华南乡土树种在松杉林下生长及林下植物多样性研究

研究了11种华南乡土阔叶树种幼树在广东增城市林科所松杉人工林林下的生长表现,结果表明:4种壳斗科植物黎蒴、米锥、甜锥和槟榔青冈在移植后5 a均具有较高的树高和冠幅生长量,可作为人工林改造优良树种;香椿在前期生长表现良好,而移植后45 a生长速度有所下降,反映该树种随着年龄增长,其需光性加强,该树种仅适用于低密度人工林的改造;石笔木生长虽然稍慢,但其耐荫性较强,在林下生长良好,可作为次生林改造树种;樟树、枫香和火力楠等树种在林下生长不良.样方调查结果表明:松杉林下植物以耐荫性和鸟播植物为主.

Growth of Some Na tive Broad-leaved Trees and Plant D iversityin the Con iferous Planta tion of South Ch ina

The growth of 11 native broad-leaved tree species in a coniferous p lantation located in Zengcheng,Guangdong Province was studied. The result showed that the sap lings of four Fagaceae species (Castanopsis f issa, C.carlesii, C. eyrei, and Cyclobalanopsis bella) had vigorous growth in the p lantation during the first 5 years, whichwere excellent species in the ecological p lantations. The sap lings of Toona sinensis had rap id growth in the first 3years, but the growth declined in the fourth and fifth year. It had higher light requirement with its growing. It canbe used as reformed species in the low-density ecological p lantations. The sap lings of Tutcheria cham pionii wasshade-tolerant and showed good competition under the canopy. It can be used as the enrichment species for thereformation of secondary forests. The sap lings of Cinnam om um cam phora, L iquidam bar form osana, and M icheliam acclurei had relatively poor growth in the high-density ecological p lantations. The p lot investigation result indicatedthatmost understory species invading the p lantation were shade-tolerant and bird dispersed.