Preliminary study on soil seed bank of weeds in winter wheat field on Loess Plateau

Soil seed bank of weeds is the main resource of weeds in crop field. In order to explore the influence of microclimate and cultivation on seed bank of weeds, the study was conducted in Qingyang City and Tianshui City. The results showed that there were 20 species of weeds (belonging to 9 families) in Qingyang. The total number of weeds was 2 520 plants/m2 and 1 964 plants/m2 in the center and edge of field respectively, and the main weeds were Echinochloa crusgalli, which accounted for 47.54% and 30.50% of the total respectively. There were 13 species of weeds (belonging 10 families) in Tianshui. The total number of weeds was 3 873 plants/m2 and 3 506 plants/m2 in the center and edge of field respectively, and the main weeds were Herba cephalanoploris and Arenaria serpyllifolia, which accounted for 34.68% and 28.27% of the total in field center, and 32.29% and 32.63% of the total in field edge. The number of weeds in field edge was higher than that in field center. E. crusgalli, H. cephalanoploris and A. serpyllifolia were the dominant species in winter wheat field. In addition, the strategies for weed control were provided based on the research results.