Basic physical and chemical properties of the sampling zones^a.

a Seasonal average value b S: Shang shoals of Jiuduansha, X: Xia shoals of Jiuduansha. c SOC: soil organic carbon. NH3-N: ammonia nitrogen. AP: available phosphorous. d 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. Errors were reported as the standard deviation (SD) of the mean of 9 points in each study zone. Basic physical and chemical properties of the sampling zonesa.