2011—2020年呼伦湖水质及富营养化变化分析

doi:10.13866/j.azr.2021.06.05

Abstract

Abstract:

In this study, Hulun Lake was taken as the research object, and water quality indicators measured in a long time series from 2011 to 2020 were selected. Interannual variations in Salinity (S), Electrical Conductivity (EC), Total Dissolved Solids (TDS), pH, Transparency (SD), Chlorophyll a (Chl.a), Dissolved Oxygen (DO), Chemical Oxygen Demand (COD), Total Nitrogen (TN), and Total Phosphorus (TP) were analyzed. The water quality and eutrophication degree of Hulun Lake from 2011 to 2020 were evaluated on the basis of the gray pattern recognition model and comprehensive nutrient state index. Combined with the actual situation of Hulun Lake, the water quality and eutrophication degree of Hulun Lake were examined from two aspects of external input and meteorological conditions. Results showed that S, TDS, and EC decreased from 2011 to 2020, and water salinity improved. pH was between 8.86 and 9.37, and water was weakly alkaline. TN and COD decreased, but TP did not. Grey Pattern Composite Index (GC) indicated that the best water quality of the decade was observed in 2012, and the worst water quality was documented in 2011. Overall, GC decreased from 4.01 in 2011 to 3.35 in 2020, indicating that water quality improved. Comprehensive Nutritional Status Index (TLI) implied that water underwent moderate eutrophication, severe eutrophication, and another moderate eutrophication from 2011 to 2020. TLI initially increased and subsequently decreased; in particular, it increased from 61.837 in 2011 to 71. 815 in 2016 and then decreased to 61.535 in 2020. Wind speed and water depth were the driving factors of eutrophication in Hulun Lake. At present, the main pollution in Hulun Lake is caused by nitrogen, phosphorus, and organic pollutants. The water quality of Hulun Lake can be enhanced by implementing effective measures, such as controlling the discharge of upstream sewage, strictly regulating the balance of grass and graziery, and improving the quality of water supply.

Key words: Hulun Lake, eutrophication, grey model, integrated nutritional status index method

YU Haifeng,SHI Xiaohong,SUN Biao,ZHAO Shengnan,LIU Yu,ZHAO Meili. Analysis of water quality and eutrophication changes in Hulun Lake from 2011 to 2020[J].Arid Zone Research, 2021, 38(6): 1534-1545.

Figures/Tables 10

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References 28

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参数	Chl.a	TP	TN	SD
r_ij	1	0.84	0.82	-0.83
r_ij²	1	0.7056	0.6724	0.6889

年份	水质级别
年份	Ⅰ类	Ⅱ类	Ⅲ类	Ⅳ类	Ⅴ类
2011	0.2455	0.1190	0.0305	0.0458	0.0278
2012	0.1665	0.1263	0.0282	0.0781	0.0805
2013	0.1594	0.1660	0.0610	0.0223	0.0638
2014	0.2449	0.1089	0.0213	0.0795	0.0415
2015	0.2500	0.1157	0.0284	0.0458	0.0278
2016	0.2500	0.1157	0.0284	0.0458	0.0278
2017	0.2500	0.1157	0.0284	0.0458	0.0278
2018	0.2500	0.1157	0.0284	0.0458	0.0278
2019	0.0632	0.1398	0.1973	0.0099	0.0793
2020	0.2437	0.1073	0.0213	0.0882	0.0443

年份	TLI(Chl.a)	TLI(TP)	TLI(TN)	TLI(SD)	TLI(Σ)	营养状态
2011	37.749	69.802	68.909	81.743	61.837	中度富营养
2012	48.321	60.681	66.362	77.199	61.607	中度富营养
2013	43.745	64.437	67.866	77.837	61.452	中度富营养
2014	37.101	82.332	64.888	80.690	63.391	中度富营养
2015	50.054	72.340	68.334	79.757	65.861	中度富营养
2016	43.519	86.198	93.172	77.313	71.815	重度富营养
2017	53.865	79.571	86.139	73.053	71.165	重度富营养
2018	54.379	69.894	79.746	76.036	68.375	中度富营养
2019	55.209	64.039	87.591	76.198	69.055	中度富营养
2020	47.262	73.131	64.568	67.415	61.535	中度富营养

	DO	COD	TN	TP	H	SD	pH	S	Chl.a	N/P	P	WS	GC	TLI
DO	1
COD	-0.020	1
TN	-0.073	0.332	1
TP	0.456	0.076	0.513	1
H	0.372	-0.379	0.557	0.548	1
SD	0.375	-0.198	0.043	0.020	0.508	1
pH	-0.510	-0.240	0.313	-0.369	0.160	-0.248	1
S	-0.070	0.635^*	0.347	0.401	-0.262	-0.230	-0.436	1
Chl.a	-0.055	-0.202	0.387	-0.308	0.496	0.316	0.746^*	-0.611	1
N/P	-0.660^*	0.162	0.561	-0.331	0.158	-0.003	0.765^**	-0.162	0.694^*	1
P	-0.321	-0.461	-0.169	-0.465	0.230	0.585	0.181	-0.577	0.416	0.395	1
WS	0.096	0.087	0.812^**	0.364	0.602	0.327	0.284	0.119	0.532	0.426	-0.052	1
GC	-0.058	0.273	0.500	0.076	0.085	-0.323	0.220	0.121	0.286	0.340	-0.123	0.238	1
TLI	0.136	0.100	0.906^**	0.516	0.715^*	0.024	0.426	0.025	0.576	0.473	-0.168	0.798^**	0.558	1

Analysis of water quality and eutrophication changes in Hulun Lake from 2011 to 2020

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