Are nitrous oxide emissions indirectly fueled by input of terrestrial dissolved organic nitrogen in a large eutrophic Lake Taihu, China?
2020
Zhou, Yongqiang | Xiao, Qitao | Zhou, Lei | Jang, Kyoung-Soon | Zhang, Yunlin | Zhang, Mi | Lee, Xuhui | Qin, Boqiang | Brookes, Justin D. | Davidson, Thomas A. | Jeppesen, Erik
Lakes actively transform nitrogen (N) and emit disproportionately large amounts of N₂O relative to their surface area. Studies have investigated the relative importance of denitrification or nitrification on N₂O emissions; however, the linkage between N₂O efflux and dissolved organic nitrogen (DON) and carbon (DOC) remains largely unknown. Long-term (2012–2017) seasonal field observations and a series of degradation experiments were used to unravel how DON composition impacts N₂O emissions from Lake Taihu, China. In the northwestern part of the lake, large riverine inflow and high N₂O emissions occur in all seasons (24.6 ± 25.2 μmol m⁻² d⁻¹), coincident with high levels of terrestrial DON and DOC here. The degradation of labile DON and DOC likely enhanced ammonification as supported by the correlations between NH₄⁺-N and DON, DOC, a(350), and terrestrial humic-like C3. The area with large riverine inputs in the northwestern part of the lake was characterized by low DO which may enhance incomplete aerobic nitrification and incomplete denitrification, both leading to N₂O production. Twenty days laboratory experiments indicated greater N₂O production in the northwest inflow samples (N₂O on day 20: 120.9 nmol L⁻¹ and 17.3 nmol L⁻¹ for bio- and photo-degradation samples, respectively) compared with the central lake samples (N₂O on day 20: 20.3 nmol L⁻¹ and 12.3 nmol L⁻¹ for bio- and photo-degradation samples, respectively), despite both having low Chl-a. Our DON and DOC degradation experiments confirmed the occurrence of ammonification along with consumption of NH₄⁺-N and thereafter NO₃⁻-N. Our results collectively suggest that terrestrial DON fueled ammonification, enhanced nitrification and incomplete denitrification, and thereby became an important contributor to the N₂O efflux from Lake Taihu.
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