厢作平作下不同生态种养对杂草群落及物种多样性的.

[Objective] The present paper aimed to explore the variation trend of weed community in paddy fields and the effect of grass control. [ Method] The weed communities and control effects of flat-cropping fish, flat-cropping ducks, flat-cropping rice, chamber-cropping fish, chamber-cropping ducks and chamber-cropping rice were investigated. [Result] There was a big difference in weed species between chamber farming and flat planting, flat cropping was mainly harmed by monocotyledonous weeds, annual weeds, and mid-late weeds, while chamber cropping was mainly harmed by annual weeds, monocotyledonous weeds and early weeds; The weed control effect of flat cropping was better than that of chamber cropping, the density control effects of flat-cropping ducks and fish were 90. 28% and 98. 61 %, and the chamber cropping of ducks and fish were 88. 00% and 67. 00%. The results also showed that the Simpon index,Shannon-Wiener index, Pielou index and species richness of chamber-cropping were higher than that of flat cropping; The Simpon index, Shannon Wiener index, Pielou index and species richness of duck farming in flat-cropping fish were higher than that in flat-cropping ducks; In early stage, Simpon index, Shannon Wiener index, Pielou evenness index and species richness of chamber-cropping ducks were higher than that in chamber-cropping fish, and in later stage were opposite. [ Conclusion] The raising farming and fish farming significantly changed the community structure and composition of weeds in paddy fields. The effect of duck farming on weeds was higher than that of fish farming in chamber cropping, and the effect of fish farming on weeds was higher than that of ducks farming in flat cropping. However, fish and duck farming in rice fields had an imponant effect on weeds and played an imponant role in controlling weeds. [ABSTRACT FROM AUTHOR]