Table 1.
Total organic carbon contents of some segments in different years (percent)
| Shihaoxian | Hadawan | Songhuajiang village | |
|---|---|---|---|
| 1973 | 1.835 | 16.946 | – |
| 1983 | – | – | 26.764 |
| 2003 | 1.798 | 17.243 | 26.568 |
| 2006 | 1.867 | 16.468 | 27.000 |
– no data
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