论文部分内容阅读
本文阐述了近１０年来青海麦田杂草演替趋势，麦田杂草种类变化不大，严重危害的杂草野燕麦、密花香蕾、篇蓄、藜等发生危害下降，其危害指数减少依次是：１５．０３、８，０２、９．５１、７．４２，多年生和难治杂草田旋花、苣荬菜、大刺儿菜、猪殃殃等发生危害加重，危害指数依次增加１．８８、１．５３、１．８７、１．６１。以野燕麦和对２．４－Ｄ敏感的阔叶杂草群落发生危害明显下降；以田旋花、苣荬菜、大刺儿菜等多年生杂草群落发生危害加重。文中分析了杂草演替原因，提出了对策意见。
This paper describes the succession of weeds in the past 10 years in Qinghai wheat field weed species did not change much, severely endangered weed wild oat, sweet-scented lentil buds, Pianbu, pigweed and other hazards occurred to reduce the hazard index were: 15.03,8,02,9.51,7.42, perennial and refractory weed fields Convolvulaceae, Cichorium, Sarcandra glabra, Galium aparine and other hazards increased, the hazard index increased by 1.88 , 1.53, 1.87, 1.61. Occurrence of wild oats and 2.4-D-sensitive broad-leaved weed communities decreased significantly; to Convolvulaceae, Chicory, Larvae and other perennial weeds community hazards worse. In this paper, we analyze the reasons for the succession of weeds and put forward countermeasures.