稻田土壤杂草种子库研究

Seed Bank of Weeds in Paddy Fields

对江苏省仪征市连年稻麦两熟轮作稻田土壤杂草种子库中杂草种类进行了考查。结果表明 ,有 1 1科 2 2种杂草的种子主要分布在 0～ 1 0 cm土层内。同时 ,阐述了土壤种子库杂草种子的来源 ,因水分、湿度、光照等自然因素和耕作、人工除草等人为因素 ,杂草种子本身的完熟度等综合因素造成了土壤杂草种子库中杂草种子活力的损失与累积 ,以及杂草种子萌发与土层深度、水分等的关系 ,初步探明了水旱轮作对稻田土壤杂草种子库的影响 。

Seed bank of weeds in rice wheat rotation fields in Yizheng, Jiangsu Province was investigated. The result showed that there were 22 species of weeds, belonging to 11 families, which mainly distributed in 0-10 cm depth soil in the fields. The origin, loss and accumulation of weed seeds were discussed. Effects of soil depth, water content and lowland and upland crop rotation on the seed bank of weeds in the paddy fields were also observed. Strategies to decrease the seed occurrence of weed were given.