作　　者： (牛小霞）; (牛俊义）;

机构地区： 甘肃省农业工程技术研究院,甘肃武威733006

出　　处： 《中国农学通报》 2017年第24期148-153,共6页

摘　　要： 为明确定西地区不同轮作田杂草生态位,采用倒置"W"九点取样法,对定西地区不同轮作田苗期杂草进行了调查。利用Levins生态位宽度指数和Schoener重叠指数对定西地区不同轮作田主要杂草生态位进行分析,了解不同轮作对农田杂草生态位的影响。研究表明:苦苣菜、藜的生态位宽度最大,在群落中处于绝对的优势地位,对农田危害严重。研究结果可以为农田杂草防治和建立合理的轮作顺序提供依据。 To explore weeds ecological niche of different rotation fields in Dingxi, weed survey was conductedby the method of inverted W-sampling. The weeds ecological niche was analyzed by Levins niche breadthindex and Schoener niche overlap index, the effect of different rotations on farmland weeds niche was studied.The results showed that Sonchusoleraceus L. and Chenopodium album L. had larger niche breadth, which werein absolute advantage position in the community and its harm to farmland was serious. The result could providescientific basis for weed control and reasonable rotation sequences.

关 键 词： 轮作 杂草 生态位