Effects of altitude gradient on grassland community composition and diversity in Liangheyuan Nature Reserve
[Objective]The effects of altitude gradient on grassland community composition and diver-sity were discussed in order to provide reasonable suggestions for grassland management and conservation.[Method]Margalef index,Simpson index,Shannon Wiener index and alatalo index are used to analyze the area with an altitude of 1 500～2 500 m in Liangheyuan Nature Reserve.[Result]There are 123 species of grasses in Liangheyuan Nature Reserve,belonging to 43 families and 101 genera.Agropyron cristatum,Ta-raxacum mongolicum and Geranium pratense are the dominant species in this area.With the change of alti-tude gradient,the quantity structure and characteristics of grassland are quite different.The altitude gradient is highly correlated with various diversity indices.Among them,Margalef index,Simpson index and Shan-non Wiener index all increase with altitude,but Alatalo index decreases with altitude.[Conclusion]With the increase of altitude gradient,the quantitative structure and characteristics of grassland communities fluc-tuate,and the change of altitude gradient has a great impact on the community diversity.Among them,Com-positae,Rubiaceae,Rosaceae and Shikonaceae should be the preferred species for ecological restoration and grassland reconstruction.
NETL
NSTL
万方数据
