呼伦贝尔草甸草原不同退化程度草地群落物种组成特征-广东农业科学.PDFVIP

广东农业科学 2013 年第18 期 139 呼伦贝尔草甸草原不同退化程度草地 群落物种组成特征分析 李 杰 乌仁其其格 黄振艳 渊呼伦贝尔学院生命科学与化学学院 内蒙古 呼伦贝尔 021008冤 摘要 以呼伦贝尔草甸草原羊草+杂类草群落和贝加尔针茅+羊草群落为研究对象 对不同退化程度下的植物群落组成定量 分析研究遥 结果表明 随着草地退化程度的增加 群落物种组成逐渐单一 数量逐渐减少 其中代表草甸草原成分的物种重要值变 化较明显 群落伴生种的重要值随着退化程度的增加而降低 有些耐践踏尧适口性差的物种如寸草苔尧披针叶黄华尧糙隐子草等对 草甸草原具有一定指示作用的物种重要值具有上升的趋势曰群落物种组成发生明显变化 轻度和中度退化草地 以禾本科为优势 种 退化指示类的菊科植物的重要地位得到提升 中度退化区蔷薇科和毛茛科植物不 增加 重度退化阶段 多以耐践踏的菊科植 物尧莎草科和小型禾草占优势遥 关键词 草甸草原曰退化程度曰群落曰物种组成 + 中图分类号 Q948.15 4 文献标识码 A 文章编号 1004-874X渊2013冤18-0139-05 Analysis on characteristic of plant community species composition under different degeneration degree grassland in the meadow steppe of Hulunbuir LI J ie WUREN-Qiqige HUANG Zhen-yan 渊College of Life Sc ie nce and Che mis try Hulunbuir College Hulunbuir 021008 China冤 Abstract: The characteristics of community in the Leymus chinens is+ford community and Stipa baicale nsis community under different degeneration clegree grassland were investigated. The composition of community species was gradually unitary, quantity reduced , the important value of species changed obviously with grassland degeneration increasing in Hulunbuir meadow steppe. The species important values of bearing trample and palatability , such as Boeruera duriuscula, The rmops is lanceolata and Cle is toge nes squarrosa, increased gradually with grassland degeneration increasing. The grass and composite which reduced gradually in Stipa baicale nsis community reduced first then increased in Leymus chinensis community. The leguminous plant reduced, the