It is unequivocally recognized that the algal flora in the soil, along with other groups of living organisms, is a component part of the process of aggregation-structuration of the soil mass. At the same time, however, its role is reduced only to the direct participation of algae in the sequestration-stabilization of organic carbon in structural aggregates. In our more recent research (Jigău and co-authors, 2019 a, b, 2021) the role of cyanophyte algae in the sequestration-stabilization of organic carbon in soil is examined through the concept of the priority role of algae in the functioning of the soil microbiome. In the opinion of the cited authors, carbon sequestration-stabilization is the product of a complex of processes that are performed with the direct and indirect participation of nitrogen-fixing cyanophyte algae and involves several hierarchical structural-functional levels of integration of biotic and abiotic matter in the solification process. The lower level involves the formation of bacterial-algal cenoses that are characterized by a single algal-bacterial trophic level. The successive hierarchical level includes all the processes of intimate mixing of mineral colloids (‹0.2 μ) and living matter (billions of microorganisms) and is characterized by three trophic levels (consumer, sequestrational-consumer, sequestrational-resource-reproductive) and the formation of biopedoplasm / pedostructural matter. Within it, interacted and interdetermined processes of transformation of mineral and living matter are carried out (Zubcova, Karpacevschi, 2001). The evolution of pedostructural matter is determined by the continuous passage of microbiotic living matter into the pedoplasm, after death, and the permanent formation of new masses of living matter based on mineral elements and energy resulting from the decomposition of minerals and organic matter gaining living matter attributes. The subsequent evolution of the processes of sequestration-stabilization of organic carbon takes place within the mechanisms of structural-functional integration of soil-specific pedostructural matter at higher hierarchical levels: - organo-mineral complexes (‹1 mKm) in the composition of which the humus is stably sequestered by the formation of compounds with clay minerals and oxides-hydroxides of iron and aluminum; - ultramicroaggregates (‹5 mKm) formed by the association of organo-mineral complexes; - microaggregates (‹0.25 mm) formed by the association of ultramicroaggregates and soil elementary particles. Within these three groups of aggregate formations, the renewal of organic carbon occurs with a periodiciy from 100-300 years. The hierarchical system "macroaggregate" involves 4 subsystems, quantitative, qualitative and functional different by indexes of sequestration and stabilization of organic carbon. 1. 1-0.25 mm aggregates with maximum degree of aggregate stability, moderate-high carbon sequestration capacity, but very high stabilization capacity; 2. 5-1 mm aggregates with maximum sequestration capacity of organic carbon accumulated in the site and high stabilization capacity; 3. 5-10 mm aggregates with moderate organic carbon sequestration capacity and low stabilization capacity; 4. aggregates ›10 mm with minimum carbon sequestration and very low carbon stabilization capacity.