Open Access
Table 2
Zoning of 3DEEM
| Region | Organic type |  / nm |
 / nm |
|---|---|---|---|
| Ⅰ | Tyrosine protein | 220-250 | 260-330 |
| Ⅱ | Tryptophan protein | 220-250 | 330-380 |
| Ⅲ | Fulvic acids | 220-250 | 380-550 |
| Ⅳ | Soluble microbial metabolites | 250-380 | 260-380 |
| Ⅴ | Humic acid humus | 250-500 | 380-550 |
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