Effects of Different Planting Patterns on Weeds Community

To ascertain the technology of land comprehensive reclamation based on ecological conservation in midland moutain area along the Yangtze river in China,by using quadrate sampling method the authors conducted the field surveys of species diversity of weed community in different farmland located in Pufeng Village.Results:1)The weeds community structure varied in different planting modes of farmlands.There were nine weed species belonging to nine genera and five families in soybean sample field;4families,eight weed species belonging to eight genera and four families in vegetable sample field, eight weed species belonging to eight genera and seven families in cotton sample field and five weed species belonging to four genera and four families in paddy sample field.2)The species richness of weed community varied with different planting mode.There were nine weed species in soybean field,eight weed species in vegetable field,eight weed species in cotton field and five weed species in paddy field.3)The compositions of weed community in farmland were dominated by Gramineae, Amaranthaceae and Cyperaceae.The amount of Gramineae weeds and Amaranthaceae weeds accounted for more than 80% of quantity of all weeds in soybean field.Conclusion:Weeds community structure in different planting method were greatly discrepant,and the diversities of weed community were determined by planting method.