摘要
在退化羊草草原上耕翻播种羊草(Leymuschinensis)后,植物群落演替动态与群落特征变化规律的研究结果进行了报导.通过对1984~1995年野外实地观测所得数据进行分析,结果如下:羊草人工草地经过13年的演替群落丰富度(rich-ness)有所增加,种类组成出现差异.群落密度和地上生物量都为中期较高的峰型变化规律.群落的多样性指数和均匀性指数在后期有明显增加.羊草的重要值为前期迅速增加,中期相对稳定和后期下降的变化规律.13年的演替过程可划分为三个阶段:前3年(1983~1985)为羊草种群的增长阶段,群落组成为羊草十一、二年生杂类草群落;随后5年羊草种群处于绝对优势且相对稳定的地位,群落组成为羊草+冰草(Agropyronmichnoi)+多年生杂类草群落,此阶段也是羊草草地的最佳阶段;第三个阶段为后5年(1991~1995)此阶段羊草在群落中的作用减弱,多年生植物种类和数量有所增加,群落组成为羊草+冰草、变蒿(Artemisiacommutata)、阿尔泰狗娃花(Heteropapusaltaicus)+丛生小禾草群落.羊草人工草地正向天然羊草草原群落演变。
An analysis study on dynamics succession and characters of community in degenerated steppe of L.chinensis (steppe of Artemisia frigida) which planted L.chinensis for restoration from 1984 to 1985.The results showed that species richness per unit area (20 m2) was increased and the main component species in the community was changed.The density and biomass increased after planted (1984 ̄1985).There is a peak value after planting L.chinensis during the forth to eighth years and then decreased.Diversity index and evenness index increased obviously during the course of succession.Importance value of L.chinensis have increased obviously (1983 ̄1985) and have a peak value during the forth to eighth years (1986 ̄1990),then decreased after ninth years.The process of succession of community may be devided into three stages.The first stage is community of L.chinensis+short Lived plant (1 ̄3 years after planting);The second stage is community of L.chinensis+A.michnoi+perenial plants (4 ̄8 year);The thrid stage is community L.chinensis+A.michnoi.A.commutata+grass(9 ̄13 year).The direction of succession is oriented to the primary vegetation from the seventh year.
出处
《内蒙古大学学报(自然科学版)》
CAS
CSCD
1998年第1期96-101,共6页
Journal of Inner Mongolia University:Natural Science Edition
基金
内蒙古教育厅基金
内蒙古大学青年基金
中科院开放站基金
关键词
退化
羊草草原
人工草地
演替动态
群落
degenerated steppe artificial grassland succession dynamics