Table 1.

Environmental and biological properties of samples.

Sample	T	DO	pH	Tur	SP	NO3-N	NO2-N	NH4-N	TN	PO4-P	COD	EI	Bac	Algae
AD1-1	18.6	11	9.68	29	36	0.43	0.059	0.231	2.27	<0.01	34.7	55.44	202.95	73.72
AD1-2	18.7	10.9	9.6	28	39	0.46	0.06	0.241	2.85	<0.01	29.30	49.55	241.31	62.34
AD1-3	18.9	10.9	9.71	33	39	0.42	0.058	0.207	3.16	<0.01	26.6	40.42	325.40	56.49
AD2-1	19.1	11.1	10.03	62	69	0.11	0.01	0.393	4.22	<0.01	27.0	30.75	281.66	57.39
AD2-2	19.1	10.7	10.14	53	65	0.13	0.008	0.351	3.46	<0.01	17.0	18.47	192.57	36.17
AD2-3	18.9	10.9	10.17	62	72	0.12	0.009	0.394	4.23	<0.01	21.7	25.22	188.57	46.17
AD3-1	18.1	11.3	9.84	44	51	0.1	0.029	0.27	2.78	<0.01	4.4	3.90	75.75	9.36
AD3-2	18.3	11.1	9.92	45	49	0.1	0.029	0.202	1.99	0.014	16.7	17.20	22.49	35.53
AD3-3	18.5	11.1	9.92	52	53	0.11	0.028	0.299	3.86	<0.01	50.3	48.82	17.78	106.9
AD4-1	19.9	9	10.1	30	34	0.05	<0.003	0.134	1.36	<0.01	4.3	1.77	27.29	9.20
AD4-2	19.1	9.4	10.19	39	39	0.04	<0.003	0.226	2.03	0.011	17.3	11.22	6.79	36.70
AD4-3	18.9	9.5	10.19	40	40	0.06	<0.003	0.247	2.83	<0.01	3.7	2.49	11.25	7.77

T, temperature, °C; DO, dissolved oxygen, mg/L; Tur, turbidity; SP, suspended particle, mg/L; NO₃-N, nitrate nitrogen, mg/L; NO₂-N, nitrite nitrogen, mg/L, < 0.003 is below detectable limit; NH₄-N, ammonia nitrogen, mg/L; TN, total nitrogen, mg/L; PO₄-P, soluble phosphorus, mg/L, < 0.01 is below detectable limit; COD, chemical oxygen demand, mg/L; EI, eutrophication index; Bac, bacterial density, × 10⁸ cells/L; Algae, algal density, × 10⁷ cells/L.