Insect Community Characteristics of Five Common Crop Fields in Dry-hot Valley Area of Lujiangba

PurposeTo clarify the insect community characteristics of common crops in dry-hot valley of Lujiangba region.

MethodsFrom March to November 2020, the insect community of five common crops in Lujiangba region were investigated by visual observation, sweeping and trapping methods.

ResultsA total of 6307 insects belonging to 12 orders, 64 families and 113 species were captured. The number of insect species was the highest in mango field while the lowest in cucumber field. The number of individuals was the highest in mango field and the lowest in bean field. Diversity analysis showed that: the Margalef index and Shannon-Wiener index of insect community were mango field>jujube field>bean field>tomato field>cucumber field, and Simpson index and Pielou index of insect community were mango field>jujube field>cucumber field>tomato field>bean field. The characteristics of pest subcommunity were similar to those of the whole insect community. To natural enemy subcommunity, the Margalef index was higher in mango field and jujube field than in the other three crop field, while the Shannon-Wiener index, Pielou index and Simpson index were higher in cucumber field, tomato field and bean field than in the other two crop fields. The stability analysis showed that: the S_a/S_b value was mango field>jujube field>tomato field>bean field>cucumber field, the d_s/d_m value was bean field>tomato field>cucumber field>mango field>jujube field. The insect community similarity analysis showed that the similarity coefficients in five common crops was moderate or extreme dissimilarity.

ConclusionMango field and jujube field are rich in vegetation types and less human disturbance, the insect community has abundant insect species, higher diversity and better stability.