黄柏塬自然保护区4种典型次生林林下药用植物物种多样性

采用典型取样方法，分别从不同群落层次的丰富度、均匀度、物种多样性指数和物种相似性指数等方面对黄柏塬自然保护区4种典型次生林（包括油松林、锐齿栎林、栓皮栎林、红桦林）林下药用植物物种多样性进行了分析。结果表明:1）4种次生林林下药用植物优势种和非优势种分化明显。2）红桦林林下药用植物物种多样性最低且与其余3种林分存在显著差异，油松林与栎类林间无明显差异。3）油松林、锐齿栎林、栓皮栎林林下药用植物物种相似性指数较高，红桦林林下物种分化明显，与其他3种林分的物种相似性指数较低。

Species Diversity of Understory Medical Plants in Four Kinds of Typical Secondary Forests in Huangbaiyuan Nature Reserve

Through the method of typical sampling, this paper investigated understory medical plant species diversity (MPSD) of 4 kinds of typical secondary forests (Pinus tabulaeformis, Quercus valiena var. acuteserrata, Q.variabilis and Betula albo-sinensis) in Huangbaiyuan Nature Reserve from the views of species richness, evenness index, species diversity index and similarity coefficient. The results are as follows: 1) there is an obvious differentiation between dominant species and non-dominant species of understory medical plants in four kinds of typical secondary forests. 2) B. albo-sinensis community presented the lowest MPSD, significantly different with the other three; no obvious difference in MPSD between P. tabulaeformis and oak community. 3) Species similarities of understory medical plants in P. tabulaeformis forest, Q .valiena var. acuteserrata forest and Q. variabilis forest were high; there existed an obvious species differentiation of B. albo-sinensis forest and the other three kinds of forests, the similarity coefficients of B. albo-sinensis forest and the other three kinds of forests were low.