Study on ecological environmental effects of sediment dredging: A case study on river regulation in Shandong Province

doi:10.3969/j.issn.1000-5641.2022.03.007

Abstract

Abstract:

In this study, follow-up monitoring over the course of two and a half years was carried out to analyze the long-term impact of sediment dredging on water quality, new sediments, benthos, and microorganisms of a river reach in Shandong Province. The results showed that the contents of COD_Cr and TP could be effectively removed by dredging, but little effect was observed on the contents of TN and NH₄⁺-N. The C/N ratio in the new sediments decreased gradually over the observation period, which was beneficial to the recovery of microbial and benthic communities. Dredging can reduce the average biomass and density of tremididae in surface sediments to a certain extent, while Chironomidae density is less affected by dredging. Dredging did not change the microbial community structure significantly, which may be related to the depth of dredging. Exogenous pollutants and man-made drainage can affect the water quality and sediment pollutant content of the dredged river section; this effect, however, may recover in a short time after completion of the microbial community construction. In conclusion, the overall engineering effects of dredging were observed during the study period (2–4 years after dredging); in this time, the water quality and sediment pollution improved, which was conducive to the restoration of benthos and microbial diversity. However, with the passage of time and human interference, the net effect on water quality maintenance weakened.

Key words: sediment dredging, water quality, sediment, benthos, microbial diversity

CLC Number:

X522

Chunyi YANG, Guangxiang MA, Junjie GU, Jiayan GU, Guofu HE, Weixin KONG, Gensen YANG. Study on ecological environmental effects of sediment dredging: A case study on river regulation in Shandong Province[J]. Journal of East China Normal University(Natural Science), 2022, 2022(3): 61-70.

Figures/Tables 7

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采样时间	底栖生物 (主要种类)	平均密度/(ind·m^–2)		平均生物量/(g·m^–2)
采样时间	底栖生物 (主要种类)	疏浚区	未疏浚区	疏浚区	未疏浚区
2017年11月	颤蚓科	0	23.11	0	0.0708
	摇蚊科	10.67	8.89	0.5223	0.0468
	其他(大蜻科)	5.33	0	23.4117	0
2018年6月	颤蚓科	0	9.60	0	0.0499
	摇蚊科	42.67	51.20	1.1728	0.3483
	其他	0	0	0	0
2018年11月	颤蚓科	0	0	0	0
	摇蚊科	5.33	0	0.0075	0
	其他	0	0	0	0
2019年6月	颤蚓科	0	14.40	0	0.0580
	摇蚊科	8.00	105.60	0.0464	0.9885
	其他	0	4.80	0	0.0378
2019年11月	颤蚓科	58.67	0	0.2101	0
	摇蚊科	32.00	18.00	0.4080	0.1412
	其他	5.33	2.00	0.0149	0.0056

采样时间	区域	Simpson指数	Shannon指数	ACE指数	Chao1指数
2017年11月	未疏浚区	0.9968	10.01	2156.00	2156.00
2017年11月	疏浚区	0.9961	9.86	2036.00	2036.00
2018年6月	未疏浚区	0.9878	8.52	1473.00	1473.00
2018年6月	疏浚区	0.9922	9.36	1836.00	1836.00
2018年11月	未疏浚区	0.8936	7.44	2120.27	2097.97
2018年11月	疏浚区	0.9971	10.17	2401.49	2399.02
2019年6月	未疏浚区	0.9966	9.64	2467.78	2334.05
2019年6月	疏浚区	0.9970	10.00	3242.77	2996.83
2019年11月	未疏浚区	0.9968	10.03	3246.37	3016.87
2019年11月	疏浚区	0.9969	10.05	3175.80	2984.64

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