Figure 1
Figure 2
Microbial counts and soil respiration in Rendzic Leptosols from Visterna - Babadag Plateau
| Horizon/ | Fungal counts | Bacterial counts | Soil respiration potential |
|---|---|---|---|
| Depth (cm) | (x 103cfu x g-1 dry soil) | (x 106 viable cells x g-1 dry soil) | (mg CO2 x 100 g-1 soil) |
| Ol (5-0) | 149.880b* | 414.733c | 170.804a |
| Am1 (0-5) | 220.154a | 4529.007a | 146.418b |
| Am2 (5-20) | 48.993d | 3996.211b | 114.823d |
| Amq1(20-35) | 60.514c | 3.804d | 127.122c |
Ecosystem services carried out by microbial communities in Rendzic Leptosols
| Ecosystem services | Microorganisms providing the services |
|---|---|
| Organic matter decomposition and cycling | Bacteria, actinomycetes, fungi, especially belonging to cellulolytic group (e.g. species from genera Cytophaga, Chaetomium, Mortierella, Epicoccum) |
| Improving nutrients availability and uptake | Majority of bacteria, actinomycetes (nitrogen mineralizing species of Streptomyces from Series Griseus), microfungi, ecto or endo-mycorrhizal fungi forming symbioses with trees (e.g. basidiomycetes ) |
| Suppression (inhibition) of plant pathogens | Antagonistic species of bacteria (e.g. Pseudomonas fluorescens), actinomycetes, fungi (e.g. Trichoderma viride, Paecilomyces sp.) |
| Plant growth control | Plant growth promoting microorganisms, mycorrhizal fungi, biocontrol agents (antagonists for pathogens) |
| Improving soil structure and hydrological processes | Bacteria producing exopolysaccharides (pseudomonads), actinomycetes, fungi, (e.g. species from genera Humicola, Trichoderma, Myrothecium, Cladosporium), mycorrhizal fungi, all contributing to formation of soil aggregates |
| Regulation sequestration of gas exchange and carbon | Microorganisms from all groups, mostly from cellulolytic group |
Taxonomic composition of bacterial and fungal communities in litter and Rendzic Leptosols from Babadag plateau (Visterna)
| Horizon/ | Bacterial species | Fungal species | Cellulolytic species |
|---|---|---|---|
| Depth (cm) | (Topping) | (PDA) | (Stapp) |
| Ol | Pseudomonas fluorescens, | Penicillium janthinellum, | Myrothecium catenulatum, |
| (5-0) | Pseudomonas sp., | Absidia corymbifera, Penicillium | Mortierella nana, Chaetomium |
| Bacillus subtilis | sp., | globosum, Chaetomium spirale, | |
| Bacillus megaterium, | Paecilomyces sp. | Mortierella alpina, | |
| Bacillus circulans, | Actinomycetes | ||
| Serratia marcescens | |||
| Actinomycetes Series Albus | |||
| Am1 (0-5) | Pseudomonas fluorescens, Pseudomonas pseudogleyi, | Mortierella minutissima, Cladosporium herbarum, | Cytophaga sp., Chaetomium spirale, Mortierella |
| Bacillus subtilis | Trichoderma viride, Penicillium | minutissima, | |
| Actinomycetes Series Fuscus | nigricans, | Stysanus stemonitis, Mortierella | |
| Fusarium oxysporum | alpina, | ||
| Humicola grisea, | |||
| Epicoccum nigrum, | |||
| Actinomycetes Series Fuscus | |||
| Am2 (5-20) | Pseudomonas fluorescens, Bacillus cereus var. mycoides, | Trichoderma viride, Penicillium nigricans | Mortierella minutissima, Epicoccum nigrum, Mortierella |
| Bacillus subtilis | alpina, | ||
| Verticillium tenerum, | |||
| Mortierella verticillata, Cytophaga | |||
| sp., | |||
| Actinomycetes | |||
| Amq1 (20-35) | Bacillus megaterium, Pseudomonas sp., | Penicillium chrysogenum, Aspegillus fumigatus, Penicillium | Cytophaga sp., Mortierellla verticillata, |
| Pseudomonas fluorescens, | nigricans, Phialophora fastigiata, | Mycelia of basidiomycetes, | |
| Bacillus subtilis | Mortierella minutissima, | Absidia corymbifera, Mortierella | |
| Mycelia of basidiomycetes | minutissima, | ||
| Actinomycetes Series Griseus and | |||
| Albus |