湖北省油菜主产区杂草群落的数量分析

Quantitative analysis of weed communities in main oilseed rape growing regions in Hubei Province

采用七级目测法定量调查了湖北省油菜主产区28个样点的杂草发生情况,应用主成分分析法对杂草群落进行了数量分析。结果表明,28个样点可以分为4个聚类群,即江汉平原鄂北旱茬油菜田、鄂东南旱茬油菜田、江汉平原稻茬油菜田和鄂东南稻茬油菜田。轮作制度与地理因素决定了湖北省油菜主产区杂草群落的分布。根据综合草害指数和发生频率明确了各聚类群相应的优势杂草,并就该地区油菜田杂草发生的特点提出了治理策略。

Comprehensive weed infestation indices of all weed populations from 28 sampling sites of main oilseed rape growing regions in Hubei Province were assessed with seven scales by visual assessment of weed dominance to crop, and the outputs of principal component analysis （PCA） based on the data above were ecologically interpreted. The results showed that 28 sampling groups were：fields rotated with dry field crops crops in Southeast of Hubei, fields rotated with sites of oilseed rape fields could be divided into 4 groups, and these in Jianghan plain and North of Hubei, fields rotated with dry field rice in Jianghan plain, fields rotated with rice in Southeast of Hubei. Crop rotation system and geographical factors determined the distribution of weed communities in main oilseed rape growing regions in Hubei Province. The dominant weeds of each group were determined by CII （comprehensive infestation index） values and frequency,and a weed management strategy was formulated based on weed infestation of each group.