不同密度近熟杉木林套种毛竹研究

对密度为 2 2 5株 /hm2 ,375株 /hm2 ,6 0 0株 /hm2 的 3种近熟杉木林套种毛竹、裸地种竹和原近熟杉木林 (现杉木已采伐 )套种毛竹等 5种林分的成活率、新竹及竹鞭生长指标分析研究表明 :各种经营模式中 ,杉木近熟林套种有利于提高毛竹成活率及长竹率 ,但发笋长竹数以裸地种竹为最多 ;新竹的生长以原近熟杉木林套种毛竹的林分为最好 ,其次是杉木密度为 2 2 5株 /hm2 ,375株 /hm2 的近熟杉木林、裸地种竹和杉木密度为 6 0 0株 /hm2 的林分 ;单根竹鞭长和鞭节长有随林分郁闭度增大而增加的趋势 ,而总鞭长、竹鞭数及竹鞭断梢率则相反 ;鞭深的分布变化不很明显 ,但有随林分密度增大而变浅的趋势 ;从更新杉木林分看 ,近熟杉木林套种毛竹以杉木密度为 2 2 5株 /hm2 的较理想

A Study on Bamboo Cultivated under Different Density of Near Ripe Chinese Fir

This paper has studied five types of bamboo forests including three types of forests cultivated under different density of near ripe Chinese fir forests,bamboo forests cultivated on bare land and bamboo forests once cultivated under near ripe forest of Chinese fir,comparison on survival rate,the index of new bamboo and rhizome,showing that the bamboo forest cultivated under near ripe Chinese fir forests is advantageous to enhancing survival rate and growing-bamboo rate.but the forest cultivated on bare land has most number of new bamboo in different stands,the best bamboo is in the forest of the cultivated under near ripe forests of Chinese fir,the next are the forests cultivated under thd forest density of 225 trees per hectare,that of 375 per hectare,the forests cultivated on bare land,and that of 600 per hectare in proper order,the length of rhizome tends to increase with canopy density rising,but the total length of rhizome,number of rhizome and rate of broken tip of rhizome are opposite to it,and the depth of rhizome tends to be shallower with the stand density increasing,In point of the reforested Chinese fir stands,the density of 225 trees per hectare adapts best to growing bamboos cultivated under near ripe Chinese fir forest.