Fig. 2: Changes in rice area from 2000 to 2020.

a The rice area of Sanjiang Plain from 2000 to 2020. The dashed line is the trend of rice area changes. b, c The marginal line graphs show the mean slope of rice area changes along with longitude and latitude based on a 5 × 5 km fishnet. d The slope of the rice area changes based on a 5 × 5 km fishnet.