Comparing of the diversity of grasshopper community in grassland in Jianping County of Liaoning Province based on two sampling methods

The grasshoppers were collected from 12 sampling plots of four typical grassland types （warm steppe grassland， mountain meadow， warm meadow grassland， and warm shrub grassland） in Jianping County by using the sweep sampling method and the sample frame sampling methods. On this basis， the list of grassland grasshoppers in Jianping County was compiled， and the diversity of grasshopper communities was analyzed. Meanwhile， the differences in grasshopper community diversity between different grassland types and under two sampling methods were compared. The results found that： a total of 1688 grasshoppers belonging to 5 families and 10 species were collected in 12 sampling plots. The dominance populations of grasshoppers in Jianping County were Chorthippus brunneus huabeiensis （24.82%）， Euchorthippus unicolor （24.47%）， Oedaleus infernalis （22.69%） and Calliptamus abbreviatus （19.49%）. Among four types of grasslands， the mountain meadow exhibited the highest species diversity and abundance of grasshopper community. At the same time， the Shannon-Wiener index and Margalef index were also the highest， while the Pielou index was the lowest. On the other hand， the warm temperate grassland had a relatively lower species number， with correspondingly lower values for both Shannon-Wiener index and Margalef index. Additionally， the Berger-Parker index was higher in this case. Furthermore， warm meadow grassland showed a lower presence in grasshopper number compared to other types of grasslands， but displayed a higher Pielou index. The results obtained from grasshopper communities diversity analysis by using sweep sampling method indicated that samples collected from mountain meadows had higher number of species， abundance and Shannon-Wiener index compared to those collected at warm temperate grassland. These findings were consistent with previous analyses conducted on different types of grasslands. However， the results based on the sample frame sampling method indicated that stability in diversity indices among similar types of grasslands could not accurately reflect differences between various types of grasslands. Comparison of the grasshopper community diversity based on two different sampling methods revealed that the sweep sampling method yielded a greater number of species， quantity and Shannon-Wiener index than the sample frame sampling method. Meanwhile， both methods exhibited significant differences across all indices except for the Berger-Parke index. Compared with the sample frame sampling method， the sweep sampling method was more effective in investigating the diversity of grasshopper communities in Jianping Ccounty.