广东沿海红树林区水质变化特征与富营养状态评估

doi:10.11978/2021111

Journal of Tropical Oceanography ›› 2022, Vol. 41 ›› Issue (6): 1-11.doi: 10.11978/2021111CSTR: 32234.14.2021111

• Special Column: Mangrove Forest • Next Articles

Characteristics of water quality and their eutrophication assessment on the mangrove ecosystems along the Guangdong coast

INYANG Aniefiok Ini¹^,²^,³^,⁴^,⁵(), ZHOU Yueyue¹^,²^,³^,⁴^,⁵, WANG Youshao¹^,²^,³^,⁵()

1. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China
2. Daya Bay Marine Biology Research Station, Chinese Academy of Sciences, Shenzhen 518121, China
3. Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China
4. University of Chinese Academy of Sciences, Beijing 100049, China
5. Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China

Received:2021-08-28 Revised:2022-10-19 Online:2022-11-10 Published:2021-10-20
Contact: WANG Youshao E-mail:yswang@scsio.ac.cn;aniefiokinyang@yahoo.com
Supported by:
National Key Research and Development Plan(2017FY100700);National Natural Science Foundation of China(U1901211);National Natural Science Foundation of China(41876126);International Partnership Program of Chinese Academy of Sciences(133244KYSB20180012);Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)(GML2019ZD0305);Strategic Priority Research Program of the Chinese Academy of Sciences(XDA23050200)

Abstract

Abstract:

It was investigated for the spatio-temporal variation of the water quality in the mangroves in Guangdong Province. Surface water samples were collected inside the mangroves from 30 sites during the dry season (Oct., 2017 to Jan., 2018) and 20 sites during the wet season (July to Aug., 2018). Water quality and trophic conditions were highlighted by the single trophic state index (TSI Chl a), and the evaluation standard was: 0<TSI≤30 oligotrophic, 30<TSI≤50 mesotrophic, TSI>50 eutrophic, and >70 high eutrophic. The spatio-temporal variations of the environmental variables were as follows: salinity (2.15‰~27.14‰), pH (6.18~8.65), electrical conductivity (10.87~90.52 µs·cm^-1), turbidity (5.6~272 FTU), nitrate (0~127.2 mg·L^-1), nitrite (0~12.0 mg·L^-1), phosphate (0~34.5 mg·L^-1), silicate (1.22~2.88 mg·L^-1) and Chlorophyll a (0.19~38.08 mg·m^-3). Cluster analysis deduced that the water quality across the right side of the Leizhou Peninsula to the east Guangdong coast during the wet season was relatively better, while the left side experienced mesotrophic conditions. Meanwhile the water quality decreased in the dry season, ranging from high mesotrophic conditions around the Leizhou Peninsula to eutrophic conditions across the east coast. The PCA revealed that nutrient salts, salinity, pH, EC and turbidity contributed significantly to the water quality status in the mangrove ecosystems, which in turn affects the algal communities in the ecosystem.

Key words: algal abundance, nutrients, mangroves, trophic states, Guangdong coast

CLC Number:

INYANG Aniefiok Ini, ZHOU Yueyue, WANG Youshao. Characteristics of water quality and their eutrophication assessment on the mangrove ecosystems along the Guangdong coast[J].Journal of Tropical Oceanography, 2022, 41(6): 1-11.

