初论杉木种子园的园址选择

通过6个省内28个种子园的数据分析,发现位于杉木不同产区(北部产区、中心产区、南部产区)的种子园,其开花结实年龄、结实量、种子播种品质等均存在较有规律的差异。中心产区无性系一般开花结实迟于北部产区的无性系;产量和种子品质的年变幅大;历年平均产量、球果出籽率和种子发芽率显著低于北部产区。就上述趋势对影响杉木种子生长发育的主要环境因子进行了理论上的讨论分析,并提出杉木种子园园址选择的初步意见。

A PRELIMINARY EVALUATION ON THE SITE SELECTION OF CHINESE FIR (CUNNINGHAMIA LANCEOLATA) SEED ORCHARD

Through the data analysis of 28 seed orchards for Chinese fir (Cunninghamia lanceolata) which located in six provinces in China, it has been found out that the seed trees grow in seed orchards in central region of distribution of this species and the clones initiated in this region are later flowering and have lower sowing quality of seeds in first several years of fruiting phase than the trees grow in seed orchard in northern region of distribution and the clones from northern one. Ten or more after grafting, the seed yield and sowing quality of former can catch up with later one. Excessive precipitation and raining date in lollening period and dry in seeds developing stage (July-October) in central region and longly dry season in south region of distribution seems prevent them from high-yield and good quality of seeds. It is recommended that the seed orchard of Chinese fir had better to establish in basicly adopting location to this species but un-central region.