| Effects of different rotation on farmland weed community in Dingxi |
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| DOI：10.7606/j.issn.1000-7601.2017.04.34 |
| Key Words: rotations farmland weed community species diversity |
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| Abstract: |
| To explore effects of different rotation on farmland weed community in Dingxi, a survey was conducted by the method of inverted W-sampling to determine species, quantity and aboveground biomass of weeds in different rotation fields.There were 15 weed species of 11 families in different rotation fields. According to the weed density and aboveground biomass, the predominant species were Sonchusoleraceus L. and Chenopodium album. The species diversity index rank in different rotation fields was potato-flax rotation, potato-wheat rotation, flax-wheat rotation, continuous flax, wheat-flax rotation, wheat-potato rotation, flax-potato rotationin sequence. The different weed community clustered four groups. Based on the density, aboveground biomass and summed dominance ratio of weed in different rotation field, the damage of weeds was greater in continuous flax field, wheat-flax rotation field, potato-flax rotation field, wheat-potato rotation field. The potato-wheat rotation, flax-wheat rotation and flax-potato rotation showed certain control ability in the type and quantity of weeds. |
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