Figures/Tables 10

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Tab. 2

Fig. 3

variables	season	minimum	maximum	mean	STD	T-test	dry vs wet
pH	dry	7.23	8.63	7.95	0.338	not sign.	P<0.05
pH	wet	7.47	8.71	8.04	0.393	not sign.	P<0.05
temperature/℃	dry	13.33	29.79	20.37	3.946	sign.	P<0.01
temperature/℃	wet	23.76	34.49	30.09	2.447	sign.	P<0.01
EC/ (µS·cm^-1)	dry	10.87	90.52	33.21	14.76	sign.	P<0.01
EC/ (µS·cm^-1)	wet	1338	9702	3745	1966	sign.	P<0.01
TDS /(mg·L^-1)	dry	0.098	21.61	14.67	5.957	sign.	P<0.01
TDS /(mg·L^-1)	wet	2.042	18.14	10.44	5.892	sign.	P<0.01
turbidity /FTU	dry	5.6	395	82.91	94.67	not sign.	P<0.05
turbidity /FTU	wet	9.2	204	59.261	41.23	not sign.	P<0.05
salinity/‰	dry	5.11	27.31	18.78	7.019	sign.	P<0.01
salinity/‰	wet	2.15	22.82	12.67	7.538	sign.	P<0.01
nitrate /(mg·L^-1)	dry	3.5	127.2	50.923	40.76	sign.	P<0.01
nitrate /(mg·L^-1)	wet	0	2.0	0.13	0.458	sign.	P<0.01
nitrite/ (mg·L^-1)	dry	0.6	12.0	3.59	2.59	sign.	P<0.01
nitrite/ (mg·L^-1)	wet	0	1.5	0.109	0.368	sign.	P<0.01
phosphate/ (mg·L^-1)	dry	0.13	34.5	9.45	8.35	sign.	P<0.01
phosphate/ (mg·L^-1)	wet	0	2.5	0.997	1.042	sign.	P<0.01
silicate /( mg·L^-1)	dry	0.884	2.882	1.814	0.533	sign.	P<0.01
silicate /( mg·L^-1)	wet	1.54	3.04	2.25	0.368	sign.	P<0.01
Chl a/ (mg·m^-3)	dry	0.752	38.084	8.38	8.778	sign.	P<0.01
Chl a/ (mg·m^-3)	wet	0.137	13.526	1.804	2.794	sign.	P<0.01
TSI	dry	21.9	64.53	43.312	10.76	sign.	P<0.01
TSI	wet	3.65	53.27	25.11	11.17	sign.	P<0.01
algal density (cells·L^-1)	dry	558	23703	3881	4493	sign.	P<0.01
algal density (cells·L^-1)	wet	1395	70144	9826	13757	sign.	P<0.01

		pH	temperature	EC	TDS	turbidity	salinity	nitrate	nitrite	phosphate	silicate	Chl a	TSI (Chl a)	algal density
dry season	pH	1.000
	temperature	-0.602**	1.000
	EC	0.439*	-0.336	1.000
	TDS	0.443*	-0.259	0.361*	1.000
	turbidity	-0.122	0.299	-0.358*	-0.349	1.00
	salinity	0.458**	-0.263	0.342	0.959**	-0.361*	1.000
	nitrate	0.431*	-0.264	0.413*	-0.090	0.179	-0.119	1.000
	nitrite	0.512**	-0.331	-0.013	-0.019	0.077	-0.022	0.505**	1.000
	phosphate	0.204	-0.397*	0.077	-0.180	0.042	-0.243	0.420*	0.154	1.000
	silicate	-0.206	0.300	0.133	-0.006	0.181	0.110	-0.012	-0.063	-0.355	1.000
	Chl a	0.530**	-0.303	0.093	0.185	0.273	0.182	0.601**	0.359*	0.213	-0.095	1.000
	TSI (Chl a)	0.513**	-0.318	0.231	0.266	-0.119	0.273	0.469**	0.399*	0.062	-0.105	0.838**	1.000
	algal density	0.267	-0.055	0.108	-0.055	-0.071	-0.099	0.379*	0.498**	0.141	0.099	-0.077	-0.062	1.000
wet season	pH	1.000
	temperature	-0.237	1.000
	EC	-0.576**	0.206	1.000
	TDS	0.534**	0.111	-0.466*	1.000
	turbidity	0.0851	0.135	-0.125	0.078	1.000
	salinity	0.527**	0.104	-0.457*	1.000**	0.0701	1.000
	nitrate	-0.321	0.228	0.733**	-0.308	-0.085	-0.310	1.000
	nitrite	-0.323	0.240	0.725**	-0.325	-0.074	-0.327	0.992**	1.000
	phosphate	-0.031	-0.097	0.044	0.031	0.134	0.035	0.075	0.045	1.000
	silicate	-0.097	-0.213	0.317	-0.276	-0.055	-0.273	0.340	0.381	0.208	1.000
	Chl a	0.140	0.006	-0.156	0.140	0.110	0.135	-0.063	-0.068	-0.076	-0.133	1.000
	TSI (Chl a)	0.064	0.159	-0.019	0.193	0.178	0.192	0.049	0.044	-0.074	-0.098	0.799**	1.000
	algal density	0.194	0.065	-0.042	0.245	-0.021	0.250	-0.067	-0.073	0.305	-0.444*	-0.144	-0.153	1.000

Characteristics of water quality and their eutrophication assessment on the mangrove ecosystems along the Guangdong coast

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