Table 1.
Carbon and nitrogen treatments used in the experimenta
| Carbon treatment | Nitrogen treatment | Glucose (mg C/liter) | Organic nitrogen (mg N/liter) | Inorganic nitrogen (mg N/liter) |
|---|---|---|---|---|
| C-low | OH + IL | 0.5 | 1 | 0.5 |
| OL + IH | 0.5 | 0.5 | 1 | |
| OL + IL | 0.5 | 0.5 | 0.5 | |
| OH + IH | 0.5 | 1 | 1 | |
| C-medium | OH + IL | 10 | 1 | 0.5 |
| OL + IH | 10 | 0.5 | 1 | |
| OL + IL | 10 | 0.5 | 0.5 | |
| OH + IH | 10 | 1 | 1 | |
| C-high | OH + IL | 25 | 1 | 0.5 |
| OL + IH | 25 | 0.5 | 1 | |
| OL + IL | 25 | 0.5 | 0.5 | |
| OH + IH | 25 | 1 | 1 |
a
Organic nitrogen sources consisted of bacterial protein, algal exudate, and humic matter, and nitrate was the source of inorganic nitrogen. Three concentrations of organic carbon, in the form of glucose, were used for each nitrogen treatment. OH, organic nitrogen, high concentration; OL, organic nitrogen, low concentration; IH, inorganic nitrogen, high concentration; IL, inorganic nitrogen, low concentration.