青藏高原"黑土滩"退化草地植被演替规律的研究

研究了青藏高原“黑土滩“退化过程中植被组成、群落综合特征的变化规律,探讨了退化演替的物种替代机制及恢复演替模式.结果表明,在退化演替过程中群落主要种的优势地位发生明显的替代变化.植被覆盖度、地上生物量、优良牧草产量比例随草地退化程度的加剧而明显下降.随着退化程度的加重,草地植物根系逐渐减少,草土比的比值明显减少,比值由轻度退化类型的1:5左右演变到极度退化类型的1:400左右.分析提出了“黑土滩“的形成机制、生态过程及恢复对策.

Research or Regulation of Vegetation Succession in Degraded Grassland in Qinghai and Tibetan plateau

Research did on the form of vegetation,combination characteristic of plants community in the grassland-degraded procession,probe into the mechanism of succession of vegetation and model of succession of rehabilitation.Result show that superiority condition of main vegetation community has great changes,covering rate of vegetation,biomass above ground,rate of prodectivity of superiority grass declined obviously in the degraded procession.The roots of grassland plants become less and less along with the grassland degraded.The percentage of grass and soil decreased obviously.Percentage from 1:5 of slight degraded become into 1:400 of medium degraded style.The mechanism of degraded grassland and biology procession were analysis,the countermeasures of rehabilitation are raised.