The crop land change and spatial pattern in Loess Plateau over past 300 years

Based on the crop land raster data of the Loess Plateau over past 300 years,we utilized Exploratory Spatial Data Analysis(ESDA) to analyze the change of crop land area of counties in the Loess Plateau over 300 years.The results indicated that in the past three hundred years,the crop land area in Loess Plateau showed the tendency from increase to decrease,and then increase again.The global Moran's I indexes for crop land area per capita at county level of Loess Plateau reached the significant positive spatial correlation.The crop land area among counties on Loess Plateau took on evident spatial accumulative effect.The two types of clusters(High-High and Low-Low) among counties on Loess Plateau had a significant zonation,and it's variation rule showed dramatic spatial differentiation characteristics.