Degradation and vegetation characteristics of Kobresia tibetica swamp meadow in the Sanjiangyuan area
[Objective]The Kobresia tibetica swampy meadow in the Sanjiangyuan region has undergone signifi-cant changes due to global climate change and human activities,resulting in a series of ecological and environmental is-sues.Exploring the degradation of K.tibetica meadows and changes in the vegetation characteristics is crucial for en-suring ecological security of the Sanjiangyuan region.[Method]infield surveys and data collection were conducted in Maqin County,Guoluo Prefecture,and Qumalai County,Yushu Prefecture,Qinghai Province,to investigate degrada-tion and vegetation characteristics of K.tibetica swampy meadows.[Result](1)K.tibetica was the dominant species across four different stages of degradation,but its quantitative traits(height,cover,and aboveground plant volume)significantly declined with increasing degradation.Average height decreased from 26.2 cm to 11.9 cm,cover dropped from 76%to 43%,and aboveground plant volume decreased from 1 061.6 g/m2 to 196.8 g/m2.(2)As degradation intensified,the proportion of K.tibetica grass within the plant community decreased.Plant volume contribution from Salicaceae and Gramineae were minimal under sever degradation,while other plant families contributed for a higher proportion.(3)The species richness index and diversity index showed that the most abundant species were in the middle degradation and light degradation;the evenness index ranked as heavyily>moderately>lightly>non-degraded.The dominance index showed no significant differences across the four different degradation stages.[Conclusion]Although K.tibetica retained its status as the dominant species across all degradation stages its com-petitive ability and the proportional share declined with increasing degradation.The degradation of K.tibetica mead-ows is characterized by reductions in average plant height,cover,and aboveground biomass,reflecting a broader de-cline in the community's dominant species.
Kobresia swamp meadowdegradationvegetation characteristicsSanjiangyuan area
NETL
NSTL
万方数据
