TY - JOUR
T1 - Are nitrous oxide emissions indirectly fueled by input of terrestrial dissolved organic nitrogen in a large eutrophic Lake Taihu, China?
AU - Zhou, Yongqiang
AU - Xiao, Qitao
AU - Zhou, Lei
AU - Jang, Kyoung Soon
AU - Zhang, Yunlin
AU - Zhang, Mi
AU - Lee, Xuhui
AU - Qin, Boqiang
AU - Brookes, Justin D.
AU - Davidson, Thomas A.
AU - Jeppesen, Erik
PY - 2020
Y1 - 2020
N2 - 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.
AB - 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.
KW - Dissolved organic nitrogen (DON)
KW - Fluorescence
KW - Nitrous oxide (NO)
KW - Parallel factor analysis (PARAFAC)
KW - Ultrahigh resolution mass spectrometry (FT-ICR MS)
UR - http://www.scopus.com/inward/record.url?scp=85081921020&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2020.138005
DO - 10.1016/j.scitotenv.2020.138005
M3 - Journal article
C2 - 32208291
AN - SCOPUS:85081921020
SN - 0048-9697
VL - 722
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 138005
ER -