【摘要】 为了解大通河上游夏季牧场基于饮水点放牧半径范围的高寒植被演替过程,在祁连县默勒镇瓦日尕村夏季草场采用扣笼法进行调查。结果表明:随着饮水半径的缩小,草地植物由34种下降到25种,植物多样性显著下降(P<0.05);草地优势种植物的株高、盖度、植物量、优势度均显著下降(P<0.05);美丽风毛菊等阔叶杂类草的盖度、植物量、优势度均显著增加(P<0.05);草地优良牧草比例显著下降(P<0.05),杂类草比例逐渐增高。因此,草地植物种类、植被特征和群落组成均有一定变化,草地出现明显的退化趋势。更多还原

【Abstract】 In order to understand the vegetation succession characteristics of summer pastures at the upper reaches of Datong River,an investigation was carried out based on grazing radius in Wariga village,Mule town,Qilian county by caging method. The results that the number of plant species decreased from 34 to 25 with the decrease of grazing radius. The plant diversity of grassland decreased significantly(P<0.05);The plant height,coverage,above ground biomass and dominance of dominant species decreased significantly(P<0.05). The coverage,plant quantity and dominance of broad-leaved forbs such as Saussurea pulchra increased significantly(P<0.05). The ratio of forages decreased significantly(P<0.05). The ratio of forbs gradually increased. Grazing near drinking water point resulted significant change in the species of the grassland,the characteristics of the vegetation and the composition of the community,presenting obvious degradation tendency.更多还原