萌芽杉木与杂交马褂木混交效果分析

Mixed Effect of Germinated Cunninghamia lanceolata with Hybridized Liriodendron chinensis× Liriodendron tulipifera

采用标准地调查、树干解析等方法对福建省明溪县城关乡大坪村8年生的萌芽杉木纯林及萌芽杉木、杂交马褂木混交林的树高、胸径、蓄积量等进行对比分析,结果表明混交林萌芽杉木的平均胸径、树高、单株材积、林分蓄积量和优势木树高分别比杉木纯林高12.8%、10.7%、35.0%、34.4%和11.4%;混交林杂交马褂木的平均胸径、树高、单株材积、林分蓄积量和优势木树高分别比杉木纯林的人工实生杉木高67.6%、61.5%、323.1%、319.6%和77.6%;混交林的林分总蓄积比杉木纯林高103.4%;混交林林分地上部分总生物量比杉木纯林高85.9%;混交林杂交马褂木与萌芽杉木除在4~6m 高度处存在种间竞争外,其他空间分布合理,有效提高了林地生产力.

The tree height,DBH and the volume of eight-year-old germinated pure forest of Cunninghamia lanceo-lata,and the mixed forests (germinated Cunninghamialanceolata and Liriodendronchinensis× Liriodendrontu-lipifera)in Daping Village,Chengguan township,Mingxi County,Fujian Province were compared and analyzed by sample plot investigation and stem analysis methods.Result shows that:the average DBH,the tree height,the indi-vidual volume,the stand volume and the dominant height of germinated Cunninghamia lanceolata in the mixed for-est increased by 12.8%,10.7%,35.0%,34.4% & 11.4% respectively than that of the pure forest;the average DBH,the tree height,the individual volume,the stand volume and the dominant height of Liriodendronchinensis× Liriodendrontulipifera in the mixed forest increase by 67.6%,61.5%,323.1% & 319.6% and 77.6% respec-tively than that of pure and artificial seedling forest of Cunninghamia lanceolata;the total volume and above ground biomass of the stand in the mixed forest increase by 103.4% & 85.9% respectively than that of the pure forest;there was interspecific competition between Liriodendronchinensis× Liriodendrontulipifera and germinated Cun-ninghamia lanceolata in the mixed forest with the height of 4-6 m,however,rational distribution in other space, and finally could improve the forest land productivity effectively.