乳源木莲生长形质、林分分化及空间利用能力的混交效应

Mixed Effects on Growth Form Quality,Stand Differentiation and Spatial Utilization Ability of Manglietia yuyuanensis in Cunninghamia lanceolata-Manglietia.yuyuanensis Mixed Forest

研究了福建沙县32年生乳源木莲纯林和杉木乳源木莲混交的乳源木莲系列生长形质、林分分化及空间利用能力特征。结果表明:乳源木莲树高、胸径、单株材积等生长性状有显著促进混交效应,乳源木莲枝下高有显著促进混交效应,乳源木莲尖削度有显著抑制混交效应,但混交林培育对乳源木莲胸高形数、枝下高比例和树干圆满度无显著性影响。乳源木莲相对胸径变异系数,Ⅱ、Ⅲ级木以下株数比例有显著抑制混交效应。乳源木莲冠长、冠幅、冠形率、树冠体积、树冠表面积、生长空间指数、生长空间竞争指数等性状有显著促进混交效应。研究结论认为,杉木乳源木莲混交林培育可显著促进乳源木莲生长,提高干形形质,缓解林木竞争与分化,提高空间利用能力,模式在同类生境条件地区可以推广。

We studied the growth,stem form,stand differentiation and space utilization characteristics of Manglietia yuyuanensis in 31-year-old M.yuyuanensis,and Cunninghamia lanceolata-M.yuyuanensis mixed forest in in Shaxian County,Fujian,China.The growth characteristics of height,DBH and individual volume of M.yuyuanensis had significant promotion mixed effect.Branch height of M.yuyuanensis had significant promotion mixed effect,taperingness of M.yuyuanensis had significant inhibition mixed effect,but the mixed forest cultivation had no significant effect on the breast height form factor,branch height ratio and stem fullness.The coefficient of variation of relative diameter and the number ratio of below grade II and III forest wood of M.yuyuanensis had significant inhibition mixed effect.The crown length,crown width,crown length,crown shape rate,crown volume,crown surface area,GSI and GSCI of M.yuyuanensis had significant promotion mixed effect.Therefore,the cultivation of C.lanceolata-M.yuyuanensis mixed forest can significantly promote the growth,improve stem form quality,alleviate tree competition and differentiation,and improve space utilization ability of M.yuyuanensis,and the model can be extended in areas with similar habitat conditions.