底泥覆盖对氮磷释放及休眠蓝藻复苏的影响

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Abstract To explore the effect of nutrients removal on the recruitment of the dormant cyanobacteria in sediments as well as the mechanism involved, we conducted a microcosm experiment, in which lanthanum modified bentonite and fly ash-based zeolite were used as nitrogen and phosphorus adsorption materials. Specifically, a control group, nitrogen controlling group (capping the surface sediment with fly ash based zeolite), phosphorus controlling group(capping with lanthanum modified bentonite), and a nitrogen and phosphorus double controlling group (capping with fly ash based zeolite mixed with lanthanum modified bentonite) were set up. The results showed that the concentration of phosphorus and ammonia nitrogen in the pore water of the sediments in control group reached 0.732 and 0.044mg/L after 120 days incubation, while were reduced by 97.81% and 65.91% in the phosphorus controlling group and nitrogen controlling group, respectively. This indicated that these treatments inhibited the release of sedimental phosphate or ammonia nitrogen. In contrast, nitrogen and phosphorus double controlling can achieve efficient reduction in both nitrogen and phosphorus release, as the total phosphorus and total nitrogen concentration in the overlying water showed 33.33% and 57.18% reduction in comparison with their initial value. In addition, Capping the sediment increased the relative abundance of denitrification microorganisms (e.g. Thiobacillus, Sulfuricurvum) and nitrate reduction reaction microorganisms (e.g. norank_f_Anaerolineaceae) in the surface sediment. At the end of the experiment, the concentration of chlorophyll a in the control group was 24.36µg/L, which was 16.13, 6.07 and 32.48 times of that in the nitrogen controlling group, phosphorus controlling group, and nitrogen and phosphorus double controlling group, respectively. The relative abundance of cyanophyta in the nitrogen, and nitrogen and phosphorus double controlling group were decreased by 12.24% and 10.16%, respectively. While the relative abundance of diatomata was higher than that in control group, with 2.34 and 2.33 times of the abundance recoded, respectively. This suggested that the phytoplankton diversity was substantially modified.

Key words： lanthanum modified bentonite fly ash-based zeolite cyanobacteria recruitment nitrogen phosphorus

Received: 20 March 2024

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X524

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	YANG Shi-you
	TANG Bing-ran
	LUO Jun-xiao
	LIANG Jia-liang
	HE Qiang
	LI Hong

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YANG Shi-you,TANG Bing-ran,LUO Jun-xiao等. Effects of sediment capping on the nutrients release and recruitment of dormant cyanobacteria[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(11): 6322-6331.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I11/6322

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