作　　者： ; ;

机构地区： 华南师范大学生命科学学院生物科学系

出　　处： 《植物生态学报》 2000年第2期222-230,共9页

摘　　要： 对黑石顶森林次生演替过程中土壤种子库的研究表明：演替各阶段的种子库的种类组成以草本种、灌木种占优势，分别为20．35％～66．67％和16．09％～35．40％，乔木种的比例很小，为0．35％～11．76％；演替初期种子库的种类最多，为31种，针阔混交林阶段最少，为22种，阳生性常绿阔叶林阶段种类增加至30种，至中生性常绿阔叶林阶段基本保持稳定为25～26种。种子库中各层出现的物种数由上而下逐渐减少，表层（0～2cm）有18～31种，中层（2～5cm）有10～15种，下层（5～10cm）有4～11种；各层种子密度在演替初期和针阔叶混交林阶段由上而下递减，在常绿阔叶林阶段由上而下递增。演替各阶段土壤种子库间的相似系数都较大，在0．561～0．792之间，各群落种子库间的相似性形成一个由恢复初期群落种子库→针阔叶混交林种子库→阳生性常绿阔叶林种子库→中生性常绿阔叶林种子库的演替系列，反映了种子库所代表的群落间的演替关系。演替初期阶段种子库的组成与地上植被的种类组成较一致，达50％，而演替其它阶段的种子库与地上植被的种类组成差异较大，相似度仅为10％～30％。 The soil seed-banks of a secondary succession of lower subtropical forest in Heishiding Nature Reserve, Guangdong Province, were studied with results as follows: soil seed banks were numerically dominated by herbs and shrubs which made up 20% ~ 67% and 16% ~ 35 % of seeds respectively. Tree species accounted for between 0. 35% and 12% of seeds. The greatest richness of seed-bank species was found in the early successional sites (maximum richness 31 species). The lowest richness occurred in broad-leaved forest with 22 species. In evergreen broad-leaved forest dominated by heliophytes seed-bank richness increased to 30 species, while the seed bank of evergreen broad leaved forest dominated by mesophytes contained 25~26 species. The number of new species decreased with depth in the seed bank. 18~ 31 species were found in the surface layer (0~ 2cm ), 10~ 15 species in the middle layer (2~ 5cm) and 4~ 11 species in the lower layer (5 ~ 10cm ). In the early succession and mixed forest stages, the density of seed decreased with depth, but in the evergreen broad-leaved forest seed density increased with depth. The similarity coefficients of seed-banks were between 0. 551 and 0. 792 among all stages of the secondary successional series. The similarity of seed banks of secondary successional series indicated a successional trend: seed bank in restored community→mixed forest→evergreen broad-leaved forest dominated by heliophytes→evergreen broad-leaved forest dominated by mesophytes. Only in the early successional stages was the species composition of seed-banks consistent with that of the above ground community, in all other stages seed-bank and above ground species compositions differed.

关 键 词： 森林群落 次生演替 土壤种子库 广东 黑石顶

领　　域： [农业科学]