摘要
对退化羊草（Ｌ．ｃｈｉｎｅｎｓｉｓ）草原围封后１１年的群落特征进行了研究分析．结果表明：退化草原在恢复过程中单位面积内植物种丰富度增加．但组成整个样地的种类成分变化不大．多样性指数中期增加后期呈现下降趋势，物种在群落中所占比例大小是造成多样性指数变化的主要因素，而与丰富度关系不大．均匀性指数在恢复过程中呈下降趋势．羊草、冰草（Ａｇｒｏｐｙｒｏｎｍｉｃｈｎｏｉ）、针茅（Ｓｔｉｐａ）在演替过程中呈持续增加趋势，相反，冷蒿（Ａｒｔｅｍｉｓｉａｆｒｉｇｉｄａ）、木地肤（Ｋｏｃｈｔｉａｐｒｏｓｔｒａｔａ）呈现下降趋势．１１年的恢复过程可划分为冷蒿＋丛生小禾草＋羊草群落，冷蒿群落向羊草群落的过渡阶段；羊草＋冰草、冷蒿＋丛生禾草群落和羊草＋冰草＋丛生禾草群落４个阶段．１１年的封育，退化群落并未恢复到羊草草原顶极群落的水平．
This paper is a analysis study on dynamics succession and characters of commnity in degenerated steppe of L. chinense (steppe of Artemisia frigida) which was enclosed for restoration from 1983 to 1993. The results showed that species richness per unit area (lm2￣10m2) increased annally but the main component species in the community was not changed obviously. Diversity index increassed in middle stage of restoratim succession and that the main reasons was species eveness.Homogeneity index decreased during succession. The population of L. chinensis,Agropyron michnoi,stipa grandis increased annually but population of Artemisia frigida decreased during succession. The type of community decided to level of productive forces, The density, aboveground biomass of the community have increased obviously after L. chinensis had changed constructive species. The degenerated steppe through 11 years restoration is different from primary communits of steppe of L. chinensis,the succession will be continues. The process of succession of community may be devided into four stages. The first stage is community of A. frigida+grow thickly lower grasses+L. chinensis (1￣3 Years after enclosed):The second stage is transition period from formation of A. frigida to formation of L. chinensis (4￣6 Years enclosed); The third stage is community of L. chinensis+A. michnoi. A. frigida+lower grasses (7￣9 yeasr); The fourth stags is L. chinensis+A.michnoi+grow thickly grasses (9￣11 years after enclosed).
出处
《内蒙古大学学报（自然科学版）》
CAS
CSCD
1996年第1期103-110,共8页
Journal of Inner Mongolia University：Natural Science Edition
基金
国家自然科学基金
中科院草原生态定位站开放站基金
关键词
退化草地
演替动态
封育恢复
草原
succession dynamics degenerated steppe of L. chinensis enclose(restoration)
