Characteristics of Soil Organic Carbon (SOC) Loss with Water Erosion in Sloping Farmland of Southwestern China during Maize (Zea mays L.) Growth Stages

Due to frequent human disturbance and the influence of crop growth development, migration soil organic carbon (SOC) in sloping farmland is considerably different those other ecosystems. The impacts maize over its entire period on SOC loss purple soils under erosion stages were investigated, 2016. This was undertaken using rainfall simulation tests 15° slopes with a intensity 1.5 mm·min−1, Sichuan Province, China. In this study, fluctuating increasing trends surface runoff yield, interflow sediment dissolved (DOC) flux observed. Opposite observed DOC mass concentration, total (TOC) content sediment, particle state, enrichment ratio. rill stage 1.39–2.84, 3.22–7.78 times significantly higher than that sheet at each stage, respectively (p < 0.05). average concentration runoff, ratio increased by 100.58–146.44%, 44.44–126.15%, 141.32–191.26%, respectively, compared stage. Under experimental conditions, we found mainly occurred seedling mature for maize. We also could promote production interflow, leading intense occurring subsurface. Compared concentrations there an increase 4.90–28.29% indicating plays more important role loss. impact formation reducing caused erosion. study helps understand process agricultural areas.