种植不同冷季型草对稻田冬闲田杂草群落的影响

Effect of Planting Different Cool-season Grasses on Weed Community in Fallow Paddy Field

选择长沙、宁乡、湘阴三个地区的双季稻田,从2012年至2013年,以冬闲田为对照,冬季种植黑麦草、燕麦、紫云英、白三叶和油菜,研究不同冷季型草对冬闲田杂草群落结构的影响。结果表明,与冬闲相比,种植不同冷季型草后杂草群落均有所减少,其中种植黑麦草小区杂草种类与数量最少,宁乡试验点减少3个种类共552株,长沙试验点减少6个种类共718株,湘阴试验点减少7个种类共452株。种植不同冷季型草对防控稻田冬闲田的杂草均有一定效果,而以种植黑麦草效果最佳。而种植燕麦后杂草群落数量分布较均匀,最有利于保护杂草多样性。

The effects of planting different cool - season grass species including ryegrass,oat,milk vetches,white clover and oilseed rape on the structure of weed community in winter - fallow paddy field were investigated in typical double - cropping paddy fields in Changsha, Ningxiang and Xiangyin from 2012 to 2013. The results showed that weed communities in all the experimental sites were decreased after the planting of different cool - season grass species,as compared with the winter -fallow paddy field. The least weed species and lowest weed number was in the sites of planting ryegrass. The weed communities were decreased by 3 species with 552 plants in Ningxiang, and decreased by 6 species with 718 plants in Changsha site,and decreased by 7 species with 452 plants in Xiangyin. In general,planting different cool - season grasses,especially ryegrass can effectively protect and control the weeds in winter - fallow paddy field. While planting oat can significantly balance the number and distribution of weed communities, which is beneficial to protect weed diversity.