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采用Pearson点相关系数(Pointcorrelationcoefficient)方法,研究无除草剂使用历史的稻茬油菜田和冬闲地中 草[Beckmanniasyzigachne(Stued.)Fernald]与其它杂草种群之间的联结关系。结果表明, 草有较强的喜湿性,与看麦娘(AlopecurusacquallisSobol.)、牛繁缕[Malachiumaquaticum(L.)Fries]和雀舌草(StellariaalsineGrimm.)等杂草种群相比,在不用除草剂与正常耕作条件下, 草适应性与竞争力弱,难以成为杂草群落的优势种;但在冬季休闲的稻茬田中,由于受积水的影响,其发生量急剧上升。这是近年来 草危害性加剧的原因之一。
The Pearson Point correlation coefficient (Pointcorrelationcoefficient) method was used to study the association between grass weeds and non-grass weeds in rapeseed field and winter fallow grassland [Beckmanniasyzigachne (Stued.) Fernald] without herbicide use history. The results showed that the grass had stronger hygroscopicity. Compared with other weed populations such as Alopecurus acquallis Sobol., Malachiumaquaticum (L.) Fries and Stellaria salsa Grimm. Under normal tillage conditions, grass adaptability and competitiveness were weak, which made it difficult to become the dominant species of weed community. However, in the winter cropping paddy field, its occurrence increased sharply due to the influence of water accumulation. This is one of the reasons why grass has become more dangerous in recent years.