黑石顶森林中次生裸地上的群落演替进程研究

黑石顶人工林演变成的次生针阔混交林于1986年皆伐火烧成裸地，其恢复进程表明：次生裸地上群落恢复迅速，从由马尾松（Plnusm。）一木荷（Schimasuperba）一杉木（Cunninghamialanceolata）为主的针阔混交林开始，至1990年，森林群落已基本重建起来，其中乔木种类达42种，与样地原群落的相似系数为0．6250，物种多样性指数和均匀度指数略高于样地原群落。与1986年定位的其他样地上的群落按林龄由小到大视作一大于50年的演替系列进行比较，发现从裸地到针阀混交林，再到阔叶林的演替过程中，乔木种总数和个体密度趋于增加，物种多样性先迅速增加，然后呈现下降趋势，再缓慢增加。

COMMUNITY SUCCESSION ON SECONDARY BARE LAND IN HEISHIDING FOREST

An artificially bared plot of 1 600 m2 in Heishiding, Guangdong Province, was establishedin 1986 by clear cutting conifer and broadleaf mixed forest, removing all the trees, and all theground vegetation was cleared and burnt in the plot. In 1990, the natural regeneration of the vegetation in the plot was shown to be restored fast. The restoring process was started to develop fromPinus massonian- Schima superba-Cunninghamia lanceolata community, and the forest communityhad been basically restored within 4 years. There were 42 tree species in the plot. The species similari coefficient between the plot and the previous plot was 0.6250, and the the species diversity andevenness were higher than those in community of the original plot due to the influence from theneighbouring communities. Compared to other near-by plots set in 1986, the communities of Whichhaving different ages up to more than 50 years were suggested as a successional series, the numbersof tree species and individuals developed in the bared plot tended to increase rapidly in thebeginning, then decrease, and then increase again slowly.