page_title: Lake of Fetzara
section_title: Principal component analysis
hierarchical_section_title: Lake of Fetzara / Soil quality / Results and discussion / Principal component analysis
caption_attribution_description: English: Principal component analysis of soil in the Fetzara region
context_page_description: The Lake of Fetzara is located in northeastern Algeria, 18 km southeast of the city of Annaba. It measures 17 km from east to west and 13 km from north to south, with an area of about 18,600 hectares. It was officially classified as an area "Ramsar", which involves protection of this location. Several studies have been conducted on water and soil of the region Fetzara [1-7]. These studies were carried out to monitor the salinity and to highlight its origins and factors governing it. The main objective of this study was to evaluate soil properties of Fetzara Lake that are affected by the phenomenon of salinization and to study their variation with depth. The samples were taken on the first two layers at eight points around the Fetzara Lake, for a total of 16 samples. The analytical results indicate that soil salinity has reached its maximum in the northeast and south of Lake with a dominance of sodium chloride-chemical facies.
context_section_description: The observation of the correlation circle formed by the two axes F1 and F2, we show that the factor F1 expresses 72.40% of the variance (Figure 5). On this axis, the soluble salts (Ca++, Mg++, Na+, Cl-, SO4—and EC) are opposed to HCO3-which represents the carbonate alkalinity. This is an axis which probably reflects at the same time the phenomenon of salinization affecting certain types of soils and an alkalinization that develop on other [10].
  The second axis F2, which represents 12.29% of the variance, opposes the soluble salts to the alkalinity, pH and K+. It may reflect the processes of salinization and alkalinization. But also the phenomenon of fixation of K+ by some clay minerals is not being ruled out. The distribution of individuals allows us to visualize three groups of associations; the first group G1 (S3, S4, S8, S11, S12 and S16) is characterized by mineralized solutions, it is opposed to the second group G2 (S6, S7, S14 and S15) representing the less mineralized solutions. The third group G3 (S1, S2, S9 and S10) includes the solutions loaded with bicarbonate.
caption: Principal component analysis of soil in the Fetzara region
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