As general ground dwelling predators of many agricultural pests

Carabid beetle community responds to the environmental disturbance and climate warming

and thus is intensively related with occurrence of arthropod pests. With changes of climate and land use

the community of ground beetles in the black soil cropping area of the Sanjiang Plain is bound to be affected. In this study

a total of 1 527 carabid beetle adult individuals belonging to 36 species were collected from18 sampling sites located in poplar woodlands and corn fields at different latitude. Pitfall trapping was used to investigate the species richness and individual abundance of Carabid family. The diversity index of ground beetles was also calculated. The effects of latitude difference and land types on these indicators were studied. Relationship of abundance between ground beetle species and other related arthropod groups was also analyzed. Among the samples

Dolichus halensis

Dolichus halensis

and

Pterostichus gebleri

were found to be the dominant species in this area. Correlation analysis between the species richness and individuals of ground beetles indicated that species richness and individuals of ground beetles were significantly positive correlated. Under different latitudes and land use types

there were significant differences in the number of individual for specific carabid beetle species: the number of individuals in the three latitudes was Changchun

<

Harbin

<

Suihua; individual number in the corn fields is higher than that from poplars woodland. However

differences of ground beetle species richness at different latitudes and land use types were not significant. Analysis of the correlation between various ground beetles individuals showed that:

Dolichus halensis

Pterostichus gebleri

and

Synuchus congruous

had a significantly positive correlation; and these species had a significant correlation with

Orthoptera

. Analysis of variance for the most abundant 7 species ground beetles showed that the number of

Harpalus pallidipennis

in different land types was significantly different;

Dolichus halensis

varied significantly at different latitudes and land types

Synuchus congruous

is significantly different in these two land types

the total number of ground beetles is significantly different at different latitudes and different land types. There was no significant interaction between latitudes and land use types. Overall

the activity-density of carabid beetles at lower latitude was less than that at higher latitudes

and the number of ground beetles in corn fields is bigger than that in woodland. As the climate warming

the number of ground beetles will decrease; and as the type of land use changing from woodland to farmland

the number of ground beetles will increase. Moreover

these big body size carabid beetle species (

Dolichus halensis

Pterostichus gebleri

and

Synuchus congruous

) might have some overlap in prey spectrum.