从植被演替和抗风性研究包兰线沙坡头段人工植被稳定性

运用群落演替与风沙流因子分析相结合的方法论证了群落的稳定性。在沙坡头地区,以油蒿为主的人工群落在长期的自然演替过程中已达到与生境条件相互适应的动态稳定过程。通过沙坡头与周边地区植被演替的比较研究,表明了该地区现有植被正形成(或已形成)偏途顶极序列,该植被在相当长的时间内会稳定存在,这些演替可促使沙坡头地区的人工植被向更为稳定的人工+自然复合生态系统以及自然生态系统方向变化。此外,风洞实验结果显示,沙坡头现有主要植被和地表能够抵抗较大风沙流胁迫,已形成了能够忍耐沙尘暴的生态系统。

Exploring the stability of artificial vegetation at Shapotou section along Baotou-Lanzhou railway:proceeded from succession and wind-resistence capacity of vegetation

Based on community succession and analysis of sand flow,the stability of com munity was studied.In Shapoptou area,the artificial communities in which Artemisia ordosica communi ty is dominant are adaptable to the habitat environment in long-term natural succession and they are stable.The results of observation and comparative study of vegetation succession in Shapotou and the vicinity showed that existing vegetation communities are evolving towards disclimax and in the future long periods of time Artemisia ordosica community will be stable.These succes-sions can facilitate the evolution of the local artificial vegetation towards more stable artificial natural compound ecosystem and even natural ecosystem.Furthermore,the research result of im-pact of wind flow on plant and earth-surface wind-tunnel experiment result showed that main vegetation and earth-surface of Shapotou at present can resist greater stress from wind flow and the ecosystem that can stand sand-dust storms has been formed.