Content of nitrogen and phosphorus and organic carbon in tidal waters of two sampling zonesa.

a Seasonal average valueb S: Shang shoals of Jiuduansha, X: Xia shoals of Jiuduansha.c TOC: total organic carbon. NH3-N: ammonia nitrogen.NO3-N: nitrate nitrogen. TP: total phosphorous.d The results reported for each study zone are the means of the sampling points in the zone. Errors were reported as the standard deviation (SD) of the mean 9 points in each study zone. Different capital letters means the significant difference between S and X at 0.01 level, different lower-case letters means the significant difference between X and S at 0.05 level.Content of nitrogen and phosphorus and organic carbon in tidal waters of two sampling zonesa.