Abstract: Based on the land use image and grain yield data of the Chinese Academy of Sciences with a resolution of 30 m, and with the help of landscape ecology methods and spatial statistical analysis methods, this paper explored the correlation between the landscape fragmentation effect of paddy fields and dry lands and the change of grain yield in Qianjiang City at the landscape level and township scale. The results showed that the grain output of the study area was basically stable from 2010 to 2018; the internal structure of cultivated land in the towns and townships in the southeast was basically stable, while the remaining towns and townships were showing an increasing trend of change, and most of these towns and townships had changed from increase to decrease after 2010; the fragmentation effect of paddy field landscape was greatly affected by the number of patches, while that of dry land landscape was greatly affected by the shape and internal structure of patches. In order to ensure the balance of regional grain output, the shape of dryland landscape in the region should be improved, control the fragmentation of internal structure should be controlled, so as to ensure the safety of regional grain production.

Key words: landscape fragmentation, grain yield, spatial and temporal pattern, spatial data