定西地区不同轮作田杂草生态位研究

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。

Weeds Ecological Niche of Different Rotation Fields in Dingxi

To explore weed species niche of different rotation field in Dingxi, Weed survey was conducted by the method of inverted W-sampling to investigate seedling stage weeds in different rotation field.The research studied the niche breadth and niche overlap of the main weeds species by Levins niche breadth index and Schoener niche overlap index , effects of different rotation on farmland weed niche. The results showed that, Sonchusoleraceus L. and Chenopodium album had larger niche breadth than other species, in absolute advantage position in the community, to harm of farmland is serious. The result will provide the scientific basis for weed control and reasonable rotation sequences.