Investigation on Weed Species and Community Structure in Machine-harvested Cotton Fields of Xinjiang Production and Construction Corps

ZHANG Qiang;LI Hong;ZHAO Bing-mei;DING Li-li;TIAN Ying;ZHU Yu-yong;WANG Lin;Agricultural Technology Extension Station of Xinjiang Production and Construction Corps;

inverted "W" nine-point sampling method;;Xinjiang Production and Construction Corps;;machine-harvested cotton field;;weeds;;investigation

The occurrence of weeds in the machine-harvested cotton fields in the 6~(th),12~(th) and 13~(th) divisions of Xinjiang Production and Construction Corps, was determined by surveying 99 plots and 891 quadrats of 11 farms using the inverted "W" nine-point sampling method. There were 46 weed species belonging to 44 genera of 20 families in northern and eastern Xinjiang, including 7 species of Gramineae(15.2%),38 species of broad-leaved weeds(82.6%),and one Cyperaceae(2.2%). Twenty eight were annual(60.9%) and 18 species were perennial weeds(39.1%). In general, Solanum nigrum L.,Chenopodium album L.,Convolvulus arvensis L. and Amaranthus retroflexus L. were the dominant weeds in machine-harvested cotton fields, and Hibiscus trionum L. was a regional dominant weed. Twelve species including Phragmites communis(Cav.) Trin. ex Steud.,Setaria viridis(L.) Beauv.,and Salsola collina Pall. were common weeds, and 29 species such as Sophora alopecuroides L.,Schoenoplectus planiculmis(F. Schmidt) Egorova, Sonchus oleraceus L. were general weeds. The species and community structure of weeds vary among regions and growth stages in machine-harvested cotton fields. These results are relevant for the comprehensive management of weeds in machine-harvested cotton fields.