毛竹混交林鞭系结构特征的研究

Study on Structural Features of Underground Bamboo Rhizome System in Mixed Stands of Moso and Chinese Fir

采用固定标准地法，对尤溪县包溪林业采育场１９７４年在毛竹林皆伐迹地上营造杉木纯林后形成的杉木毛竹混交林进行地下结构的调查。结果表明，杉木对毛竹地下结构的生长有一定的促进作用，对毛竹竹鞭向纵深延伸、壮芽数的比例提高有促进作用。杉木密度为９００～１３５０ 株／ｈｍ ２时，壮龄鞭比例比较高，毛竹地下结构比较优化，更新快；毛竹竹鞭有９２．８％ 分布在０～４０ｃｍ 土层中，其中０～２０ｃｍ 土层中占６０ 以上，大于４０ｃｍ 土层中仅占７．２％ ；杉木能促进竹鞭向纵深发展，随杉木密度的增加，０～２０ｃｍ 层鞭根减少，２０ｃｍ 以下鞭根明显增加，岔鞭数加大。

Investigations are conducted by method of fixed standard plot on structures of underground bamboo rhizome system in mixed stands of Moso and Chinese fir evoloved from afforestation of pure Chinese fir in clear felling blank of Moso stands at Baoqi forest farm of Youqi County,Fujing Province in 1974.It shows that Chinese fir can improve the growth of underground bamboo rhizome to a certain extent,and promote longitudial extention of rhizome,and raise ratio of vigourous buds.As the density of Chineses fir ranges from 900 pcs/ha.to 1350 pcs/ha.,ratio of vigourous rhizome is higher,underground rhizome structure appears more optimal,and fast regenerated.92.8% of the underground bamboo rhizome is scattered in the soil horizone of 0～40 cm deep,in which over 60% of them is restricted in one of 0～20 cm deep,and with only aboout 7.2% in one of over 40 cm deep.Chinese fir can accelerate in depth growth of rhizome,with density of Chinese fir increasing,rhizome and root in soil horizone of 0～20 cm deep is decreased,on the countrary,one in soil horizone of over 20 cm deep is sharply up,branching off rhizome is raised quantatively.