关键词: 风沙灾害, 风沙灾害, 棉花, 光合特性, 日变化

Abstract: Weeds seriously affect the yield and quality of rapeseed, in order to reduce the harm of weeds in rice field, this paper three introduced three aspects of weed seed bank, weed species and weed occurrence characteristics of rice rapeseed field in Hunan province and the physical, chemical, biological and other farming measures currently adopted, and the future of the comprehensive management of weeds in rape fields were discussed and prospected. The results show that the weed seed bank density of up to 224 550 seed / m2, and three harvests weeds in rape fields mainly Alopecurus aequalis, Alopecurus japonicus, Beckmannia syzigachne, Sclerochloa dura, Poa annaua and other wet weeds, chemically-based control methods, less the rest of the measures applied. At present, the control method is mainly used in chemical method, and the rest of the measures are used less, and the environment pollution is serious. Therefore, it is the best choice to actively promote the comprehensive friendly governance system to control weed in Rice-Rice-Rape cropping system field in Hunan province.