宁夏中部干旱带草地20年生产力和承载力变化研究

Changes of Productivity and Grazing Capacity of Grassland in Middle Arid Zone of Ningxia during 20 Years

[目的]探讨宁夏中部干旱带草地植被逆行演替规律。[方法]以1982~2001年的调查资料为基础,对7个调查样点的草地型、植被特征、草地生产力及草地质量进行分析。[结果]宁夏中部干旱带的草地型在近20年的时间里已经发生或正在发生变化,群落内优势种也正在被其他种所代替,植被覆盖度和群落内植物种数在持续下降,草地承载力平均下降了114%,草地质量严重下降。[结论]该研究为典型草原可持续利用提供了基础数据。

[Objective] The study aimed to explore the vegetation regressive succession law of the middle arid zone of Ningxia.[Method] Based on the investigation data of seven plots in this region from 1982 to 2001,grassland type, vegetation characteristics,productivity and grassland quality were analyzed.[Result] During nearly 20 years,the grassland type of Middle Arid Zone of Ningxia had been changing;the dominant species were being replaced by other species;the vegetation coverage and the number of species in Conmunity teduced persistently; the grazing capacity decreased by 114% and the grassland quality deteriorated seriously. [Conclusion] This study should provide basic data for the sustainable utilization of typical grassland.