Publications

He, TT; Zhang, MX; Xiao, W; Zhai, G; Fang, K; Chen, YW; Wu, CF (2025). Trend and potential enhancement of cropping intensity. COMPUTERS AND ELECTRONICS IN AGRICULTURE, 229, 109777.

Abstract
The sustained stability of the cropland replanting index is related to the national food security strategy. Therefore, it is important to obtain detailed process information on the spatial and temporal evolution of the replanting index with a long-time series and high accuracy. However, knowledge about the spatiotemporal dynamics of cropping intensity (CI) in China remains limited. This study used Landsat, MODIS data, and phenology algorithms to map the 30 m CI product in China (CCI30) and calculated the cropping intensity gap (CIP). From 2000 to 2020, the CI in China showed a trend of increasing and decreasing, ranging between 1.39 and 1.45, with the highest value appearing in 2009-2011. The regional CI increased from north to south and west to east, with the lowest CI of around 1.00 in the cold and middle temperate zones. The highest CI, around 1.65, occurred on the southeast coast and southwest of the country. After comparing the CI changes from 2000 to 2020, the conversion between single-cropping and double-cropping was 197,421.53 km2 and 207,761.61 km2, respectively, mainly in the warm temperate and middle subtropical zones. CIP totaled 505,038 km2, concentrated in the mountains of southwest China. The study mapped valuable spatial and temporal information of high-precision long-time series CI, providing data references for governments to strengthen cropland management.

DOI:
10.1016/j.compag.2024.109777

ISSN:
0168-1699