Sediment nitrogen cycling rates and microbial abundance along a submerged vegetation gradient in a eutrophic lake

The Science of the Total Environment
Lu YaoWenzhi Liu

Abstract

Decline of submerged vegetation is one of the most serious ecological problems in eutrophic lakes worldwide. Although restoration of submerged vegetation is widely assumed to enhance ecological functions (e.g., nitrogen removal) and aquatic biodiversity, the evidence for this assumption is very limited. Here, we investigated the spatio-temporal patterns of sediment potential nitrification, unamended denitrification and N2O production rates along a vegetation gradient in the Lake Honghu, where submerged vegetation was largely restored by prohibiting net-pen aquaculture. We also used five functional genes as markers to quantify the abundance of sediment nitrifying and denitrifying microorganisms. Results showed that unvegetated sediments supported greater nitrification rates than rhizosphere sediments of perennial or seasonal vegetation. However, the absence of submerged vegetation had no significant effect on denitrification and N2O production rates. Additionally, the abundance of functional microorganisms in sediments was not significantly different among vegetation types. Season had a strong effect on both nitrogen cycling processes and microbial abundances. The highest nitrification rates were observed in September, while the...Continue Reading

References

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Jul 11, 2014·Ecotoxicology and Environmental Safety·Zhixiu WangWenzhi Liu
Jul 15, 2016·Ecological Applications : a Publication of the Ecological Society of America·Mary Alldred, Stephen B Baines

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Citations

Oct 12, 2020·The Science of the Total Environment·Haoping WuWei Xing
Jan 27, 2021·Bioresource Technology·Hongliang GuoDuu-Jong Lee
Apr 13, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Zhang DanYuan Xingzhong

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