新疆伊犁不同建植年限混播栽培草地植物多样性分析

lant diversity of mixed pasture with different years in the Yili regions of Xinjiang

对新疆伊犁不同建植年限混播栽培草地植物多样性分析表明,随建植年限的延长,栽培草地丰富度指数呈增加趋势,物种多样性、均匀度表现出先减后增趋势,生态优势度呈先增后减趋势,这种变化促进了原生群落中优良牧草的生长。建植3年的草地,群落植物多样性达到最高,表现出建植3年(Ⅲ)>建植1年(Ⅰ)>建植2年(Ⅱ)的规律。β多样性的分析结果表明,随草地建植年限的延长,相邻梯度间物种替代速率以较小的增幅增加,群落相似程度逐渐降低。草地群落达到了一个由生产稳定性向生态稳定性过渡的暂稳定状态。

Plant diversity of mixed pasture with different years was investigated in this study. The results of this study showed that the richness index increased, diversity index and evenness index firstly decreased and then increased, and dominant index firstly increased and then decreased when pasture years increased, implying that more years benefited the growth of native quality herbage. Plant diversity in the 3-years pasture was bigger than that in one year pasture, and the latter was bigger than that in 2-years pasture. The diversity slightly increased and the community affinity reduced between years. The pasture community reached a temporary balance from productive stability to ecological stability.