Effects of nitrogen input on N2O production and enzyme activity in Luoshijiang Wetland sediments, China
We examined the effects of nitrate (NO3--N) and ammonium (NH4+-N) input at different concentrations (0, 1, 5 and 25 mg·kg-1) on N2O production rate from the surface sediment (0-5 cm) of Luoshijiang Wetland, located upstream from Lake Erhai. The contribution of nitrification, denitrification, nitrifier denitrification, and other factors to the N2O production rate in sediments was studied by the inhibitor method. The relationships between N2O production and the activities of hydroxylamine (HyR), nitrate (NAR), nitric oxide (NOR), and nitrous oxide (NOS) reductases in sediments were analyzed. We found that NO3--N input significantly increased total N2O production rate (1.51-11.35 nmol·kg-1·h-1), which led to N2O release, whereas NH4+-N input decreased that (-0.80 to -0.54 nmol·kg-1·h-1), causing N2O absorption. NO3--N input did not change the dominant roles of nitrification and nitrifier denitrification in N2O production in sediments, but increased the contributions of these two factors to 69.5% and 56.5%, respectively. The NH4+-N input significantly changed N2O gene-ration process, and the nitrification and nitrifier denitrification changed from N2O release to uptake. There was a positive correlation between total N2O production rate and NO3--N input. NO3--N input significantly increased NOR activity and decreased NOS activity, thereby promoting N2O production. The total N2O production rate in sediments was negatively correlated with NH4+-N input. NH4+-N input significantly increased the activities of HyR and NOR, decreased NAR activity, and inhibited N2O production. Nitrogen inputs with different forms and concentrations changed the degree of contribution and mode of N2O production by affecting enzyme activities in sediments. NO3--N input significantly promoted N2O production, acting as a source of N2O, while NH4+-N input inhibited N2O production, resulting in an N2O sink.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:34 |
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| Enthalten in: |
Ying yong sheng tai xue bao = The journal of applied ecology - 34(2023), 2 vom: 01. Feb., Seite 405-414 |
| Sprache: |
Chinesisch |
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| Weiterer Titel: |
氮输入对罗时江湿地沉积物N2O生成过程及酶活性的影响 |
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| Beteiligte Personen: |
Li, Jiachen [VerfasserIn] |
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| Links: |
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| Themen: |
31C4KY9ESH |
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| Anmerkungen: |
Date Completed 23.02.2023 Date Revised 23.02.2023 published: Print Citation Status MEDLINE |
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| doi: |
10.13287/j.1001-9332.202302.012 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| 245 | 1 | 0 | |a Effects of nitrogen input on N2O production and enzyme activity in Luoshijiang Wetland sediments, China |
| 246 | 3 | 3 | |a 氮输入对罗时江湿地沉积物N2O生成过程及酶活性的影响 |
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| 520 | |a We examined the effects of nitrate (NO3--N) and ammonium (NH4+-N) input at different concentrations (0, 1, 5 and 25 mg·kg-1) on N2O production rate from the surface sediment (0-5 cm) of Luoshijiang Wetland, located upstream from Lake Erhai. The contribution of nitrification, denitrification, nitrifier denitrification, and other factors to the N2O production rate in sediments was studied by the inhibitor method. The relationships between N2O production and the activities of hydroxylamine (HyR), nitrate (NAR), nitric oxide (NOR), and nitrous oxide (NOS) reductases in sediments were analyzed. We found that NO3--N input significantly increased total N2O production rate (1.51-11.35 nmol·kg-1·h-1), which led to N2O release, whereas NH4+-N input decreased that (-0.80 to -0.54 nmol·kg-1·h-1), causing N2O absorption. NO3--N input did not change the dominant roles of nitrification and nitrifier denitrification in N2O production in sediments, but increased the contributions of these two factors to 69.5% and 56.5%, respectively. The NH4+-N input significantly changed N2O gene-ration process, and the nitrification and nitrifier denitrification changed from N2O release to uptake. There was a positive correlation between total N2O production rate and NO3--N input. NO3--N input significantly increased NOR activity and decreased NOS activity, thereby promoting N2O production. The total N2O production rate in sediments was negatively correlated with NH4+-N input. NH4+-N input significantly increased the activities of HyR and NOR, decreased NAR activity, and inhibited N2O production. Nitrogen inputs with different forms and concentrations changed the degree of contribution and mode of N2O production by affecting enzyme activities in sediments. NO3--N input significantly promoted N2O production, acting as a source of N2O, while NH4+-N input inhibited N2O production, resulting in an N2O sink | ||
| 650 | 4 | |a English Abstract | |
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| 700 | 1 | |a Wang, Yanxia |e verfasserin |4 aut | |
| 700 | 1 | |a Liang, Qibin |e verfasserin |4 aut | |
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