Contribution to the Macrophytic Typology of Belgian Reference Watercourses

Figure 6

CCA ordination of the sites. Plots of the first, second, and third axes (% variance axis 1 = 18.2, axis 2 = 11.8, and axis 3 = 10.2). Only the variables having an R² ≥ 0.30 with the principal axes are plotted [19]. CONDU: conductivity, FR: conifer forest, FF: deciduous forest, ASIT: site altitude, ASP: spring altitude, SUBS: substrate, CAL: calcium, TAC: alkalinity, pH: pH, NO₃: nitrate nitrogen, PO₄: orthophosphates, and GEO 1, 3, 5, 6: geologies 1, 3, 5, 6.