Seasonal Variations and Cluster Analysis of the Turf Weed Communities in Shenzhen, China

The species composition and seasonal variations of the turf weed communities were investigated in Shenzhen with line intercept method,and all the data obtained were analyzed with cluster analysis.Totally 83 species belonging to 25 families were found,of which 67,68,70 and 49 species were observed in spring,summer,autumn and winter,respectively.The species occurred in all the four seasons counted for 48.2% of the total species.Cyperus rotundus,Kylling abrevitolia var.leiolepis,Cynodon dactylon and Euphorbia thymifolia were dominant and the most dangerous weed species.The turf weeds were classified into 15 communities,of which 3 communities observed in spring while 4 communities investigated in each of the other three seasons.Management level is the most important factor affecting the weed communities’ structure.