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Lakes actively transform nitrogen (N) and emit disproportionately large amounts of NO relative to their surface area. Studies have investigated the relative importance of denitrification or nitrification on NO emissions; however, the linkage between NO 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 NO emissions from Lake Taihu, China. In the northwestern part of the lake, large riverine inflow and high NO emissions occur in all seasons (24.6 ± 25.2 μmol m d), 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 NH-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 NO production. Twenty days laboratory experiments indicated greater NO production in the northwest inflow samples (NO on day 20: 120.9 nmol L and 17.3 nmol L for bio- and photo-degradation samples, respectively) compared with the central lake samples (NO on day 20: 20.3 nmol L and 12.3 nmol L 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 NH-N and thereafter NO-N. Our results collectively suggest that terrestrial DON fueled ammonification, enhanced nitrification and incomplete denitrification, and thereby became an important contributor to the NO efflux from Lake Taihu.
This article was published in the following journal.
Name: The Science of the total environment
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Nitrogen oxide (N2O). A colorless, odorless gas that is used as an anesthetic and analgesic. High concentrations cause a narcotic effect and may replace oxygen, causing death by asphyxia. It is also used as a food aerosol in the preparation of whipping cream.
A neuropathy due to VITAMIN B 12 DEFICIENCY or to excessive NITROUS OXIDE inhalation. It is associated with overproduction of the myelinolytic TUMOR NECROSIS FACTOR-ALPHA.
A nonflammable, halogenated, hydrocarbon anesthetic that provides relatively rapid induction with little or no excitement. Analgesia may not be adequate. NITROUS OXIDE is often given concomitantly. Because halothane may not produce sufficient muscle relaxation, supplemental neuromuscular blocking agents may be required. (From AMA Drug Evaluations Annual, 1994, p178)
Nitrous acid (HNO2). A weak acid that exists only in solution. It can form water-soluble nitrites and stable esters. (From Merck Index, 11th ed)
An inhalation anesthetic. Currently, methoxyflurane is rarely used for surgical, obstetric, or dental anesthesia. If so employed, it should be administered with NITROUS OXIDE to achieve a relatively light level of anesthesia, and a neuromuscular blocking agent given concurrently to obtain the desired degree of muscular relaxation. (From AMA Drug Evaluations Annual, 1994, p180)