After 2021, its spatial distribution showed a trend of agglomeration, which was mainly concentrated in the county cities in the Yangtze River Delta and the edge areas at the intersection of Guizhou, Hunan and Yunnan and was distributed in sheets.
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Study on the evolution of the spatial patterns and driving factors of national agricultural cultural heritage in China.
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The sentences
The X-axis and Y-axis of the standard deviation ellipse showed a decreasing trend annually, and the area of the ellipse decreased from 4,197,300 km2 in 2013 to 3,469,900 km2 in 2017, indicating that there was a national-level agricultural cultural heritage space.