COMPARISON BETWEEN POLAR ORDINATION AND DCA ORDINATION

Polar ordination and DCA(Detrended Correspondence Analysis)ordination were representative methods of community ordination in different period.Based on the case of Changting,two methods had similar results,but difference remained at the same time.The outcome of Polar ordination was better than of DCA ordination on axis 1,but worse than DCA ordination on axis 2.The result of Polar ordination was affected by both X axes and Y axes,but the DCA ordination affected by the axis 1 mainly.To express the ecological signification of axis,Polar ordination was more direct than DCA ordination.