Table 1.

Physico-chemical characteristics (mean value ± sd) of water in Hongze Lake during three water periods.

Water Periods	Regions	Temperature °C	Water Depth (m)	Transparency (cm)	Total Phosphorus (mg/L)	Total Nitrogen (mg/L)	Chlorophyll a (μg/L)	pH	Dissolved Oxygen (mg/L)	Conductivity μS/cm
mid-water	Eastern	9.60 ± 0.66	3.04 ± 0.60	27.80 ± 7.92	0.046 ± 0.019	2.089 ± 0.383	18.549 ± 6.560	8.59 ± 0.37	12.620 ± 0.525	446.62 ± 16.73
	Northern	10.98 ± 0.22	2.85 ± 0.13	26.75 ± 5.19	0.050 ± 0.013	1.183 ± 0.166	30.340 ± 19.374	8.85 ± 0.24	12.713 ± 1.248	512.25 ± 36.56
	Southern	10.33 ± 0.45	2.63 ± 0.67	56.67 ± 11.93	0.034 ± 0.004	1.928 ± 0.615	12.169 ± 2.054	8.89 ± 0.03	13.017 ± 0.116	427.33 ± 33.41
	Western	9.27 ± 0.56	2.50 ± 0.10	22.80 ± 11.28	0.070 ± 0.027	1.384 ± 0.300	22.693 ± 11.163	7.79 ± 0.76	13.323 ± 0.171	511.75 ± 58.84
low-water	Eastern	30.64 ± 1.17	2.10 ± 0.27	13.25 ± 4.65	0.315 ± 0.492	2.379 ± 0.576	35.323 ± 9.081	9.39 ± 0.27	8.215 ± 1.344	706.13 ± 116.00
	Northern	30.40 ± 1.47	2.02 ± 0.27	16.15 ± 2.61	0.112 ± 0.033	2.113 ± 1.243	74.740 ± 22.375	8.32 ± 0.48	9.861 ± 1.601	742.85 ± 33.17
	Southern	32.30 ± 0.52	2.23 ± 0.78	20.00 ± 4.58	0.123 ± 0.036	2.396 ± 0.767	33.876 ± 22.507	9.07 ± 0.17	8.540 ± 2.691	583.00 ± 45.43
	Western	30.06 ± 2.22	1.91 ± 0.21	19.50 ± 5.67	0.142 ± 0.047	1.503 ± 0.501	59.595 ± 33.098	7.89 ± 1.38	9.466 ± 2.319	943.64 ± 132.57
high-water	Eastern	11.40 ± 1.36	3.20 ± 0.08	22.25 ± 12.69	0.166 ± 0.064	2.647 ± 1.148	6.907 ± 1.846	10.90 ± 1.10	12.758 ± 1.159	342.40 ± 83.25
	Northern	10.40 ± 0.21	2.82 ± 0.96	17.10 ± 4.91	0.089 ± 0.028	1.769 ± 0.632	7.624 ± 3.392	9.40 ± 1.43	13.349 ± 0.653	494.29 ± 85.34
	Southern	12.00 ± 0.71	3.35 ± 1.06	31.00 ± 4.24	0.105 ± 0.006	2.716 ± 0.270	2.631 ± 0.570	9.32 ± 0.70	12.555 ± 0.205	390.65 ± 34.30
	Western	10.91 ± 0.91	2.87 ± 0.38	17.11 ± 4.96	0.142 ± 0.071	2.168 ± 0.613	5.673 ± 3.316	10.33 ± 1.19	13.030 ± 0.780	438.70 ± 128.46