油菜田杂草发生特点与田间土壤水分的关系研究

Relationship between the Weed and Soil Moisture in Rape Field

运用倒置“W”9点取样法对湖北省涝渍地开发工程技术研究中心高场示范区油菜田杂草进行了调查。结果表明 ,该地区油菜田杂草的发生特点与耕作层土壤水分含量存在明显关系 :对产量危害较大的禾本科杂草在重渍害区为优势种群 ,其相对多度随着土壤水分的增加而增高 ;稻槎菜在本地区所有油菜田均为优势种群 ,以轻渍害区发生最为严重 ;牛繁缕在本地油菜田为中等发生 ,以轻渍害区发生稍重 ;荠菜、泥胡菜等杂草在土壤水分含量较低的田块的相对多度较大。改良区杂草种类最多 ,但总重量最低 ;

Survey of rape field weed was conducted by using an inverted W pattern with 9 sampling points in Gaochang experimental farm of Hubei Provincial Engineering Exploitation and Technological Research Center for Waterlogged and Watery Cropland. The results showed that relationship between the weed and the soil moisture in cultivated horizon was obvious. The monocots whose relative abundance increased with the soil moisture are the most abundant in the seriously waterlogged area. Lapsana apogonides was very abundant in all survey field, especially in lightly waterlogged land; Stellaria media was comparatively abundant in lightly waterlogged land. Gapsella bursa-pastoris and Hemistepta Lyrata were abundant in the fields where the moisture was comparatively low. The total weight of weeds was the highest in lightly waterlogged land and the lowest in ameliorated land. There were more species of weeds in ameliorated land than others.