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老芒麦生物学特性及群落结构特征随着利用年限的增加而发生明显的变化。结果表明 ,入侵植物种数随着利用年限的增加呈逐渐增加的趋势。老芒麦在草地群落中相对生物量、相对多度和相对盖度随着利用年限增加而明显下降 ,而入侵植物相对生物量、相对多度和相对盖度则明显增加。老芒麦的重要值随着利用年限的增加而急剧降低 ,老芒麦在利用的第 2、3年占绝对优势 ,在第 5、6年入侵植物占重要地位 ,到第 9年才逐渐沦为次重要地位。老芒麦的草地物种多样性指数和均匀性指数随着利用年限的增加而逐渐增加 ,而生态优势度则逐渐降低
The characteristics of Bombyx mori and the characteristics of community structure changed obviously with the increase of the useful life. The results showed that the number of invasive plants increased gradually with the increase of the service life. The relative biomass, relative abundance and relative coverage of Elymus sibiricus in the grassland community decreased significantly with the increase of the useful life, while the relative biomass and relative abundance of the invasive plants increased significantly. The importance value of Elymus sanguinea decreased sharply with the increase of its years of use. Elymus spp. Occupies the absolute dominant position in the second and third years of its use, and invasive plants play an important role in the fifth and sixth years, The second most important position. The species diversity index and evenness index of Simengmucao grassland increased gradually with the increase of the service life, while the ecological dominance gradually decreased