Effect of species diversity on invasion risk of introduced forage plants

本研究的目的是通过实地调查和实地试验，了解“物种多样性对引种饲料植物入侵风险的影响”。1. 这片草原作为马的栖息地一直被保存下来，是我国国家自然保护区之一。几年前，小松高冈和本山主要种植结缕草等本土植物。小松冈在12年多的时间里由原生草为主转变为外来草为主。但是，Ougiyama并没有改变。2. 外来草不能在物种丰富度高、本土植物密度大的花盆中生长。3. 本山原生植物具有丰富的匍匐基因型。由于这些基因型具有较高的裸地恢复能力，因此可以防止引进饲料植物的入侵风险。

The object of this study is to know the "Effect of species diversity on invasion risk of introduced forage plants" through field survey and field experiments. 1. This grassland has been maintained as habitat of native horse that is one of national monument of our country. Few years ago, Komatugaoka and Ougiyama was dominated by native plants such as Zoysia japonica. Komatugaoka changed from native grass to alien grass dominated grassland for over 12years. But, Ougiyama was not changed. 2. The alien grass can't grow in a pot of high species richness and high density of native plant. 3. There are rich creeping genotypes of native plants in Ougiyama. These genotypes would prevent invasion risk of introduced forage plants because these genotypes have high re-covering ability of bare land.