保护性耕作制度下青海麦油轮作田间杂草群落组成调查

Survey on species composition of weed community at wheat-rape rotation fields in conservation tillage system of Qinghai province

采用倒置"W"取样法对青海麦油轮作区保护性耕作田间杂草进行了调查,以明确田间杂草的种类组成及群落结构。结果表明,青海省保护性耕作田杂草有55种,隶属于22科,其中优势杂草有密花香薷(Elsholtziadensa Benth)、藜(Chenopodium album)、荞麦蔓(Polygonum convolvlus L.)、遏蓝菜(Thlaspi arvenseLinn.)等4种,区域性优势杂草有9种,常见杂草有8种,一般杂草有34种。发生优势度较大的杂草为野燕麦(Avena fatua Linn)、密花香薷(Elsholtzia densaBenth)、苣荬菜(Sonchus arvensis Linn.)、藜(Chenopodium album)等,是构成保护性耕作制度下麦油轮作田间杂草群落的优势种。

Weed survey was conducted by sampling methods of inverted W-pattern to determine the species composition 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 regional dominant 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.