QUANTITATIVE ANALYSIS ON NUTRIENT OF WATERS IN THE THREE GORGES DEMONSTRATION SETTLEMENT AND ITS CONTIGUOUS REGIONS

In this research, taking the factors as pH value, total nitrogen(N), total phosphor(P), PO33--P and P2O5-P, cluster analysi s(CA) and principal component analysis(PCA) of 10 important waters in Meiziya Vi llage and its contiguous regions were carriedon CA showed that the ten waters co uld be classified into two categories, and one of which could be classified into two categories, too. PCA showed that P contributed to the first principal compo nent most and N contributed the second principal component largely The factor sc ore coefficient of N being negative meant there existed negative relationship, a nd it could affect the arrange direction of water samplings in the second princi pal component.