通过对越南同奈天然文化自然保护区天然阔叶和半落叶林中灌木高度和盖度以及草本盖度对胖大海幼树幼苗密度大小影响的研究,探讨灌木草本对胖大海种群更新及其可持续发展的影响。结果表明:灌木盖度对胖大海幼树幼苗更新密度有显著影响,在3个优势度等级林分随着灌木盖度的逐渐增加,胖大海幼树幼苗更新密度呈单调下降,灌木高度与胖大海幼树幼苗密度的回归关系符合模型:y=a+bx+cx~2;不同灌木盖度和高度等级与胖大海更新幼树幼苗密度呈显著相关,优势度一级和二级林分中灌木高度在300~400 cm且盖度<40%,胖大海幼树幼苗密度为2 500~3 000株/hm~2;当灌木高度<200 cm且其盖度在70%以上时,胖大海幼树幼苗密度为500~1 000株/hm~2;优势度三级林分中灌木高度300~400 cm和盖度<40%时,胖大海幼树幼苗密度为3 000~4 000株/hm2;胖大海幼树幼苗密度随着草本盖度的增加而逐渐下降,3个优势度等级林分胖大海幼树幼苗密度和草本盖度的回归模型为:y=a×exp(-bx);胖大海幼树幼苗更新密度受草本盖度和灌木盖度因素综合作用影响,回归关系符合模型:y=a+b_1x_1+b_2x_2+c_1x_1~2+c_2x_2~2+dx_1x_2,灌木盖度低等级和草本盖度<30%,幼树幼苗密度最高值为2 500~3 000株/hm~2,灌木盖度增高和草本盖度为80%以上,密度为500株/hm~2以下,灌木草本盖度增加以及灌木高度较低不利于胖大海幼树幼苗的更新。因此,胖大海天然更新培育或人工林经营中,应注意清除灌木、草本,为胖大海幼树幼苗生长提供适宜的环境,促进胖大海幼树幼苗存活与生长。 Through the research on the effects of shrub height and cover of natural broad-leaved and semi-deciduous forests and the herbage coverage on the density of sapling seedlings in Dong Nai Nature Reserve in Vietnam, The impact of sustained development. The results showed that shrub coverage had a significant effect on the regeneration density of young sapling seedlings. With the increase of shrub cover, the regeneration densities of young saplings decreased monotonously in the three dominance grades, The regression relationship between saplings density of saplings met the model: y = a + bx + cx ~ 2. There was a significant correlation between different shrub coverage and height classes and sapling density of saplings, Shrub height is 300-400 cm and coverage is less than 40%, sapling seedling density is 2 500-3 000 plants / hm 2; when shrub height is less than 200 cm and coverage is more than 70% The seedling density of young saplings was 500-1 000 plants / hm 2. When the shrub height was 300-400 cm and the coverage was less than 40%, the saplings density of saplings was between 3 000 and 4 000 plants / hm2. The seedling density of sapling decreased gradually with the increase of herbaceous cover. The regression model of sapling density and herbage cover of saplings was: y = a × exp (-bx) . The density of sapling seedling in Chimonanthus praecox treatment group was affected by the combination of herbality and shrub cover, and the regression relationship was in accordance with the model: y = a + b_1x_1 + b_2x_2 + c_1x_1 ~ 2 + c_2 x_2 ~ 2 + dx_1x_2, shrubs with low coverage and herbaceous coverage less than 30%. The highest seedling density of saplings was 2 500 ~ 3 000 plants / hm 2, the coverage of shrubs was increased and the cover of herb was more than 80% The density of 500 plants / hm ~ 2 below, shrub herb coverage increased and shrub height is not conducive to the renewal of sapling seedlings. Therefore, the natural renewal of fat sea or artificial forest management, should pay attention to remove shrubs, herbs, saplings for the growth of young saplings to provide suitable environment for the growth and promotion of sapling seedlings.