Abstract:

To study the different stabilities of cultivated grassland communities between single seeding and mixed seeding methods in 2009, the structural features and biodiversities of plant communities in the cultivated grasslands in Dawu area were investigated. The results showed that the above-ground biomasses of cultivated grasslands had not significant difference between single seeding and mixed seeding methods in 2009. The proportions of Gramineae had not significant difference between single seeding and mixed seeding for the component of functional group and important value of grassland vegetation. The proportions of both Leguminosae and Cyperaceae in the cultivated grassland of single seeding were lower than that in the cultivated grassland of mixed seeding, whereas others were significant higher. The indexes of species richness and Simpson were significant difference between two seeding methods (P<0.05), whereas the indexes of Shannon-Wiener and Pielou were no significant difference. Therefore, the stability of mixed seeding was higher than that of single seeding.

Key words: Cultivated grassland, Single seeding, Mixed seeding, Community features, Biodiversity

摘要：

为研究相同建植年限单播、混播2种播种方式下，人工草地群落的稳定性，分别对大武地区2009年单播、混播人工草地群落结构和物种多样性进行分析。结果表明：2009年单、混播人工草地，群落地上生物量未出现显著差异；单播与混播相比，草地植被功能群组成与物种重要值中，禾本科所占比例未出现差异，豆科与莎草科所占比例较低，但杂类草所占比例高于混播草地；物种丰富度指数、Simpson 指数均存在显著差异（P<0.05）；而Shannon-Wiener指数与Pielou指数均不存在显著性差异。因此，2009年混播人工草地稳定性高于2009年单播人工草地。

关键词: 人工草地, 单播, 混播, 群落特征, 物种多样性