SPATIAL DISTRIBUTION OF SEDIMENT NUTRIENTS IN A WETLAND WITH RECLAIMED WATER SUPPLEMENT

WANG Chengwen; ZHANG Yong; ZHANG Jiaxin; ZHANG Hui

doi:10.13205/j.hjgc.202301011

Volume 41 Issue 1

Jan. 2023

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WANG Chengwen, ZHANG Yong, ZHANG Jiaxin, ZHANG Hui. SPATIAL DISTRIBUTION OF SEDIMENT NUTRIENTS IN A WETLAND WITH RECLAIMED WATER SUPPLEMENT[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(1): 87-92,104. doi: 10.13205/j.hjgc.202301011

Citation:

WANG Chengwen, ZHANG Yong, ZHANG Jiaxin, ZHANG Hui. SPATIAL DISTRIBUTION OF SEDIMENT NUTRIENTS IN A WETLAND WITH RECLAIMED WATER SUPPLEMENT[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(1): 87-92,104. doi: 10.13205/j.hjgc.202301011

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SPATIAL DISTRIBUTION OF SEDIMENT NUTRIENTS IN A WETLAND WITH RECLAIMED WATER SUPPLEMENT

doi: 10.13205/j.hjgc.202301011

1. School of Environment, Beijing Normal University, Beijing 100875, China;
2. Beijing Shunyi Hanshiqiao Wetland Nature Reserve Management Center, Beijing 101309, China;
3. College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China

Received Date: 2022-10-01
Available Online: 2023-03-23

Abstract

Abstract

To reveal the impact of reclaimed water supplement on the spatial distribution characteristics of nutrients in Hanshiqiao wetland sediments, 25 samples of surface sediments and 3 samples of core sediments were collected to explore the spatial and vertical distribution characteristics and stoichiometric characteristics of total organic matter (OM), total nitrogen (TN) and total phosphorus (TP). The results showed that:the average OM, TN and TP contents in the surface sediments in Hanshiqiao wetland were 70.65, 4.72, 0.96 g/kg, respectively, which were significantly higher than those in other wetlands. The contents of OM and TN were higher in the midstream and downstream than that in the upstream, while TP was evenly distributed in the whole wetland. In vertical direction, the content of OM, TN, and TP was the highest in the surface layer of sediment (0~10 cm), and showed a tendency of decreasing first and then gradually stabilizing with the increase of sediment profile depth, indicating the risk of C, N, P in surface sediment releasing to the overlying water. Stoichiometric characteristics indicated that there were significant positive correlations between OM, TN and TP in surface sediments (P<0.01). The comprehensive pollution evaluation and organic pollution evaluation showed that the whole wetland was in moderate to severe pollution level. The reclaimed water supplement intensified the accumulation of nutrients in the wetland sediments. The spatial distribution of nutrients in the wetland sediments was affected by the residual concentration of nutrients in the recharge water, hydrodynamic conditions and the wetland topographic features. In the areas with slow water flow and mostly stagnant water, the nutrient content in the sediments increased significantly. The replenishment of reclaimed water was an important driving force for wetland eutrophication.
- reclaimed water,
- Hanshiqiao Wetland,
- sediments,
- nutrient,
- pollution assessment

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References(21)

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