天祝高寒草甸高原鼢鼠鼠丘植被演替调查

摘要

The vegetation succession on zokor mounds is an important factor showing the rangeland recov-ers.The succession of vegetation on zokor mounds at different stages in alpine meadow in Tianzhu was investi-gated.The results showed that there was significant difference in vegetation physiognomy and composition be-tween the vegetation on zokor mounds and in adjacent area.With the development of vegetation succession,the proportion of annual and biennial plants,and perennial plants in vegetation community on zokor mounds in-creased.The plants of grass family and sedge family also increased,but the proportion of grasses was lower than that in adjacent area.The result of α diversity index revealed that the richness of plants on zokor mounds in-creased with the succession development,but the richness was lower than that in adjacent area.The result of the Shamon-wiener index showed that the vegetation community and the plant composition on the zokor mounds were close to the adjacent area within 4 years.The biomass of annual and biennial plants on zokor mounds at the each succession stage was higher than that in adjacent area.%高原鼢鼠鼠丘植被演替是反映草地恢复的重要指标之一。以定点标记的方法对天祝高寒草甸高原鼢鼠鼠丘植被演替进行了调查。结果表明,鼠丘植被在不同演替阶段外貌特征及植物组成差异较大。随演替的进行,1~2年生植物和多年生杂类草比例呈递增趋势,禾本科和莎草科植物也伴随出现,但在群落中所占比例相对较低。α多样性表明,鼠丘植物的丰富度指数随演替进行呈显著递增趋势,但都低于原生植被。Shamon-wiener 指数表明,形成4年的鼠丘植被群落达到演替后期,物种组成接近原生植被。植物功能群组成显示,演替各阶段1~2年生植物生物量在各自群落中的比例显著高于原生植被。