Temporal miche and dynamics of main weed species in turf-weed community in golf courses

The composition, dynamics and niche of main weeds in turf-weed community in 2 golf courses under subtropics during 2002/3-2003/3 were studied. Results showed that 59 weeds were determined which included 14 grasses species ,4 sedge species and 41 broad leaved species in turf-weed community in golf courses. Weed species which appeared Over 20% in plots of golf courses were Cyperus rotundus,Kyllinga brevifolia,Oxalis dellenii,Panicum repens,Eleusina indica,Paspalum conjugtum,Digitaria sanguinalis,Hydrocotyle sibthorpioides,Setaria viridis,Alternantherta philoxeroides,Portulaca oleracea,Kummerowia striata and Viola japonica; Annual growth trend of the 13 main weed species was number declined during 1～3 months and growing quickly during April and October,but the dynamics was undulating,the number declining after October;Niches breadth of over 70% weed species in turf-weedncommunity of golf courses was about 0.7, the higher niches breadth among 13 weed species was Cyperus rotundus(0.9054), Kyllinga brevifolia, (0.8618)and Oxalis dellenii(0.8381),the lowest niches breadth among 13 weed species was Portulaca oleracea(0.3922); The highest niches overlap between Alternantherta philoxeroides and Portulaca oleracea(0.7598)in 13 weed species, the lowest niches overlap between Hydrocotyle sibthorpioides and Kummerowia striata (0.1666).