Time sequence and mode partition of high-standard prime farmland construction in Zhongjiang county, Sichuan province

Aimed at the construction requirements with concentration, fully supported facilities and friendly environment, taking Zhongjiang county as study area, a reasonable way in mapping out the time sequence and construction mode of high-standard prime farmland was investigated. And the time sequence and mode partition of high-standard prime farmland construction were determined by the technique for order preference by similarity to ideal solution (TOPSIS) and limiting factors analysis methods. Considering the natural endowments, infrastructure and construction conditions and economic and social affordability, 12 indexes were selected and analyzed. The results showed that high-standard prime farmland in Zhongjiang county could be divided to near-, mid- and long-term construction, and their area proportion of near, mid and long-term construction was 19.28%, 37.86% and 43.86%, respectively. Meanwhile, high-standard prime farmland in Zhongjiang county could be divided to three construction modes, namely slope modification construction mode, irrigation works construction mode and field roads construction mode, and their area proportion was 41.34%, 31.53% and 27.13%, respectively. This research provides a scientific basis for consolidation plan and construction programs of high-standard prime farmland in counties.