## 4 Discussion
In fact, several authors have explained low initial cellulase activity by the low growth of cellulolytic fungus at the beginning of composting (Figure 6), which grows further during composting with a consequent increase in cellulose activity [35; 47; 48]; this was confirmed by statistical analyses indicating that the production of cellulase and the concentration of fungi correlated positively (\(p\)-value = 0.975) (Table 4). Several studies have explained that many fungal species, especially those belonging to the Ascomycetes and Basidiomycetes phyla, are known for their ability to degrade lignin, cellulose, or hemicellulose [4; 48].These findings are in agreement with the NGS analysis recorded. Also, it can be suggested that the decreasing C/N ratio during composting allowed greater availability of nutrients and favored the growth of microbial biomass [49]; this assumption was confirmed by statistical analysis showing that the C/N ratio and cellulase activities correlated negatively (\(p\)-value = \(-\)0.366) (Table 4). During the examination of the distribution of microbial species among the taxonomic groups, it is important to consider the phylogenetics-based microbial taxonomy, rather than a set of arbitrary morphological or biochemical characteristics as used in classical taxonomy [50]. In this investigation, the whole genomic DNA of compost samples was analyzed through NGS. NGS analysis indicated that \begin{table}
\begin{tabular}{c c c c} \hline \hline  & **Cellulose** & **Acid Phosphatase** & **Alkaline Phosphatase** \\ \hline C/N ratio & \(-\)0.366 ** & \(-\)0.833 ** & \(-\)0.786 ** \\ Temperature & 0.843 & 0.969 & 0.963 \\ Moisture & \(-\)0.095 & \(-\)0.502 & \(-\)0.396 \\ pH & \(-\)0.53 & \(-\)0.040 & \(-\)0.345 \\ Electricalconductivity & 0.417 & 0.851 ** & 0.792 * \\ Bacteria & 0.788 * & 0.459 & 0.495 \\ Actinomycetes & 0.925 ** & 0.853 ** & 0.941 ** \\ Fungi & 0.975 ** & 0.821 ** & 0.864 ** \\ \hline \hline \end{tabular}  
*: The correlation is significant at the 0.05 level (bilateral); **: The correlation is significant at the 0.01 level (bilateral).  
\end{table} 
Table 4: Significant Pearson correlation coefficients between enzymatic activities and biotic and abiotic factors. compost B harbored a wealth of different microbial species, which means that the compost was an ideal habitat for various microbial life forms [10]. This richness could be owing to the wide range of organic matter present in the feedstock. It is known that the fungal kingdom contains a wide range of fungal species that can degrade cellulose [51], especially those belonging to phyla like Basidiomycota and Ascomycota. In fact, among the cellulolytic fungi, representatives of the _Aspergillus_ genus (_A. aculeatus_) which contain genes for the production of cellulase and xylanase have been found [52]. In addition, other species belonging to _Trichoderma (T. longbrachiatum_) and _Humicola insolens_ have the ability to produce at least two exoglucanases (CBHI and CBHI), five endoglucanases (EGI, EGII, EGII, EGIV, and EGV), and two glucosidases (BCLI and BGLII) [52]. Moreover, several authors have demonstrated that there are many other species that produce different types of cellulases to degrade cellulose; among them are _Oxysporus sp_, _Rhizopus oryzae_, _Candida pelliculosa_ var. _acetherius_, _Kluyveromyces lactis, Pichia pastoris, Hansenula polymorpha, Yarrowia lipolytica, Leutotus ostreatus, Phanerozoate_ (_Pchrysosporium_), _Penicillium_ (_P.janthinellum_ and _P.chrysosporium_), _Lentinus edodes_, _Trametes versicolor_, _Schizophyllum, Saccharomyces cerevisiae_, and _Fusarium oxysporum_[7; 53; 54; 55; 56]. Additionally, among the marginally represented bacterial community members in the compost samples associated with the ability to produce enzymes capable of degrading cellulose, colonize substrates under conditions of low nutrient availability, and solubilize lignin were those belonging to the family of phyla including Proteobacteria, Bacteroidetes, Actinobacteria, and Firmicutes (Figure 10) [57].