中文摘要：

采用“空间代替时间”的方法，对云南哀牢山徐家坝地区湿性常绿阔叶林及不同类型次生植被中木本植物幼苗的种类组成、数量及更新方式等进行了调查。结果表明：在所有调查样地中，共记录到木本植物幼苗46种，其中乔木31种、灌木15种。荒草地、滇山杨林、栎类萌生林、原生林4种不同植被类型的幼苗密度分别是（421．9±59．5）、（34．4±8．1）、（31．6±7．2）、（18．5±6．6）株·25m^-2。随着演替的进行，灌木的比例逐渐减小，乔木的比例则逐渐增加。在森林恢复演替过程中，处于演替初期的荒草地灌木萌生更新占优势，到了演替后期则以乔木萌生幼苗更新为主。随着群落演替进程的增加，幼苗密度逐渐减少，幼苗生活型和木本植物的幼苗更新方式均发生变化。

英文摘要：

By using space-time substitution method, an investigation was made on the species composition, density, and regeneration mode of woody plant seedlings in the primary moist evergreen broad-leaved forests and different type secondary vegetations in Xujiaba region of Ailao Mountains, Yunnan. The woody plant seedlings were of 46 species, including 31 tree species and 15 shrub species. Their density in virgin grassland, secondary Populus bonatii forest, Lithocaupus re-growth forest, and primary forest was 421.9 ± 59.5, 34.4 ± 8. 1, 31.6 - 7.2, and 18.5 ±6. 6 stems · 25 m^-2, respectively. With the progress of succession, the proportion of shrubs decreased, while that of trees increased gradually. In the process of succession, the sprouting of shrub species was the dominant regeneration pattern at the early stage （grassland） whereas that of tree species was the major regeneration strategy at the late stage （ primary forest）, the density of woody plant seedlings decreased gradually, and the life-form and regeneration modes of the seedlings changed.