1958年前后营造,林分林龄多数已达20年以上,因此,能否主伐利用?如何使更新经济效益较高?这就愈来愈成为杉木生产上急待解决的问题.为此,我们选用了在南京、镇江、苏州三地有关县、市伐取的30多株平均优势木树干解析资料、针叶养分(N)含量分析资料以及本所试验林多年生长定位观测材料,就杉木主伐年龄及其萌芽更新进行如下的初步探讨.
Due to the limitation of the site conditions, the growth of Chinese fir is slower, the short-term growth period is earlier, and the senescence is earlier because of the lowland and the hilly area of southern Jiangsu, which is mainly located in the northern margin of natural distribution of Chinese fir , Most of the stand ages reached more than 20 years, therefore, whether the main use of cutting? How to make the renewal of higher economic benefits? This is increasingly becoming an urgent need to solve the problem of fir production.To this end, we chose in Nanjing , Zhenjiang, Suzhou, the relevant counties and municipalities to take more than 30 average dominant tree trunk analysis of information, needle nutrient (N) content analysis of information and the test forest many years of growth positioning observation material, the Chinese fir cutting age and its germination Update the following preliminary discussions.