以山西省三交林场火烧迹地为研究对象，采用群落调查方法，分析了在自然更新下的不同植被恢复类型（油松人工林、灌木林、草本丛）下物种的组成及生物多样性。结果表明：（1）与对照相比，重度火烧后，草本丛的优势种重要值变化不明显，但喜阴耐旱的植物重要值显著升高；而灌木林主要以阳生耐旱草本植物占主要优势；油松人工林林分群落结构变化只是在灌木层和草本层中一些物种的更替。（2）重度火烧后所有植物的Simpson多样性指数均大于对照样地，油松人工林在重度火烧后多样性明显升高，油松人工林＞草本丛＞灌木林地。说明重度火烧2a后，不同类型植被恢复仍有一定的变化。%Taking fire slash (burned area) in Sanjiao Forest Farm of Shanxi Province as the research object ,adopting the method of community investigation ,composition and biodiversity of species under the different vegetation resto‐ration (plantation ,shrub and herb plexus of Pinus tabulaeformis) under natural regeneration were analyzed .Result shows that :1) Compared with controls ,after severe burn ,change of important value of the dominant species for herb plexus is not obvious ,important value of shade‐requiring & drought‐tolerant plant increase significantly ;shrub‐bery mainly predominated by sun‐requiring drought‐tolerant herbal plant ;changes of community structure for Pinus tabulaeformis plantation are only in some of the species in the shrub layer and herb layer .2) After severe burn all the plants of Simpson’s diversity index are greater than that of CK ,diversity of Pinus tabulaeformis plantation in‐crease significantly after severe burn;Pinus tabulaeformis plantation > herb plexus > shrub land .It indicates that after severe burn 2 years later ,different types of vegetation restoration are still have some changes .
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