Study on the effects of different degradation types on plant diversity and interspecific relationship in alpine grassland:a case study in Lixian County
The structure of plant communities and interspecific relationships are the main indicators for assessing degradation in grasslands.Base on the evaluation of grassland health and degradation in Lixian County,Sichuan Province,the species diversity,interspecific association and niche breadth of the sampling plots in grasslands under different types of degradation were analyzed and investigated,and the interactions and interspecific relationships among species were discussed,which was helpful for the scientific restoration and rational utilization of these alpine grasslands.The results showed that there were 145 plant species belonging to 37 families and 106 genera in Lixian survey area,among which Deyeuxia scabrescens,Artemisia stechmanniana,and Poa annua were the top three dominant species.In toxicologically degraded grasslands,the niche overlap value of toxic grass and native species increased,which aggravated the competition between species and made the connection relationship closer than that of other degraded types.Conversely,in the degraded grassland of rocky desert type,the number of niche overlap of main species was the lowest,and many plant species were loosely connected.The AC alue of interspecific association was mainly negative,which was distinctly different from undegraded and toxicologically degraded grasslands.Therefore,different restoration measures should be adopted for two different types of degraded grasslands,and sustainable restoration should be realized according to local conditions and time.
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