宁夏荒漠草原恢复演替过程中物种多样性与生产力的变化

Changes of the species diversity and productivity of desert steppe in restoration succession in Ningxia

荒漠草原一直是生态学者关注的焦点。文章以宁夏灵武的荒漠草原区为研究对象,对围栏条件下退化群落的物种多样性、生产力和群落演替及其生态机制进行探讨,为荒漠草原的植被恢复和重建提供理论基础。结果表明:群落生产力除受物种多样性的影响外,也受物种本身特征和环境资源的影响。在荒漠草原中功能群盖度与群落初级生产力无显著的相关关系。荒漠植物群落物种多样性指数在时间尺度上的变化表现为随着围栏时间的延续逐渐增加,而生态优势度变化趋势则相反。在不同年份年降水量直接影响植物群落物种数的多少、丰富度和生产力。

Steppe desert community in Ningxia had been researched on the following items： species diversity,palatable forage productivity and the succession under enclosure. The results show that the community productivity was affected not only by species diversity,but also by the characters of species and environmental resources. No significant correlation was found between the coverage per functional group and primary productivity of community. The species diversity index of the steppe desert community increased with the extended time with enclosure; but the trend of the ecological dominance was opposite. The number of species,abundance and productivity of plant community were affected by precipitation per year.