Community 2 Community 1 Oxic zone- Photic zone- Chemoorganotrophic cyanobacteria and algae bacteria 6C02+6HO ceH1206+602- 6 CO2+6H2O C6H1206+60 Sediments Anoxic zone
Community 3 1. Guild 1: methanogenic bacteria(C02-+CH4) homoacetogenic bacteria(CO,-> acetate) 2. Guild 2: sulfate-reducing bacteria (SO4 -+H2S) sulfur-reducing bacteria(S-+H2S) 3. Guild 3: denitrifying bacteria(NO3-+ N2) ferric iron-reducing bacteria(Fe-+Fe 4. Guild 4: fermentative bacteria (fermenting sugars amino and fatty acids, and so on) Community 3 Sediments
Community 3
The distribution of microorganisms in nature ecosystem depends on the resources(nutrients) available and on the growth conditions Temperature, pH, water availability, light, oxygen of a habitat define the niche for each particular microorganism
The distribution of microorganisms in nature ecosystem depends on the resources (nutrients) available and on the growth conditions. Temperature, pH, water availability, light, oxygen of a habitat define the niche for each particular microorganism
A soil aggregate composed Micro- of mineral and organic colony Quartz components, showing that localization of soil microbes Air Organic Very few microorganisms matte 最 Quart are found free in the soil Quar solution: most of them occur as microcolonies Clay particle attached to the soil particles
A soil aggregate composed of mineral and organic components, showing that localization of soil microbes. Very few microorganisms are found free in the soil solution; most of them occur as microcolonies attached to the soil particles
10.1.2 Terrestrial Environments Proportion of different soil microorganisms in soil Othe organisms 0.2% Fungi% Aerobic bacteria Actinomycetes 70 13% Figure 25.12 The rela- Anaerobic tive proportions of various bacteria kinds of organisms found in 14% soil. "Other organisms"include such things as algae, protists, and viruses
Proportion of different soil microorganisms in soil 10.1.2 Terrestrial Environments