Survey on species composition of weed community at wheat-rape rotation fields in conservation tillage system of Qinghai province
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DOI：10.7606/j.issn.1000-7601.2011.02.17
Key Words: wheat-rape rotation  conservation tillage  weed community  species composition  relative abundance
Author NameAffiliation
WEI Youhai Research and Development Center of Biorational Pesticide，Northwest A & F University， Yangling， Shaanxi 712100，China
Institute of Plant Protection， Qinghai Academy of Agriculture and Forestry， Xining， Qinghai 810016，China 
GUO Qingyun Institute of Plant Protection， Qinghai Academy of Agriculture and Forestry， Xining， Qinghai 810016，China 
FENG Juntao Research and Development Center of Biorational Pesticide，Northwest A & F University， Yangling， Shaanxi 712100，China 
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Abstract:
      Weed survey was conducted by sampling methods of inverted W-pattern to determine the species composi-tion and structure of weed communities in wheat-rape rotation fields in conservation tillage system. The results showed that among 55 weed species belonging to 22 families, 4 species were considered as dominant weeds, including Elsholtzia densa Benth，Chenopodium album，Polygonum convolvlus L and thlaspi arvense Linn.; 9 species were regqional domi-nant weeds; 8 common weed species and 34 normal weed species. The overall abundance of Avena fatua Linn( Elsholtzia densa Benth)，Sonchus arvensis Linn. And Chenopodium album were relatively high and were the main components of weed communities at the wheat-rape rotation fields in conservation tillage system.
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