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上海绿叶菜田杂草发生为害特点及其对产量的影响
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摘要
分春夏和秋冬两个时期对上海市域9个区县绿叶菜田杂草发生为害现状进行了调查,共发现杂草67种,隶属24科54属,以禾本科和菊科杂草最多,一年生杂草占82.1%,多年生杂草占17.9%,本地种占80.6%,外来种占19.4%;出现频率较高的杂草有稗、马唐、牛筋草等禾本科杂草以及小藜、凹头苋、醴肠、繁缕、荠菜等阔叶类杂草。测定了优势杂草稗和繁缕对茼蒿和小白菜产量的影响,结果表明:当稗300株/m~2或繁缕250株/m~2时,茼蒿产量损失率分别可达48.7%和49.5%;当繁缕密度达到150株/m~2时,小白菜产量即开始受到明显影响,200—250株/m~2时小白菜产量损失率高达42.0%—48.1%。
        This study investigated the occurrence and damage status of weeds in green vegetable fields in nine counties of Shanghai.The investigations in spring/summer and autumn/winter found 67 weed species,belonging to 24 families and 54 genera,most of which are grassy and compositae weeds.Annual and perennial weeds are 82.1%and 17.9%respectively.Native weeds accounted for 80.6%,while 19.4%of alien species.Grassy weeds such as Echinochloa crusgalli,Digitaria sanguinalis,Eleusine indica and broadleaf weeds such as Chenopodium serotinum,Amaranthus lividus,Eclipta prostrata,Stellaria media,Capsella bursa-pastoris appeared more frequently in these weeds.Influence of Echinochloa crusgalli and Stellaria media on the yield of Chrysanthemum coronarium and Brassica campestris ssp.Chinensis var.communis was measured.The results showed that Chrysanthemum coronarium yield loss rate were up to 48.7%and 49.5%respectively when the growth density of Echinochloa crusgalli was 300/m or Stellaria media was 250/m.The yield of Brassica campestris ssp.Chinensis var.communis was effected obviously when the growth density of Stellaria media was 150/m~2,while the loss rate of Brassica campestris ssp.Chinensis var.communis was up to 42.0%—48.1%when the growth density of Stellaria media was 200/m~2—250/m~2.
引文
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